International Mathematical Olympiad vs Regeneron ISEF Awards

Comparing two elite STEM opportunities. International Mathematical Olympiad is a olympiad while Regeneron ISEF Awards is a competition.

International Mathematical Olympiad Regeneron ISEF Awards
Prestige Tier Tier 1 — Elite Tier 2 — Highly Competitive
Type Olympiad Competition
Organization IMO Official Society for Science
Acceptance Rate Extremely competitive; approximately 0.01-0.1% of high school students worldwide reach IMO. For USA: ~6 students selected from 300,000+ AMC participants annually Approximately 1,600-1,700 finalists compete at ISEF annually out of significantly larger pool competing at 365+ affiliated fairs; roughly 600 finalists receive awards/prizes (37.5% of finalists awarded)
Applicants Approximately 5,000-6,000 contestants from 100+ countries compete at IMO annually. USA sends 6 representatives from ~300,000 AMC 10/12 participants Over 1,600 finalists selected annually from 365 Society-affiliated fairs across 60+ countries and territories; total number competing at all affiliated fairs globally is much larger (tens of thousands)
Deadline
Award $7,000,000
Cost to Apply Free Free
US Only No / International No / International
Grades High school students only; typically grades 9-12 (ages 13-19) 9th through 12th grade (high school students)
College Impact Extremely positive and highly prestigious. IMO medalists (especially gold) are exceptionally rare and highly valued by top universities globally. Impact includes: (1) Gold/Silver medalists essentially... Reaching Regeneron ISEF as a finalist is extremely prestigious in college admissions and carries significant weight. Top colleges (Ivy League, Stanford, MIT, etc.) view ISEF participation highly favor...