o3-mini
o3-mini is an API-only (closed weights) language model from OpenAI, released January 31, 2025. The context window is 195K tokens. On the Epoch Capabilities Index it scores 140.6, rank 124 of 256 rated models. API price: $1.1 input / $4.4 output per million tokens.
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Lab
OpenAI
Released
January 31, 2025
Weights
API-only (closed weights)
Parameters
–
Context
195K
Price / M tokens
$1.1 / $4.4 in / out
Epoch ECI
140.6 #124
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Reasoning | 8.4 | Chess Puzzles, SimpleBench, Mystery Game Puzzles |
| Math | 31.4 | MATH level 5, OTIS Mock AIME 2024-2025, FrontierMath-Tiers-1-3-v2-Private, FrontierMath-Tier-4-v2-Private |
| Coding | 38.4 | Aider polyglot, GSO-Bench |
| Knowledge | 57.0 | GPQA diamond, SimpleQA Verified |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| MATH level 5 | 96.5% |
| OTIS Mock AIME | 76.9% |
| GPQA Diamond | 72.3% |
| Aider Polyglot | 60.4% |
| FrontierMath (Tiers 1–3) | 19.6% |
| SimpleQA Verified | 15.3% |
| Chess Puzzles | 10.6% |
| SimpleBench | 7.4% |
| GSO-Bench | 1.3% |
| FrontierMath-Tier-4-v2-Private | 0.0% |
| Mystery Game Puzzles | 0.0% |
Links
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