phd suffix meaning

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[ pee -eych- dee ]

abbreviation for

• the highest degree, a doctorate, awarded by a graduate school in a field of academic study, usually to a person who has completed at least three years of graduate study and a dissertation approved by a committee of professors.
• a person who has been awarded this degree.

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Word history and origins.

Origin of Ph.D. 1

Example Sentences

He had a Ph. D in history and was a college professor before entering politics.

Moses has a Ph. D from Harvard, has published books and lectured widely, and is rare in our nation today.

This kind of reading naturally did not bring me any nearer my Ph. D.

And master's degree and you have completed a good deal of work on a Ph. D.?

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Definition of PhD noun from the Oxford Advanced Learner's Dictionary

• to do/have/be a PhD
• Anne Thomas, PhD
• acquire/​get/​lack (an) education/​training/ (British English) (some) qualifications
• receive/​provide somebody with training/​tuition
• develop/​design/​plan a curriculum/ (especially British English) course/ (North American English) program/​syllabus
• give/​go to/​attend a class/​lesson/​lecture/​seminar
• hold/​run/​conduct a class/​seminar/​workshop
• sign up for/​take a course/​classes/​lessons
• go to/​start preschool/​kindergarten/​nursery school
• be in (North American English) the first, second, etc. grade/ (British English) year 1, 2. etc. (at school)
• study/​take/​drop history/​chemistry/​German, etc.
• (British English) leave/​finish/​drop out of/ (North American English) quit school
• (North American English) graduate high school/​college
• be the victim/​target of bullying
• (British English) play truant from/ (both British English, informal) bunk off/​skive off school (= not go to school when you should)
• (both especially North American English) skip/​cut class/​school
• (British English) cheat in/ (North American English) cheat on an exam/​a test
• get/​be given a detention (for doing something)
• be expelled from/​be suspended from school
• do your homework/ (British English) revision/​a project on something
• work on/​write/​do/​submit an essay/​a dissertation/​a thesis/​an assignment/ (North American English) a paper
• finish/​complete your dissertation/​thesis/​studies/​coursework
• hand in/ (North American English) turn in your homework/​essay/​assignment/​paper
• study/​prepare/ (British English) revise/ (North American English) review/ (North American English, informal) cram for a test/​an exam
• take/ (both British English) do/​sit a test/​an exam
• (especially British English) mark/ (especially North American English) grade homework/​a test
• (British English) do well in/ (North American English) do well on/ (especially North American English, informal) ace a test/​an exam
• pass/​fail/ (especially North American English, informal) flunk a test/​an exam/​a class/​a course/​a subject
• apply to/​get into/​go to/​start college/ (British English) university
• leave/​graduate from law school/​college/ (British English) university (with a degree in computer science)
• study for/​take/ (British English) do/​complete a law degree/​a degree in physics
• (both North American English) major/​minor in biology/​philosophy
• earn/​receive/​be awarded/​get/​have/​hold a master’s degree/​a bachelor’s degree/​a PhD in economics
• dissertation

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BA, BSc, MA, MSc, PhD - what do they all mean?

BA, BSc, MA, MSc, PhD (and more) are abbreviations of British degrees.

They reflect the specific level and discipline of a qualification achieved at university.

While most courses are conducted on a full-time basis, there are options for part-time, distance learning and other flexible learning arrangements.

Here is a breakdown of some of the most common qualifications and ones that Aberystwyth University offers.

• BA = Bachelor of Arts, Humanities and Social Sciences;
• BSc = Bachelor of Sciences;
• BENG = Bachelor of Engineering (Software, Robotics and Physics);
• LLB = Bachelor of Law.

Achieved after 3 to 4 years of study. The extra year (for a 4 year course) can be from a year studying abroad or a year working in industry.

Integrated-Masters:

• MARTS = Masters of Arts;
• MBIOL = Masters of Biology;
• MCOMP = Masters of Computer Science;
• MENG = Masters of Engineering;
• MMATH = Masters of Mathematics;
• MPHYS = Masters of Physics;
• MSCI = Masters of Sciences and Humanities.

4 years course (3-year Bachelors, 1 year Masters) that enables you to secure a loan for the full duration rather than having to fund a Masters degree separately.

• MA = Masters of Arts, Humanities and Social Sciences;
• MSc = Masters of Sciences;
• MBA = Masters of Business Administration;
• MPhil = Masters of Philosophy: Advanced research Masters degree;
• MRes = Masters of Research: Contains some taught and research elements;
• LLM = Masters of Law.

Achieved after graduation from Bachelors level, usually 1-2 years duration.

• PhD = Doctor of Philosophy: for a range of disciplines.

Achieved after graduating from Masters level, usually 3-8 years duration.

A wide range of Undergraduate, Postgraduate and Further-Research courses – across the Arts and Sciences – are available at Aberystwyth.

Should I Write Ph.D. or PhD? (Complete Guide)

As some of you are probably aware, the kind of English used on my side of the pond (England) is sometimes a bit different to the English used in the land of burgers and Trump.

Some words are spelt differently. But others just have a few bits of grammar difference.

Today, I want to look at the difference between Ph.D. and PhD. We’ll look at which one is correct, what it stands for, and why it’s a bit odd that it stands for that.

Should I Write Ph.D. Or PhD?

It is correct to write both Ph.D. and PhD. Which one is best to use depends on where you are in the world. In Great Britain, they tend to use Ph.D. In the United States of America, they prefer to use Ph.D.

What Does Ph.D. Or PhD Stand For?

Let’s try to understand what Ph.D. stands for.

It stands for two things. And it doesn’t stand for one or the other, it stands for both of them at the same time.

The first thing is “Doctor of Philosophy” and the second is “Philosophiae Doctor”. As the eagle-eyed among you may have noticed, “Philosophiae” is not English. It’s in Latin.

This goes back to the days when the only people who needed university were high thinkers and philosophers.

Why Americans And Brits Disagree On Ph.D. Or PhD

This could help us to understand why Brits prefer PhD but Americans prefer Ph.D.

Perhaps, according to the Brits, it stands for “Philosophiae Doctor”. But, according to the Americans, it stands for “Doctor or Philosophy”.

After all, the Brits do have a habit of trying to sound smarter. But, whichever one you use, people on both sides should know what you’re saying.

Why Ph.D. Or PhD Is A Bit Strange

Now, I want you all to understand how strange it is to call anyone with a PhD a “doctor of Philosophy”.

Let’s say someone gets a Ph.D. in history.

Well, first of all, is she really a doctor? If you break your leg, she’s not the first person you’ll go to for help.

But not only that, she studied history, not philosophy. So, she’s called a doctor of philosophy despite not being a doctor and not having studied history.

Yet, for some reason, we still call her a “Doctor of philosophy”.

Where Does The Word “Doctor” Come From?

When most of us hear the word “Doctor”, we think of someone who makes us better when we’re sick. And there may be a few of you who think of a skinny man who travels through time in a Police Box.

But originally, “Doctor” was Latin for teacher. Through time, you were able to get a “PhD” in more things than just philosophy.

And, if you wanted to become what we think of as a “Doctor”, you would need to have a “doctorate” in medicine.

Technically, “Doctor” would be the wrong word . But it’s become so common, it’s managed to “common” itself enough to become the right word.

How To Get A Ph.D. Or PhD

Now I’m afraid you can’t just walk into a university and walk out with a PhD. There are steps you need to take before you get there.

First of all, you will need to do a Bachelor’s degree. This is the degree you do when you first enter university. There are some jobs where a bachelors is enough.

Let’s be honest here, most of the time you spend doing a bachelor is just having fun.

If you want to, you can then progress onto doing a master’s degree. This is a bit more high level, and you tend to need to work for it.

Once you have your bachelors you may decide to go on to get a PhD. If you go for this, you will be officially able to call yourself an intellectual.

What Kind Of Word Is Ph.D. Or PhD?

There are three ideas for what kind of word Ph.D. is. I’ll tell you all of them and let you make up your own mind.

A PhD is something you have. You work towards it, and once you’ve handed in all of your papers, you get a PhD.

A PhD is also something you are. If you have a PhD, you might say “I’m a PhD.”

It can also be a title, similar to “Sir” or “OBE”.

If your name is James Smith, and you are PhD, your name and title could be, Mr James Smith PhD.

How To Address Someone With A Ph.D. Or PhD

Talking of this man called James Smith, there are several ways to address and introduce him.

• If you have a Ph.D., you are allowed to call yourself “Doctor” even if you don’t have a PhD in medicine. Therefore, if he wants, James could be called Dr Smith.
• Maybe he doesn’t want to be confused for a medical doctor but still wants to show off his Ph.D. In that case, we can call him James Smith PhD.
• But, like many with a Ph.D., he may not want to mention it unless it’s important. If he’s one of these people, we should just call him Mr Smith.

Ph.D. Or PhD Vs Doctorate

Asking “What’s the difference between a PhD and a doctorate?” is a bit like asking what the difference is between an apple and a fruit.

Just like an apple is a kind of fruit, a PhD is a kind of doctorate. However, it’s not the only doctorate there is.

Here are some forms of doctorate you may want to know.

Doctor of philosophy. But now also means Doctor of something there isn’t a doctorate for.

Doctorate in business.

Doctorate in engineering.

Doctorate in education

Doctor of medicine.

If you were wondering whether you should write “PhD” or “Ph.D.”, you can write either, both are grammatically correct, and both are very common terms that mean the same thing.

The only slight difference is that “PhD” is more common in England and “Ph.D.” is more common in America. This is perhaps because the British believe it stands for “philosophiae doctor” but Americans see it as “Doctor of Philosophy”.

But, no matter whether you use “PhD” or “Ph.D.”, to have one, you neither need to be a doctor nor study philosophy. All you need to do is stay in university for long enough to be able to get yourself a PhD. Then, you can become a PhD, and your title will be PhD.

You may also like: DSc Degree vs. PhD Degree – What’s the Difference? 9 Correct Ways to Write PhD Title on a Business Card

Martin holds a Master’s degree in Finance and International Business. He has six years of experience in professional communication with clients, executives, and colleagues. Furthermore, he has teaching experience from Aarhus University. Martin has been featured as an expert in communication and teaching on Forbes and Shopify. Read more about Martin here .

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What is a PhD?

• Types of Doctorates
• A Doctor of Philosophy (PhD) is the highest globally recognized postgraduate degree that higher education institutions can award.
• PhDs are awarded to candidates who undertake original and extensive research in a particular field of study.
• Full time PhD programmes typically last three to four years, whilst part time PhD programmes typically last six to seven years.
• A PhD can lead to an academia teaching role or a career in research. A PhD can also equip you with skills suitable for a wide range of jobs unrelated to your research topic or academia.

Definition of a PhD – A Doctor of Philosophy (commonly abbreviated to PhD , Ph.D or a DPhil ) is a university research degree awarded from across a broad range of academic disciplines; in most countries, it is a terminal degree, i.e. the highest academic degree possible.

PhDs differ from undergraduate and master’s degrees in that PhDs are entirely research-based rather than involving taught modules (although doctoral training centres (DTCs) offer programmes that start with a year of lecture-based teaching to help develop your research skills prior to starting your project).

In most English-speaking countries, those that complete a PhD use the title “Doctor” (typically abbreviated to Dr) in front of their names and are referred to as such within academic and/or research settings. Those that work in fields outside of academia may decide not to use the formal doctor title but use post-nominal letters (e.g. John Smith PhD); it’s unusual though for someone to use both the Doctor title and post-nominal letters in their name.

PhD vs Doctorate

A PhD and a professional doctorate are both research-based terminal degrees.

However, where a PhD focuses on original research mostly around theoretical concepts, a professional doctorate focuses on examining existing knowledge to solve real-life, practical problems.

While there is much crossover between the two, a PhD is generally better suited for an individual to wants to advance the knowledge and understanding in their field, and a professional doctorate degree is better suited to a working professional who wants to better be able to apply knowledge and understanding to their field.

What Are the Entry Requirements for a PhD?

To be accepted on to a PhD programme, students usually need to hold at least a high ( 2:1 and above ) undergraduate degree that is related to the field of research that they want to pursue. A PhD candidate may also be expected to hold a Master’s degree , however, this does not mean you must have one, as it is still possible to enrol into a PhD without a Master’s .

Self-funded courses may sometimes be more relaxed in relation to entry requirements. It may be possible to be accepted onto a self-funded PhD programme with lower grades, though these students typically demonstrate their suitability for the role through professional work experience.

Whilst a distance learning project is possible , most PhD candidates will carry out their research over at least three years based at their university, with regular contact with two academic supervisors (primary and secondary). This is particularly the case for lab-based projects, however, some PhD projects require spending time on-site away from university (e.g. at a specialist research lab or at a collaborating institution abroad).

How Long Does a PhD Take?

Typically, full-time PhDs last 3-4 years and part-time PhDs last 6-7 years. However, at the discretion of the university, the thesis writing-up period can be extended by up to four years.

Although most doctoral programmes start in September or October, they are generally much more flexible than taught-courses and can start at any time of the year.

How Much Does a PhD Cost?

Tuition fees for UK and EU students vary between £3,000 and £6,000 per year, with the average tuition fee of £4,712 per year for 2023/24 programmes.

Tuition fees increase considerably for international students, varying between £16,000 to £25,000 per year, with an average tuition fee of £19,600 per year .

Nonetheless, most students will secure PhD funding in the form of studentships, scholarships and bursaries to help pay for these fees. These funding opportunities can either be partial, which cover tuition fees only, or full, which cover both tuition fees and living expenses.

UK national students can also apply for Doctoral Loans from Student Finance England if they are unable to secure funding.

Finding a PhD has never been this easy – search for a PhD by keyword, location or academic area of interest.

What Does a PhD Involve?

To be awarded a PhD, a doctoral student is required to produce a substantial body of work that adds new knowledge to their chosen field.

A PhD programme will typically involve four key stages:

Stage 1: Literature Review

The first year of a PhD involves attending regular meetings with your supervisors and carrying out a search on previously published work in your subject area. This search will be used to produce a literature review which should set the context of the project by explaining the foundation of what is currently known within the field of research, what recent developments have occurred, and where the gaps in knowledge are. In most cases, this will be an extension of your research proposal should you have produced one as part of your application. The literature review should conclude by outlining the overarching aims and objectives of the research project. This stage of setting achievable goals which are original and contribute to the field of research is an essential first step in a successful PhD.

The supervisor is the main point of contact through the duration of a PhD – but remember: they are there to mentor, not to teach, or do it for you . It will be your responsibility to plan, execute and monitor your own work as well as to identify gaps in your own knowledge and address them.

Stage 2: Research

The second year (and prehapse some of your third year) is when you work on your research. Having identified novel research questions from your review of the literature, this is where you collect your data to help answer these questions. How you do this will depend on the nature of your doctoral research: for example, you may design and run experiments in a lab alongside other PhD students or visit excavation sites in remote regions of the world. You should check in regularly with your supervisors to update them and run any ideas or issues past them.

Have the structure and chapters of your thesis in mind as you develop and tackle your research questions. Working with a view of publishing your work will be very valuable later on.

Stage 3: Write up of Thesis

The next key stage of a PhD is writing a doctoral thesis , which typically takes from anywhere between three months to one year. A thesis is a substantial body of work that describes the work and outcomes of the research over the previous two to three years. It should tell a detailed story of the PhD project – focusing on:

• The motivations for the research questions identified from the literature review.
• The methodologies used, results obtained, and a comprehensive analysis and discussion of the findings.
• A detailed discussion of the key findings with an emphasis on the original contributions made to your field of research and how this has been impactful.

There is no universal rule for the length of a PhD thesis, but general guidelines set the word count between 80,000 to 100,000 words.

For your thesis to be successful, it needs to adequately defend your argument and provide a unique or increased insight into your field that was not previously available.

Stage 4: Attending the Viva

A viva voce , most commonly referred to as just a ‘ viva ‘, is an interview-style examination where the PhD student is required to engage in a critical appraisal of their work and defend their thesis against at least two examiners. The examiners will ask questions to check the PhD student has an in-depth understanding of the ideas and theories proposed in their thesis, and whether they have developed the research skills that would be expected of them.

The viva is one of the final steps in achieving a PhD, and typically lasts at least two hours, but this duration can vary depending on the examiners, the university and the PhD project itself.

Once you have done the viva – you’re on the home stretch. You will typically be asked to make some amendments to your thesis based on the examiner’s feedback. You are then ready to submit your final thesis for either:

• PhD – If you pass the requirements you will be awarded a PhD degree (most common outcome),
• MPhil – If you failed to meet requirements for a PhD, you may be downgraded to an MPhil degree (uncommon outcome),
• Fail – No award is given, typically for cases of plagiarism (extremely uncommon outcome).

What Is It Like to Undertake a PhD?

We’re often asked what it is like to undertake a PhD study. Unfortunately, this isn’t a simple answer to this question as every research project is different.

To help give insight into the life of a PhD student, we’ve interviewed PhD students at various stages of their programmes and put together a series of PhD Student Interviews . Check out the link to find out what a PhD is like and what advice they have to offer you.

What Are the Benefits of A PhD?

A PhD is the highest globally recognised postgraduate degree that higher education institutions can award. The degree, which is awarded to candidates who demonstrate original and independent research in a particular field of study, is not only invaluable in itself, but sets you up with invaluable skills and traits.

Career Opportunities

First, a PhD prepares you for a career in academia if you wish to continue in this area. This takes form as a career in the Higher Education sector, typically as a lecturer working their way to becoming a professor leading research on the subject you’ve studied and trained in.

Second, a PhD also enables the opportunity for landing a job in a research & development role outside of the academic environment. Examples of this include laboratory work for a private or third sector company, a governmental role and research for commercial and industrial applications.

Transferable Skills

Finally, in possessing a PhD degree, you can show to employers that you have vital skills that make you an asset to any company. Three examples of the transferable skills that you gain through a PhD are effective communication, time management, and report writing.

• Communication – presenting your work in written and oral forms using journal papers and podium presentations, shows your ability to share complex ideas effectively and to those with less background knowledge than you. Communication is key in the professional environment, regardless of the job.
• Time management – The ability to prioritise and organise tasks is a tremendous asset in the professional industry. A PhD holder can use their qualification to demonstrate that they are able to manage their time, arrange and follow a plan, and stick to deadlines.
• Report writing – Condensing three years of work into a thesis demonstrates your ability to filter through massive amounts of information, identify the key points, and get these points across to the reader. The ability to ‘cut out the waffle’ or ‘get to the point’ is a huge asset in the professional industry.

Aside from the above, you also get to refer to yourself as a Doctor and add fancy initials after your name!

What Can I Do After a PhD?

One of the most desirable postdoctoral fields is working within independent Research and Development (R&D) labs and new emerging companies. Both industries, especially R&D labs, have dedicated groups of PhD graduates who lead research activities, design new products and take part in crucial strategic meetings. Not only is this a stimulating line of work, but the average salaries in R&D labs and emerging start-ups are lucrative. In comparison, an undergraduate with five years of experience within their given field will, on average, likely earn less than a new PhD graduate taking on a R&D position.

It’s a common misunderstanding that PhDs only opens the door for an academic career such as university lecturers and training providers. Although obtaining a PhD opens these doors, the opportunities extend far beyond educational roles. In fact, recent data from the UK’s Higher Education Statistics Agency (HESA) indicates only 23% of PhD graduates take a position in educational roles . This low percentage is primarily because PhD graduates have a wide range of skills that make them suitable for a broad spectrum of roles. This is being seen first hand by the increasing number of PhD graduates who are entering alternative roles such as research, writing, law and investment banking.

How Do I Find a PhD?

We appreciate that finding a PhD programme to undertake can be a relatively daunting process. According to Higher Education Student Statistics , over 22,000 PhDs were awarded in 2016/17 within the United Kingdom alone. Clearly there are a huge number of PhD programmes available. This can sometimes be confusing for prospective doctorates, particularly when different programmes are advertised in different places. Often, it is difficult to know where to look or where to even start. We’ve put together a list of useful sources to find the latest PhD programmes:

• A great place to start is with our comprehensive and up-to-date database of available PhD positions .
• Assuming you are still at university, speak to an existing PhD supervisor within your department.
• Attend as many postgraduate open days as you can. Whilst there, speak to current PhD students and career advisors to get an awareness of what PhDs are on offer.
• Visit the postgraduate section of university websites and the PhD Research Council section of the UKRI website.

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PhD: so what does it really stand for?

Recently, during some particularly thorough literature research, I stumbled on a list of alternative interpretations of the acronym PhD. Most were funny: protein has degraded, parents have doubts. But one froze my face in a bittersweet grimace: paid half of what I deserve.

When I was still a rookie PhD student, I read with outrage an Economist article entitled the disposable academic , which argued that doing a PhD is mostly needless. Lately, I've come to think of the PhD as more of a heavily spicy meal. It doesn't matter how much you enjoy the process, once you're done, you still have half of the pain ahead.

The years of academic slog to work your way up to a full tenure slot (professorship? ha – dream on!) are not much different from the work of a PhD in terms of relentless benchwork (pipetting hand disease) and unceasing literature research (pound head on desk), served on a fixed menu with professional uncertainty (please hire: desperate). All of which result in, if not professorship, then potential heavy drinking.

PhD students and postdocs are the working class of academic research and paid accordingly. Although postgraduates are crucial to the generation, discussion and dissemination of knowledge, 50% pay (i.e half of what they deserve) is standard for PhDs in natural sciences and not even guaranteed in the arts and humanities. It's depressing to think that the overall salary of a PhD candidate is less than the cost of much lab equipment. Lab devices are meant to last years – but, hell, what about the work of PhD students in a system where knowledge is incremental?

There could be several reasons for this discrepancy. Equipment and consumables are costly and have a substantial impact on future budget setting. The number of PhDs, meanwhile, is inflated and international competition is fierce. PhD candidates are earning a degree, which shouldn't come for free, and demands motivation and not a little self-denial – including financially.

PhD candidates are at their infancy in science and being trained to do something different from their education to date – lessons in theory combined with practical labwork – as they move into more independent, innovative research. And contributing to the advancement of knowledge requires a certain naive idealism, right? But does this mean it's okay to exploit highly educated individuals ( probably heavily in debt )? No.

The possible solutions are simple. The most obvious is: raise the salary of PhD students. A remedy for the resulting scarcity of resources would be stricter selection so that only the best candidates started a PhD. Realistically though, this is never going to happen. It's not because policymakers are greedy but because it would mean a reduction of PhDs and thus a slowdown of science.

A second option wouldn't hinder research, and might even enhance it: cut the salary of professors by half. If there are solid reasons for PhDs being paid half of what they deserve, then the same hold good for professors. They too are doing something different from their previous jobs. After tenure, natural scientists move out of the lab and into an office from where they supervise the research of their team members. The knowledge acquired before (both theoretical and practical) still counts, but the job looks quite different.

Political and managerial skills are equally essential, and nurtured for the sake of tenure, not science. Top-tier staff write proposals, manage funds and coordinate subaltern research units and are sometimes scarcely involved with the generation, presentation and discussion of results which is the core purpose of science. Some department chairs merely take note of advancements generated from the institutes they preside over, but co-author papers nonetheless.

Wages of these academic administrators, then, don't deserve to sit even at 50%. And however grim this may sound to today's professors and those postdocs close to a permanent role, the benefits might appeal to future professors much more. Reduction in salaries for tenured staff will create new professorial appointments and reduce the imbalance between the number of temporary researchers and professors, while smaller research units will favour better supervision of PhD candidates and reduce fixed costs.

Today's professors probably already earn too little, after so many years of being underpaid. As one reader wrote in response to that Economist article: "The PhD student is someone who forgoes current income in order to forgo future income." But if some of the surplus resulting from a slash in professorial salaries flowed down to PhDs and postdocs, then entry level professors would be put in a better financial position.

In this light, cuts to science funding (like those we have seen recently in the US) could be an opportunity. Will they slow down scientific advancement? Most probably, yes. But here is a chance for the elite to rethink the way science is done and stop placing merit only on the levels of grant money they gain, the papers they publish, and the prestige they acquire, but instead taking a closer look at the predicament of those who prop this community up.

Advocates of competition see it as a positive outcome of the current shortage of funding and resources. But to defend job insecurity as the main incentive to scientific advancement is offensive. Science would benefit more from a harmonious coexistence of its members than by favouring ruthless competition.

Jorge Cham, creator of the wittily depressing PhD Comics series, revealed that a major motivation for his sketches was to give solace to fellow PhDs struggling as he did through their postgraduate years. He interprets the acronym as piled higher and deeper. You might think of the paper bulk on your desk, but I believe he had something else in mind.

PhD actually stands for philosophiae doctor , or doctor of philosophy. As we say in my native Italian: prendila con filosofia (take it easy, take it as it comes). And waiting for a change in the current system, or for a global PhD manifesto to emerge, one cannot take it any other way.

This blog was written by a current PhD student in Italy

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Meaning of PhD in English

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• associate's degree
• baccalaureate
• bachelor's degree
• first degree
• summa cum laude

Ph.D. | American Dictionary

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GPT-4o’s Chinese token-training data is polluted by spam and porn websites

The problem, which is likely due to inadequate data cleaning, could lead to hallucinations, poor performance, and misuse.

• Zeyi Yang archive page

Soon after OpenAI released GPT-4o on Monday, May 13, some Chinese speakers started to notice that something seemed off about this newest version of the chatbot: the tokens it uses to parse text were full of spam and porn phrases.

On May 14, Tianle Cai, a PhD student at Princeton University studying inference efficiency in large language models like those that power such chatbots, accessed GPT-4o’s public token library and pulled a list of the 100 longest Chinese tokens the model uses to parse and compress Chinese prompts. 

Humans read in words, but LLMs read in tokens, which are distinct units in a sentence that have consistent and significant meanings. Besides dictionary words, they also include suffixes, common expressions, names, and more. The more tokens a model encodes, the faster the model can “read” a sentence and the less computing power it consumes, thus making the response cheaper.

Of the 100 results, only three of them are common enough to be used in everyday conversations; everything else consisted of words and expressions used specifically in the contexts of either gambling or pornography. The longest token, lasting 10.5 Chinese characters, literally means “_free Japanese porn video to watch.” Oops.

“This is sort of ridiculous,” Cai wrote, and he posted the list of tokens on GitHub .

OpenAI did not respond to questions sent by MIT Technology Review prior to publication. GPT-4o is supposed to be better than its predecessors at handling multi-language tasks. In particular, the advances are achieved through a new tokenization tool that does a better job compressing texts in non-English languages.

But at least when it comes to the Chinese language, the new tokenizer used by GPT-4o has introduced a disproportionate number of meaningless phrases. Experts say that’s likely due to insufficient data cleaning and filtering before the tokenizer was trained. 

Because these tokens are not actual commonly spoken words or phrases, the chatbot can fail to grasp their meanings. Researchers have been able to leverage that and trick GPT-4o into hallucinating answers or even circumventing the safety guardrails OpenAI had put in place.

Why non-English tokens matter

The easiest way for a model to process text is character by character, but that’s obviously more time consuming and laborious than recognizing that a certain string of characters—like “c-r-y-p-t-o-c-u-r-r-e-n-c-y”—always means the same thing . These series of characters are encoded as “tokens” the model can use to process prompts. Including more and longer tokens usually means the LLMs are more efficient and affordable for users—who are often billed per token.

When OpenAI released GPT-4o on May 13, it also released a new tokenizer to replace the one it used in previous versions, GPT-3.5 and GPT-4. The new tokenizer especially adds support for non-English languages, according to OpenAI’s website .

The new tokenizer has 200,000 tokens in total, and about 25% are in non-English languages , says Deedy Das, an AI investor at Menlo Ventures. He used language filters to count the number of tokens in different languages, and the top languages, besides English, are Russian, Arabic, and Vietnamese.

“So the tokenizer’s main impact, in my opinion, is you get the cost down in these languages, not that the quality in these languages goes dramatically up,” Das says. When an LLM has better and longer tokens in non-English languages, it can analyze the prompts faster and charge users less for the same answer. With the new tokenizer, “you’re looking at almost four times cost reduction,” he says.

Das, who also speaks Hindi and Bengali, took a look at the longest tokens in those languages. The tokens reflect discussions happening in those languages, so they include words like “Narendra” or “Pakistan,” but common English terms like “Prime Minister,” “university,” and “international ” also come up frequently. They also don’t exhibit the issues surrounding the Chinese tokens.

That likely reflects the training data in those languages, Das says: “My working theory is the websites in Hindi and Bengali are very rudimentary. It’s like [mostly] news articles. So I would expect this to be the case. There are not many spam bots and porn websites trying to happen in these languages. It’s mostly going to be in English.”

Polluted data and a lack of cleaning

However, things are drastically different in Chinese. According to multiple researchers who have looked into the new library of tokens used for GPT-4o, the longest tokens in Chinese are almost exclusively spam words used in pornography, gambling, and scamming contexts. Even shorter tokens, like three-character-long Chinese words, reflect those topics to a significant degree.

“The problem is clear: the corpus used to train [the tokenizer] is not clean. The English tokens seem fine, but the Chinese ones are not,” says Cai from Princeton University. It is not rare for a language model to crawl spam when collecting training data, but usually there will be significant effort taken to clean up the data before it’s used. “It’s possible that they didn’t do proper data clearing when it comes to Chinese,” he says.

The content of these Chinese tokens could suggest that they have been polluted by a specific phenomenon: websites hijacking unrelated content in Chinese or other languages to boost spam messages. 

These messages are often advertisements for pornography videos and gambling websites. They could be real businesses or merely scams. And the language is inserted into content farm websites or sometimes legitimate websites so they can be indexed by search engines, circumvent the spam filters, and come up in random searches. For example, Google indexed one search result page on a US National Institutes of Health website , which lists a porn site in Chinese. The same site name also appeared in at least five Chinese tokens in GPT-4o. 

Chinese users have reported that these spam sites appeared frequently in unrelated Google search results this year, including in comments made to Google Search’s support community. It’s likely that these websites also found their way into OpenAI’s training database for GPT-4o’s new tokenizer. 

The same issue didn’t exist with the previous-generation tokenizer and Chinese tokens used for GPT-3.5 and GPT-4, says Zhengyang Geng, a PhD student in computer science at Carnegie Mellon University. There, the longest Chinese tokens are common terms like “life cycles” or “auto-generation.” 

Das, who worked on the Google Search team for three years, says the prevalence of spam content is a known problem and isn’t that hard to fix. “Every spam problem has a solution. And you don’t need to cover everything in one technique,” he says. Even simple solutions like requesting an automatic translation of the content when detecting certain keywords could “get you 60% of the way there,” he adds.

But OpenAI likely didn’t clean the Chinese data set or the tokens before the release of GPT-4o, Das says:  “At the end of the day, I just don’t think they did the work in this case.”

It’s unclear whether any other languages are affected. One X user reported that a similar prevalence of porn and gambling content in Korean tokens.

The tokens can be used to jailbreak

Users have also found that these tokens can be used to break the LLM, either getting it to spew out completely unrelated answers or, in rare cases, to generate answers that are not allowed under OpenAI’s safety standards.

Geng of Carnegie Mellon University asked GPT-4o to translate some of the long Chinese tokens into English. The model then proceeded to translate words that were never included in the prompts, a typical result of LLM hallucinations.

He also succeeded in using the same tokens to “jailbreak” GPT-4o—that is, to get the model to generate things it shouldn’t. “It’s pretty easy to use these [rarely used] tokens to induce undefined behaviors from the models,” Geng says. “I did some personal red-teaming experiments … The simplest example is asking it to make a bomb. In a normal condition, it would decline it, but if you first use these rare words to jailbreak it, then it will start following your orders. Once it starts to follow your orders, you can ask it all kinds of questions.”

In his tests, which Geng chooses not to share with the public, he says he can see GPT-4o generating the answers line by line. But when it almost reaches the end, another safety mechanism kicks in, detects unsafe content, and blocks it from being shown to the user.

The phenomenon is not unusual in LLMs, says Sander Land, a machine-learning engineer at Cohere, a Canadian AI company. Land and his colleague Max Bartolo recently drafted a paper on how to detect the unusual tokens that can be used to cause models to glitch. One of the most famous examples was “_SolidGoldMagikarp,” a Reddit username that was found to get ChatGPT to generate unrelated, weird, and unsafe answers.

The problem lies in the fact that sometimes the tokenizer and the actual LLM are trained on different data sets, and what was prevalent in the tokenizer data set is not in the LLM data set for whatever reason. The result is that while the tokenizer picks up certain words that it sees frequently, the model is not sufficiently trained on them and never fully understands what these “under-trained” tokens mean. In the _SolidGoldMagikarp case, the username was likely included in the tokenizer training data but not in the actual GPT training data, leaving GPT at a loss about what to do with the token. “And if it has to say something … it gets kind of a random signal and can do really strange things,” Land says.

And different models could glitch differently in this situation. “Like, Llama 3 always gives back empty space but sometimes then talks about the empty space as if there was something there. With other models, I think Gemini, when you give it one of these tokens, it provides a beautiful essay about El Niño, and [the question] didn’t have anything to do with El Niño,” says Land.

To solve this problem, the data set used for training the tokenizer should well represent the data set for the LLM, he says, so there won’t be mismatches between them. If the actual model has gone through safety filters to clean out porn or spam content, the same filters should be applied to the tokenizer data. In reality, this is sometimes hard to do because training LLMs takes months and involves constant improvement, with spam content being filtered out, while token training is usually done at an early stage and may not involve the same level of filtering. 

While experts agree it’s not too difficult to solve the issue, it could get complicated as the result gets looped into multi-step intra-model processes, or when the polluted tokens and models get inherited in future iterations. For example, it’s not possible to publicly test GPT-4o’s video and audio functions yet, and it’s unclear whether they suffer from the same glitches that can be caused by these Chinese tokens.

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