o3
ECI#60
147o3 is a closed-weights model from OpenAI, released April 16, 2025. It has an ECI score of 147 and ranks 60th of 249 tracked models. At the time of its release, it ranked 1st of 128 tracked models. At $2/Mtok for input tokens and $8/Mtok for output tokens, it is more expensive per token than similarly-capable models.
Input price$2 / 1M tokens
Output price$8 / 1M tokens
ParametersUnknown
Training computeUnknown
o3 vs select alternatives
Reasoning
| Domain | Benchmark | o3 | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 147 | 142 | 144 | 141 | |
| Ranking | #60 | #98 | #82 | #103 | |
| Games | Chess PuzzlesBest score 72.0% | ||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 93.7% | ||||
MATH Level 5Best score 98.1% | |||||
OTIS Mock AIME 2024-2025Best score 100.0% | |||||
| Science | Humanity's Last ExamBest score 46.5% | ||||
GPQA DiamondBest score 95.8% | |||||
| Software engineering | METR Time HorizonsBest score 1044.8 | 119.7 | 38.8 | — | 60.4 |
SWE-bench VerifiedBest score 83.5% | |||||
| World knowledge | SimpleQA VerifiedBest score 75.6% |
