How to write a thesis statement, and use AI to test it

This guide is for high school, college and graduate students writing argumentative, analytical or expository papers. If you are writing a dissertation, start with how to write a research question: that is the hub of our planning series, and this post covers the essay-style thesis that follows from it.

What is a thesis statement?

A thesis statement is a sentence or two, usually at the end of the introduction, that states the main claim of a paper and tells the reader what the rest of the paper will support. Purdue OWL describes it as covering only what you will discuss, and placed at the end of the first paragraph in most papers [1]. UNC's Writing Center adds the key point: a thesis is "an interpretation of a question or subject, not the subject itself" [2].

A topic is not a thesis. "Social media and teenagers" is a topic. "Schools should ban phones during class because the evidence on attention is stronger than the evidence on learning benefits" is a thesis. It takes a position, gives a reason, and can be argued against.

What makes a strong thesis statement?

A strong thesis statement is arguable, specific and supportable. Use this checklist on every draft.

All examples in this post are illustrations of form, not claims we have checked. Your thesis must match your own evidence.

Thesis statement formulas

Formulas give you a first draft in two minutes. Fill the brackets, then rewrite the sentence so it reads naturally.

1. Claim + because + reason: [Position] because [main reason].
2. Although + counterclaim: Although [opposing view], [your position] because [reason].
3. Roadmap: [Position], as shown by [point 1], [point 2] and [point 3].
4. Analytical: By [technique or feature], [author or text] shows that [interpretation].
5. Expository: [Topic] works through [stage or part 1], [part 2] and [part 3].

Purdue OWL sorts papers into three types: analytical, expository and argumentative, and the thesis changes with the type [1].

15 thesis statement examples

These show the form of each type. They are examples, not checked findings: build yours from your own sources.

Argumentative (you take a side)

1. High schools should start no earlier than 8:30 a.m., because later starts fit teenagers' sleep patterns and the main cost, bus scheduling, can be solved.
2. Although standardized tests are cheap to grade, colleges should weigh them less than four-year grade averages, which reflect sustained effort.
3. Cities should replace minimum parking requirements with market pricing, because required parking raises housing costs for people who do not drive.
4. Universities should allow AI tools for brainstorming but require students to disclose their use, since a ban cannot be enforced and disclosure teaches judgment.
5. National parks should use timed-entry permits at their busiest sites, as shown by reduced crowding, steadier visitor numbers and better trail conditions.

Analytical (you interpret a text, event or data)

6. In Macbeth, Shakespeare uses sleep imagery to show guilt as a physical illness, not only a moral one.
7. By telling Frankenstein through three nested narrators, Mary Shelley makes readers question whose account of the creature to trust.
8. The 1918 influenza pandemic spread fastest in cities that lifted distancing measures early, suggesting timing mattered more than the measures themselves.
9. The survey data show that students who work more than 20 hours a week report lower grades mainly through lost study time, not stress.
10. Orwell's Animal Farm shows that changes in language prepare the ground for changes in power.

Expository (you explain)

11. Vaccines train the immune system in three steps: presenting an antigen, producing antibodies and memory cells, and responding faster to later exposure.
12. A bill becomes a federal law in the United States through introduction, committee review, floor votes in both chambers, and the president's signature.
13. Coral bleaching happens when heat stress breaks the partnership between corals and their algae, leaving the coral without its main food source.
14. Compound interest grows savings faster than simple interest because each period's interest earns interest in later periods.
15. The water cycle moves water through evaporation, condensation, precipitation and collection, driven by energy from the sun.

How to write a thesis statement in six steps

1. Turn the prompt into a question. "Discuss school start times" becomes "Should high schools start later?"
2. Answer it in one sentence, before you research much. This is your working thesis.
3. Gather evidence for and against. Note two or three strong sources on each side.
4. Revise the claim to fit the evidence. If the best evidence is weaker than your sentence, narrow the sentence.
5. Run the tests in the table above: arguable, specific, supportable, so what, how and why.
6. Revise again after drafting. Papers change as you write; update the thesis to match what the paper argues [1].

Worked example (illustrative)

• Prompt: Evaluate a policy that affects teenagers.
• Working thesis: "Schools should start later."
• After reading: the strongest sources are on sleep and attendance; there is less on grades.
• Revised thesis: "High schools should start no earlier than 8:30 a.m., because later starts give teenagers more sleep and improve attendance, and the main cost, bus scheduling, can be solved."

How to use an AI thesis statement generator the right way

An AI thesis generator is useful for two jobs: suggesting angles you have not thought of, and attacking your draft. It is weak at the job people most want from it, choosing your position, because it does not know your sources, your instructor or what you can defend. Check your course rules first; many allow brainstorming with disclosure and ban submitting AI-written text as your own. The UK's Russell Group universities, for example, have committed to teaching AI literacy while upholding academic rigor and integrity [4].

Brainstorm angles

Prompt any assistant with your topic and ask for options, not an answer:

"My topic is later school start times. Give me five different arguable positions, each one sentence, ranging from cautious to strong. Do not write the essay."

Pick one and rewrite it in your own words.

Stress-test your draft

Paste your own thesis and ask the AI to argue against it:

"Here is my thesis: [your sentence]. Give me the three strongest objections a teacher would raise, and say which part is too broad or vague."

Then decide which objections to answer in the paper. This is where AI thesis statement help is most useful: it acts as a skeptical reader.

What not to do

• Do not ask for a thesis and paste it in. It will be generic, and it may not match your evidence.
• Do not accept facts or references from a chatbot without opening the sources. Chatbots have been measured inventing references: one study found 55% of GPT-3.5 and 18% of GPT-4 citations were fabricated [3].
• Do not let the AI choose your evidence. Find it, read it, then cite it.

How to check a thesis statement against evidence

A thesis is only as strong as the evidence behind it. Before you commit, check that published research supports each part of the claim.

1. Split the thesis into checkable parts. "Later starts give more sleep" and "later starts improve attendance" are two claims.
2. Search for each part separately in a scholarly database, and note the study type and size.
3. Look for disagreement. If good studies disagree, soften the verb: "may improve", "is linked to".
4. Drop or narrow any part you cannot support.

For the full method, see how to check a claim against the research.

Test a thesis statement in AI for Research

AI for Research has no button that writes thesis statements, and that is deliberate. It helps with the parts that need real sources: checking your claim and finding the evidence.

• Check whether research supports your thesis (1 credit). Ask your thesis as a question in Deep Research at Summary depth, for example "Do later school start times improve attendance in high school students?". You get a short cited answer and a consensus line counted from the studies, such as how many of the studies that test the question support it. Open the papers it cites. See deep research.
• Check each claim in your introduction (2 credits). In the editor, Claim check labels up to 10 claims in a paragraph as supported, partly supported, not supported or no evidence, with the papers.
• Find sources (0 credits). Search 250M+ works in Find Papers and save them to your Library.
• For a thesis or dissertation (3 credits). The Research question module in the Thesis Suite refines a research question with FINER, PICO, PICOT or SPIDER and shows what the literature says, with citations.

The free plan includes 45 credits a month, and search costs nothing. See pricing. Limits: it searches scholarly papers, so a literary thesis about a novel still rests on your own reading of the text, and a "supported" label means published studies point that way, not that your argument is finished.

FAQ

Can AI write my thesis statement?

It can draft candidates, but the thesis should be yours. A thesis is your position on the question, and only you know what your evidence shows and what you can defend. Check your course rules first: some allow AI for brainstorming, others ban it. Where allowed, use AI to suggest angles and attack your draft, then write the final sentence in your own words.

What makes a strong thesis statement?

A strong thesis statement takes a position a reasonable reader could dispute, is specific enough to cover only what the paper discusses, and gives a reason or a roadmap. It answers the assignment's question in one or two sentences, usually at the end of the introduction. If a reader responds 'so what?' or 'how and why?', it needs more detail or a clearer stake.

How long should a thesis statement be?

Usually one sentence, sometimes two, of roughly 20 to 40 words in a school or college essay. It must be long enough to state your claim and the main reason, and short enough to read in one breath. Longer papers can carry a two-sentence thesis, where the second sentence previews the structure. If it needs a paragraph, it is not focused yet.

What is the difference between a thesis statement and a research question?

A research question asks what your study will find out; a thesis statement answers a question with a position you will argue. Essays usually lead with a thesis statement. Empirical theses and dissertations usually lead with a research question, then state the central argument or main finding in the abstract, introduction and conclusion once the results are in.

Is using an AI thesis generator cheating?

It depends on your institution's rules and how you use it. Copying a generated thesis into an essay that must be your own work usually breaks academic integrity policies. Using AI to brainstorm, then writing and defending your own position, is allowed in many courses if you disclose it. Read the syllabus, ask your instructor when unsure, and keep notes of how you used it.

Next steps

• For a dissertation, start one step earlier: how to write a research question.
• Turn the question into testable predictions: how to write a hypothesis.
• Back up each part of the thesis: how to cite evidence.
• Plan the chapters around it: how to write a thesis outline.

Sources

1. Purdue OWL. Tips and examples for writing thesis statements. https://owl.purdue.edu/owl/general_writing/the_writing_process/thesis_statement_tips.html
2. The Writing Center, University of North Carolina at Chapel Hill. Thesis statements. https://writingcenter.unc.edu/tips-and-tools/thesis-statements/
3. Walters, W. H., & Wilder, E. I. (2023). Fabrication and errors in the bibliographic citations generated by ChatGPT. Scientific Reports, 13(1), Article 14045. https://doi.org/10.1038/s41598-023-41032-5
4. Russell Group. Principles on the use of generative AI tools in education (2023). https://russellgroup.ac.uk/policy/policy-briefings/principles-use-generative-ai-tools-education