gpt-oss-120b
ECI#114
140gpt-oss-120b is an open-weights model from OpenAI, released August 5, 2025. It has an ECI score of 140 and ranks 114th of 253 tracked models. At the time of its release, it ranked 21st of 156 tracked models.
gpt-oss-120b vs select alternatives
| Domain | Benchmark | gpt-oss-120b | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 140 | 137 | 140 | 142 | |
| Ranking | #114 | #129 | #111 | #101 | |
| Agent | Vending-Bench 2Best score $15,515 | -$22 | — | — | $72 |
| Conceptual reasoning | SimpleBenchBest score 82% | ||||
| Games | Chess PuzzlesBest score 72% | ||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | OTIS Mock AIME 2024-2025Best score 100% | ||||
| Science | SciCodeBest score 67% | ||||
GPQA DiamondBest score 96% | |||||
| Software engineering | Aider PolyglotBest score 88% | ||||
WeirdML (v2)Best score 94% |
