MIT PRIMES: 6 Things to Know Before Applying in 2027

Oct 14

Updated November 2026

TL;DR

MIT PRIMES is a free, year-long research program in which high school sophomores and juniors work on unsolved problems in mathematics or bioinformatics with mentors, usually MIT graduate students or postdocs. Students in Greater Boston join MIT PRIMES in person; students elsewhere in the U.S. join remotely through PRIMES-USA. Applications for the 2027 cohort closed November 2, 2026 (closed), with decisions by early January 2027. The next cycle usually opens in early fall, with a deadline in early November 2027. Expect at least 10 hours a week from January to mid-June.

For most high schoolers, research ends when the summer does. What sets MIT PRIMES apart is time: a full calendar year with one hard problem, moving from advanced reading to real research, a talk at MIT's fall conference and a final paper. It's free, but it asks for a serious share of your school year.

Comparing math options? See our lists of math research opportunities for high school students, the best math summer programs and free online math programs.

Is MIT PRIMES free, and when are the deadlines?

Yes. MIT PRIMES and PRIMES-USA are both free, year-long programs. Applications for the 2027 program were due November 2, 2026, with recommendations due November 6 and decisions by early January 2027. Remote PRIMES-USA students need their own computer, webcam and reliable internet.

Detail	What you need to know
Tracks	MIT PRIMES (in person, Greater Boston) and PRIMES-USA (remote, rest of the U.S.)
Fields	Mathematics and bioinformatics (no new Computer Science admissions)
Cost	Free
Length	Calendar year: January 1 to December 31
Weekly time	At least 10 hours a week, January to mid-June
Eligibility	High school sophomores and juniors (including homeschooled) living in the U.S.
Acceptance rate	Not published
2027 deadline	November 2, 2026 (closed); next deadline usually early November 2027

Who can apply to MIT PRIMES?

High school sophomores and juniors, including homeschooled students, who live in the United States can apply. MIT says students outside the U.S., including those attending a U.S. online school from abroad, can't apply, but are welcome to join CrowdMath, MIT PRIMES' online research project with Art of Problem Solving.

MIT PRIMES is highly selective and doesn't publish an acceptance rate; it prefers applicants who meet at least one benchmark: USAMO or USAJMO qualification, an A in a college-level proof-based course (online counts), a listed intensive summer math program with a counselor's letter, or a letter from a college math professor. None is required. If you're outside the U.S., Ladder Internships accepts high school students worldwide for remote start-up internships, including in data, AI and finance.

How does the MIT PRIMES year work?

PRIMES runs in four phases across the calendar year.

January 1 to March 14 (Pi Day): advanced reading. You meet your mentor 1.5 hours a week and study recommended material, ending with a five-page reading report.
March 15 to June 15: active research. You work on your assigned problem, at least 10 hours a week.
June 15 to August 31: independent study. A flexible schedule that MIT says "does not conflict with any summer programs."
September 1 to December 31: write-up. You present at the PRIMES conference in mid-October and turn in a final paper.

Juniors may get individual or group projects, while sophomores work in groups. Mentors recommend readings toward a future project, and PRIMES assigns the project.

6 things to know before you apply to MIT PRIMES

1. MIT PRIMES is a full-year commitment

You start January 1 and finish with a final paper due December 31 to January 15. Unlike a summer program, PRIMES runs through two semesters of school, so plan around exams, sports and other activities before you apply.

2. MIT PRIMES expects at least 10 hours a week

From January to mid-June, PRIMES asks for at least 10 hours a week, including your weekly 1.5-hour mentor meeting during the reading phase. Summer is flexible and fall is "as needed," but the project keeps going.

3. MIT PRIMES and PRIMES-USA are free

Neither track charges tuition or fees. That makes PRIMES one of the most accessible serious research programs for high schoolers in the U.S.

4. Where you live decides your MIT PRIMES track

Students in Greater Boston join MIT PRIMES in person, and students elsewhere in the U.S. join PRIMES-USA remotely. You don't choose; your location does.

5. MIT PRIMES no longer admits Computer Science students

MIT says "there will be no new admissions to Computer Science," so you apply for mathematics, bioinformatics or both. Some math projects still touch on theoretical computer science.

6. The MIT PRIMES entrance problem set is the key test

MIT encourages you to apply if you solve at least 70% of the entrance problems. You may use AI on the problem set, but if an AI-assisted solution is accepted you must name the model, include your prompts and rewrite it in your own style. MIT doesn't recommend using AI for your personal statement.

Is MIT PRIMES worth it for college applications?

Yes, if research is what draws you: a year on an unsolved problem, a conference talk at MIT and a paper show colleges real depth and persistence. The stronger story is the problem itself, the ideas you tried and the setbacks you worked through, not the MIT name.

PRIMES is also very hard to get into, so build other experience in parallel. Ladder Internships places high school students in remote, eight-week start-up internships, where they work on a real project with a company coach, in fields such as AI, data and finance, with full financial aid available.

How do you apply to MIT PRIMES?

You apply through the same online portal for both tracks, on MIT's apply page. The application includes an online questionnaire with your ranked research interests, two or three recommenders, a personal statement of up to two pages, the math books and courses you've studied, your other math experience and computing skills, and your entrance problem set solutions. Shortlisted applicants are invited to an online interview about their solutions and reading.

Step	2027 cohort	2028 cohort (projected)
Applications due	November 2, 2026 (closed)	Usually early November 2027
Recommendations due	November 6, 2026	A few days after the application deadline
Decisions	By early January 2027	Usually early January 2028
Program starts	January 1, 2027	January 1, 2028

If you're a freshman or sophomore now, start working on past entrance problems and proof-based reading this year, so you're ready when the next problem set is posted.

Common questions about MIT PRIMES

What is the difference between MIT PRIMES and PRIMES-USA?

MIT PRIMES is the in-person track for Greater Boston students; PRIMES-USA is the remote track for students elsewhere in the U.S. Both are free and follow the same year-long structure.

What happens in the first months of MIT PRIMES?

From January 1 to March 14, you do advanced reading with your mentor, meeting 1.5 hours a week. You finish the phase with a five-page reading report before moving into active research.

Can you use AI on the MIT PRIMES problem set?

Yes, with disclosure. If an AI-assisted solution is accepted, you must name the model, include your prompts and rewrite the solution in your own style.

Can international students apply to MIT PRIMES?

Only if they live in the U.S. Students abroad can join CrowdMath instead. Ladder Internships also accepts high school students worldwide for remote, eight-week start-up internships, at 5 to 10 hours a week, with a company coach and full financial aid available. The next deadline is November 15, 2026, for the Winter I cohort starting December 7, 2026.

Dhruva Bhat

Dhruva Bhat is one of the co-founders of Ladder, and a Harvard College graduate. Dhruva founded Ladder Internships as a DPhil candidate and Rhodes Scholar at Oxford University, with a vision to bridge the gap between ambitious students and real-world startup experiences.