Research Science Institute (RSI) Acceptance Rate and 2026 Guide

Updated: 27th August, 2026

TL;DR 

RSI is free and highly selective. You'll pay a $75 application fee (waivers available), but tuition, housing, and meals are fully covered if you're admitted. The 2026 program ran June 28 to August 8, 2026 at MIT, sponsored by the Center for Excellence in Education (CEE). Applications for 2026 are now closed. Only current high school juniors can apply. You need one year left before graduation and must turn 16 by July 1 of the program year. Seniors are not eligible. The application deadline lands in early-to-mid December, not January or March like older guides say. You'll need essays, recommendation letters, your transcript, and standardized test scores ready well before then. If RSI doesn't work out, you have options. Programs like the Lumiere Research Scholar Program let you build a real, mentored research project on your own timeline instead of competing for one of 100 spots.

Do you want to spend your summer doing real research with experienced mentors? Do you want to meet peers who are just as into science as you are? Do you want to see what campus life at MIT is actually like?

If you said yes to all three, RSI is worth a hard look. It's a highly selective, cost-free summer research program hosted by MIT, and it lets you work through an entire research project from start to finish. Here's what you need to know about the program and how to put together a strong application.

What is RSI (Research Science Institute)? 

First launched in 1984, the Research Science Institute (RSI) is an international summer research program for high school students. It's sponsored by the Center for Excellence in Education (CEE) and hosted by MIT in Cambridge, Massachusetts, every summer.

During the first week, you'll take intensive STEM courses. For the five weeks after that, you'll go through the entire research cycle: reading current literature in your field, building a research plan, and working under the guidance of experienced scientists and researchers. In the final week, you'll turn your work into a written report and deliver an oral presentation.

Where can I see RSI past projects?

You can find distinguished written papers and oral presentations from past years here. Topics span a wide range of subjects, including mathematics, biology, physics, and robotics, so whatever corner of STEM you're into, there's a real chance you'll be able to explore it at RSI.

What's RSI's real acceptance rate? 

2.5-3.2%. 

According to CEE's application FAQ, RSI receives over 2,500 U.S. applications and 600 international applications each year (roughly 3,100 total) and admits 100 students. CEE describes this as accepting "less than 2.5% of applicants." 

However, doing the math on their own figures (100 ÷ ~3,100) the real acceptance rate lands closer to 3.2%. However, RSI is genuinely one of the hardest high school programs in the country to get into, on par with or harder than admission to the most selective colleges.

RSI at a glance - duration, cost, and who can apply

Detail	Info
Host	MIT (sponsored by the Center for Excellence in Education)
2026 program dates	June 28 – August 8, 2026
Duration	6 weeks (1 week coursework + 5 weeks research)
Cost to attend	Free (tuition, housing, meals covered)
Application fee	$75, non-refundable (fee waivers available)
Who can apply	Current high school juniors, 16+ by July 1 of program year
Applicants per year	~3,100 (about 2,500 U.S. + 600 international)
Students admitted per year	100
Acceptance rate	Under 2.5% per CEE; computes to ~3.2% off CEE's own numbers
Application deadline	Early-to-mid December (2026 cycle deadline: Dec 10, 2025, now closed)
Notification	March (no rolling admissions)

Is RSI Prestigious?

Yes, genuinely. RSI is known worldwide for its research opportunities and its association with MIT, and the fact that it costs nothing to attend only adds to the demand. Getting in signals serious research potential to admissions officers at MIT and other top universities, though it's worth being precise here: RSI doesn't guarantee admission anywhere, and no single program does.

How hard is it to get into RSI?

Very hard. With an acceptance rate of 2.5-3.2%, it’s a tough race to an admit.

Unlike college admissions, where a class of a few thousand gets spread across dozens of majors and priorities, RSI is picking 100 students globally for one thing: research potential in STEM.

A few things make getting in harder than it seems:

• The applicant pool is already self-selected. Most students applying have strong grades, rigorous coursework, and often some science competition history. 

• There's no rolling admission and no partial credit. Decisions come out all at once in March. A strong essay can't offset a late application. Late submissions aren't considered.

• Holistic review cuts both ways. CEE says strong essays, recommendations, and research interest can offset lower test scores, and that about 10% of admits have no prior research experience.

Who is eligible to apply to RSI? (Grade, Age, and Citizenship Rules)

Eligibility is specific:

• You must be entering your final year of high school, meaning you're a junior (11th grade) when you apply. Seniors cannot apply.

• You must be at least 16 years old by July 1 of the program year.

• Public, private, and homeschool students are all eligible.

• U.S. Citizens and Permanent Residents, including those studying overseas, apply directly to CEE. You are not nominated by your school.

• International applicants go through a country-specific process. Each participating country has its own selection procedure, and you'll need to confirm your country is participating before you apply. Check with CEE directly or see CEE's international applicant info for details.

On test scores, CEE recommends a PSAT Math score of 740+ and an Evidence-Based Reading and Writing score of 700+, or an ACT Math score of 33+. CEE reviews applications holistically, and strong essays, recommendations, and prior research or coursework can compensate for lower scores. About 10% of admitted RSI students have no prior research experience at all!

What does your RSI application include?

Each application includes:

• Essay responses about your goals in science, technology, engineering, or math.

• Recommendation letters. [If you've done research for 4+ weeks at a university or lab, get a letter from your research supervisor.

• Your official high school transcript.

• All standardized test scores, including PSAT, SAT, ACT, and AP exams. You're strongly encouraged to take the PSAT.

• A $75 non-refundable application fee. Fee waivers are available if you have demonstrated financial need. Contact CEE directly to ask.

What is RSI’s application timeline? When should I apply?

Milestone	Timing
Applications open	Early October (RSI 2026 opened for applications in October 2025)
Application deadline	11:59 p.m. ET, typically the second Wednesday of December (RSI 2026 deadline: December 10, 2025)
Decisions released	March, all at once (no rolling admissions)
Program dates (2026)	June 28 – August 8, 2026

What will you do at RSI?

RSI matches you with a mentor, typically an MIT faculty member, researcher, or graduate student, based on your background and interests from your application. You'll spend five weeks working full-time on an individual project in fields like mathematics, physics, biology, chemistry, neuroscience, computer science, robotics, or engineering.

The MIT Mathematics Department, for example, has run its RSI track since 1993: a graduate student mentor designs a project (often with a faculty advisor's input), meets with you daily, and helps you push the project.t. Past RSI math projects have gone on to place in competitions like the Regeneron Science Talent Search and Regeneron ISEF, and some have historically been submitted to the now-discontinued Siemens Competition. You can browse past MIT Math RSI projects to get a sense of the range and depth involved before you apply.

Tips to get into RSI

RSI is hard to get into with it’s 2.5-3.2% acceptance rate, but the right preparation can help you get there!

Tip #1: Prioritize academics and letters of recommendation.

Start with strong grades. RSI wants to see that you take rigorous coursework, especially in math, science, and engineering, so classes like AP Physics 1/C and AP Calculus AB/BC carry weight. Strong grades also build the relationships with teachers you'll need for recommendations. Ask at least 6 weeks before the deadline, and ask teachers who know you well from sophomore or junior year.

Tip #2: Aim for strong (not necessarily perfect) standardized scores.

Test scores aren't explicitly required for admission consideration in every case, but strong scores help. If you've taken AP exams, aim for 4s or 5s where possible. The PSAT is offered once a year in October, and the last chance to take it before applying is in 11th grade, so consider taking it earlier if you can. SAT or ACT scores can help too, though they're not mandatory.

Tip #3: Get involved in STEM competitions.

Science Olympiad, robotics club, USACO, Chemistry Olympiad, Math Olympiad, Regeneron ISEF, the Harvard/MIT Math Tournament, and the MIT THINK Scholars Program are all strong signals. Pick something you actually care about. That authenticity comes through in your application.

Tip #4: Get real research experience if you can.

This is the hardest tip to act on, since most high schoolers don't have easy access to research opportunities. If you can, reach out to teachers, guidance counselors, or university professors doing work in your area of interest. If that's not realistic where you live, CEE explicitly says it considers students in the context of the opportunities available to them, so don't assume a lack of access disqualifies you.

Example Student Profile: Puja Chopade

Every application should be different, but past acceptees can still be useful as a reference point for what a strong application looks like.

Puja Chopade was a junior at Bob Jones High School when she was accepted into RSI 

Her background included a second-place finish in Pathophysiology at the Future Health Professionals State Leadership Conference, a regional Science Bowl title with her team, and the role of President and co-founder of Bob Jones Science Academy, which runs the Bob Jones Science Challenge. She also won the Alabama Brain Bee, a neuroscience competition affiliated with the University of Alabama at Birmingham.

Outside of STEM, she was a competitive chess player: Assistant Tournament Director at her local Fall Scholars Tournament, a top-ten finisher in the Madison City Schools K-12 Open Section, and a tied-third finisher in the U1200 section of the Alabama State Chess Championship.

What made her application work wasn't any single credential. It was the combination: clear competence in science, leadership positions that showed real commitment (not just participation), and an outside interest that gave admissions officers a fuller picture of who she was.

Frequently Asked Questions About RSI

If you want to do research regardless of applying to RSI, the Lumiere Research Scholar Program pairs you with a PhD mentor to build a real project on your own timeline.

What is the Research Science Institute? RSI is a free, six-week STEM research program for high school juniors, hosted by MIT and sponsored by the Center for Excellence in Education (CEE) since 1984. You spend one week on coursework and five weeks conducting original research under a mentor, ending with a written paper and oral presentation.

What is RSI’s acceptance rate? How hard is it to get into RSI? Very hard. CEE receives around 3,100 applications a year (roughly 2,500 U.S. and 600 international) and admits 100 students, putting the acceptance rate between 2.5%-3.2%. It's one of the most selective high school programs in the country.

Who is eligible to apply to RSI? Current high school juniors with one year left before graduation, who will be at least 16 by July 1 of the program year. High school seniors cannot apply. Public, private, and homeschool students are all eligible, as are U.S. citizens, permanent residents, and international students from participating countries.

How much does RSI cost? RSI itself is free. Tuition, housing, and meals are fully covered for admitted students. You do need to pay a $75 non-refundable application fee, though fee waivers are available if you demonstrate financial need.

When is the RSI application deadline? The deadline falls in early-to-mid December, typically the second Wednesday of the month, at 11:59 p.m. ET. The 2026 cycle's deadline was December 10, 2025, and applications for 2026 are now closed. 

Do I need prior research experience to get into RSI? No. About 10% of admitted RSI students have no prior research experience. What matters more is genuine curiosity and a foundation in your area of interest, shown through coursework, independent learning, or relevant activities, even without a formal research background. If you want to start building that foundation now, Lumiere's Research Scholar Program is one way to get mentored research experience before you apply anywhere else.

Does getting into RSI guarantee I'll get into MIT? No. RSI participation is a strong signal to admissions committees, and many RSI alumni do go on to attend top universities, but it doesn't guarantee admission anywhere, including MIT. College admissions remain holistic, and no single program or credential decides the outcome.

What other summer research options are there if I don't get into RSI? RSI admits only 100 students a year, so most strong applicants won't get in, and that's not a reflection of your potential. Programs like the Simons Summer Research Program or Lumiere's own research mentorship options are worth exploring. You can also see a broader list of summer research programs for high schoolers.

What if you don’t get into RSI? 

RSI is one of the best research opportunities available to high schoolers, but it only has 100 spots and an acceptance rate of 2.5-3.2%. If you want mentored, original research experience without competing for one of the most selective programs in the country, the Lumiere Research Scholar Program pairs you 1-on-1 with a PhD mentor from Harvard, Oxford, or a similar institution to build a project on your own timeline. Last year, over 4,000 students applied for 500 spots. You can apply here.

If you're a low-income student, also look into the Lumiere Research Inclusion Foundation, a non-profit research program built specifically for talented students who need financial support. Last year, 150 students attended on full need-based aid.

If you're also considering how RSI fits into a broader MIT application strategy, our insider guide on how to get into MIT covers what the admissions committee looks for beyond any single summer program.

Stephen Turban is the co-founder of Lumiere Education and a graduate of Harvard College, where he earned an A.B. in Statistics before beginning a PhD at Harvard Business School. A former McKinsey & Company consultant and former researcher, his research has been covered by the Harvard Business Review, The Economist, BBC News, Freakonomics Radio, and the Washington Post. In his articles for Forbes, he writes on what students and professionals can learn from high school research, high school passion projects, critical thinking, and mentorship. At Lumiere, he leads a selective research program where students work one-on-one with a research mentor to develop an independent research paper. Connect with him on LinkedIn.