TL;DR
Below you’ll find details about RSI admissions, whether reapplying is even possible, a comparison table of research programs still open right now, and a two-week plan for turning this into finished work. RSI turns down almost everyone who applies, including students who go on to publish and get into MIT. If what you wanted was a real mentor and a paper with your name on it, you don’t have to wait a year for that. Apply to the Horizon Academic Research Program and start the work now.
Getting that email is rough. You put weeks into the application; you had the grades and the scores and the teacher who called you the strongest student they’d taught in years, and it still came back no.
Here’s what nobody says clearly enough: a no was the most likely answer for everyone who applied, including completely qualified people. Below is what the numbers actually show, what’s still open to you, and how to spend the next few months so that next time you’re applying with a finished research paper behind you.
What is the RSI acceptance rate?
CEE, which runs RSI, doesn’t publish one. No applicant count, no admit rate. If you’ve seen “3%” or “5%” somewhere, that’s someone’s estimate being repeated, not a number CEE released.
What CEE does publish tells you enough:
| What CEE states | Figure |
| Students at MIT each summer | 100 |
| Additional students at Stanford from 2027 | 50 |
| Cost to students | Free |
| Eligible grade | Juniors only. Seniors are not eligible |
| RSI 2027 deadline | 11:59 pm, December 11, 2026 |
| Length | About 7 weeks |
Run the math yourself. A free, MIT-hosted research program open to every high school junior in the world, with 100 seats. Thousands apply. The seat count doesn’t move.
So the decision probably had very little to do with any one weakness in your file. Once a program turns away most of its qualified applicants, the things that decide it are things you can’t control: which research areas had mentor capacity that year, which regions were already covered, which reader picked up your file at 11 pm. You weren’t rejected for not being impressive enough. You were rejected because there were 100 chairs.
If you want the full picture of how RSI works, we’ve got a complete guide to the Research Science Institute that covers the application, the mentors, and what the summer actually looks like. It also sits alongside our wider list of competitive research programs if you’re mapping out where else to aim.
Can you apply to RSI again next year?
For most people reading this, no, and it’s a rules thing rather than a judgment on you.
CEE’s rule is short: juniors are eligible, seniors aren’t. So if you applied as a junior and got turned down, that was your shot.
If you applied as a sophomore, you can go again as a junior, and you should. A second application from someone who spent the year actually doing research is a different application, not a resubmission.
That split tells you where to put your energy. If RSI is closed to you now, chasing it is wasted time. If you’ve got one attempt left, the only question that matters is what you’ll be able to point to twelve months from now that you couldn’t point to this time.
Either way, the answer’s the same, and it isn’t another program acceptance. It’s research you’ve done.
What should you do in the next two weeks?
A rejection goes down easier when you replace it with something concrete fast. Here’s a realistic fortnight.
Days 1 to 3: pick a question, not a field. Not “I’m into neuroscience” but “does X affect Y in Z group.” If that feels impossible right now, our guide on how to choose a research topic walks through narrowing it, and the piece on mistakes students make picking a research focus covers what usually goes wrong. If you want prompts to react to, there are subject lists for STEM and humanities.
Days 4 to 7: read five papers on it. Real ones, not summaries. Google Scholar and Semantic Scholar are the places to start, and there’s a roundup of free databases worth using. You’re hunting for the line in the discussion section where the authors say what they couldn’t do. That gap is often exactly where a high school project fits.
Days 8 to 10: apply to programs with open deadlines. The table below has them. Apply to more than one. Our lists of research mentorship programs and paid summer research programs are good places to widen the net.
Days 11 to 14: write something down. A two-page proposal. An annotated bibliography. A literature review. Anything that exists as a file instead of a plan. Students who bounce back fastest are the ones who produce a document in the first month. If you want a structure for the longer version, writing a research paper in 90 days lays out the full timeline.
What research programs can you still apply to?
RSI isn’t the only serious option, and several alternatives are open while RSI is shut. Deadlines move every cycle, so check each program’s own site before you apply.
| Program | Format | Cost | Who it suits |
| Horizon Academic Research Program | Online, 1-on-1 or small group, 10 to 16 weeks | $6,950, need-based aid available | Year-round starts, finishes with a paper |
| SIMR (Stanford) | In person, 8 weeks, summer | Free, stipend | Biomedical, Bay Area or willing to travel |
| MITES (MIT) | In person or online, summer | Free | STEM enrichment, strong on access |
| Clark Scholars (Texas Tech) | In person, 7 weeks, summer | Free, stipend | Lab research across many fields |
| Research competitions | Varies | Usually free to enter | Anyone who already has a project |
There’s more in our breakdown of the most prestigious summer research programs, the Stanford programs list, and the free online STEM research programs roundup if cost is the issue. If you’d rather work during term time than wait for summer, we also track research opportunities that run during the school year.
One note on strategy. Applying to five more lottery-odds programs and hoping is the same plan that just didn’t work. Pair the long shots with at least one route where the outcome depends on your work rather than on how many seats a program happens to have.
How does Horizon compare to RSI?
Side by side, using what each program publishes about itself.
| RSI | Horizon Academic | |
| Students per year | 100 at MIT, 50 at Stanford from 2027 | Up to 200 |
| Admit rate | Not published | About 26% |
| Cost | Free | $6,950, need-based aid under $75,000 household income |
| Format | In person, 7 weeks, summer only | Online, year-round cohorts |
| Eligibility | Juniors only | Grades 9 to 12, most admits in 10 and 11 |
| Entry bar | Not published | 3.67 unweighted GPA or equivalent |
| Mentorship | Scientist mentor | 1-on-1 with a PhD or post-doc, or a 3 to 6 student seminar |
| Output | Conference-style oral and written report | Capstone paper, about 5,000 words, graded on a university rubric |
| Publication support | Not listed as a feature | Up to 3 rounds of journal submission support (Labs) |
| Time commitment | Full time, residential | 8 to 10 hours a week, 100+ hours total |
RSI is free, it’s at MIT, and nothing matches that name on a transcript. If you’ve got another year of eligibility, apply again.
The differences that matter if you’ve just been turned down are availability, timing and what you walk away with.
On odds: Horizon states that about 26% of applicants are admitted, with up to 200 students a year. That’s still selective and plenty of people don’t get in, but it’s a different kind of bet than 100 global seats. Shortlisted applicants do a 30 minute interview. The admissions committee wrote up what they look for, and there’s a piece on students who got in off the waitlist if you’re feeling written off right now. If you applied to Horizon before and didn’t get in, there’s a separate guide on reapplying.
On output: the program is built around one deliverable, a capstone paper of roughly 5,000 words. Labs students get 15 instructor sessions one-on-one with a PhD or post-doc, plus 4 sessions with a writing coach and 4 with a publication specialist. Seminars run 20 instructor sessions in groups of 3 to 6. You keep all intellectual property and authorship rights. Labs students also get support through up to three rounds of journal submissions, though Horizon’s own page is explicit that it cannot and does not promise publication, which is the right thing for any program to say about something a journal decides.
On timing: RSI runs once a year, in summer, for juniors only. Horizon Labs run year-round over 16 weeks. The Winter 2026 cohort has a priority deadline of October 18, 2026, a final deadline of November 22, and starts December 14. If you’re reading this in autumn, that’s a program you could be inside before January.
The honest downsides: it costs $6,950, which is the obvious gap against a free program. Need-based aid exists for households under $75,000, but Horizon describes that pool as very competitive, so don’t count on it. There are also two scholarships, $695 for the top 25% of a cohort and $3,000 for the strongest application. And 8 to 10 hours a week on top of school is a real load, not a line on a resume.
No prior research experience is required, which matters if the thing that sank your RSI application was having nothing to point to yet.
Does an RSI rejection hurt your college applications?
No. Colleges never see it. There’s no field on the Common App for rejections, no shared database of summer program decisions, and no admissions officer who’ll know you applied.
What they see is what you did instead. Someone who got turned down by RSI and spent that summer producing real research looks, on paper, exactly like someone who never applied and did the same thing. The rejection is invisible. The work isn’t.
Which reframes the whole thing. What you wanted from RSI was never the acceptance email. It was the research, the mentor, and the paper at the end. Those are available through several routes, and RSI was only one of them. We’ve looked at whether summer research programs move the needle on admissions in more detail, and at what gets students into top programs in the first place.
Can you do research without getting into any program?
Yes, and for some people that’s the right call, especially if cost is the blocker.
You’ll need to find your own mentor, which usually means emailing professors at a nearby university with a short, specific message about their actual work. Expect most of them not to reply and send plenty. You’ll also be teaching yourself the method and the writing, which is slower alone but doable. Our guides on getting research opportunities in high school and publishing research in high school cover the mechanics, and if you’re in the sciences, how to do biology research in high school gets into the specifics.
The trade-off is time and follow-through. Far more students start a solo project than finish one. Structured programs exist because a deadline and a mentor expecting you on Thursday are what get papers written. If you’re sure you’ll hold yourself to it, go independent. If you know yourself well enough to doubt that, the structure is what you’re paying for.
Frequently asked questions
CEE doesn’t publish one. What’s public is that 100 students attend at MIT each summer, with 50 more at Stanford from 2027, chosen from a global pool of juniors. The implied rate is very low, but there’s no official figure.
Only if your first try was as a sophomore. Juniors are eligible, and seniors aren’t, so a rejected junior has no second attempt.
RSI 2027 applications close at 11:59 pm on December 11, 2026. Check CEE’s site for the current cycle.
Yes. CEE describes it as the first cost-free summer science and engineering program, and students pay no tuition.
No. Program rejections aren’t reported to colleges, and there’s no way for an admissions officer to learn about one.
Depends on what you were after. For free in-person lab work, look at SIMR and Clark Scholars. For year-round starts, a 26% admit rate, and a finished paper at the end, Horizon is built around that outcome.
Horizon students put in 8 to 10 hours a week and at least 100 hours total across 10 to 16 weeks. On your own, plan for longer. We break the timeline down into how long it takes to write a research paper.
Resources
External sources
- Research Science Institute, Center for Excellence in Education
- Stanford Institutes of Medicine Summer Research Program
- MIT Introduction to Technology, Engineering, and Science
- Anson L. Clark Scholars Program, Texas Tech
- Junior Science and Humanities Symposium
- Regeneron Science Talent Search
More from Horizon
- Everything You Need to Know About the Research Science Institute (RSI)
- The Ultimate Guide to Apply to SIMR as a High Schooler
- MITES Program: A Comprehensive Summer Experience
- Anson L. Clark Scholars Program Review
- Most Prestigious Summer Research Programs for High School Students
- Competitive Research Programs for High School Students
- Research Competitions for High School Students
- 15 Stanford Summer Research Programs for High School Students
- 17 Free Online STEM Summer Research Programs
- 12 Paid Summer Research Programs for High School Students
- Online Research Mentorship Programs for High School Students
- How to Get Research Opportunities in High School
- The Ultimate Guide to Writing a Research Paper in 90 Days
- How Long Does It Take to Write a Research Paper?
- STEM Research Topics for High School Students
- How to Apply to Horizon: Tips from the Admissions Committee
- From Waitlist to Admission at Horizon Academic
Image source: Horizon Academic Research Program