gpt-oss-120b
ECI#125
140gpt-oss-120b is an open-weights model from OpenAI, released August 5, 2025. It has an ECI score of 140 and ranks 125th of 240 tracked models. At the time of its release, it ranked 20th of 133 tracked models.
gpt-oss-120b vs select alternatives
| Domain | Benchmark | gpt-oss-120b | |||
|---|---|---|---|---|---|
ECI scoreBest score 173 | 140 | 136 | 141 | 140 | |
| Ranking | #125 | #136 | #124 | #126 | |
| Conceptual reasoning | SimpleBenchBest score 95% | ||||
| Games | Mystery Game PuzzlesBest score 90% | ||||
| Long context | Fiction.liveBenchBest score 97% | ||||
| Mathematics | OTIS Mock AIME 2024-2025Best score 100% | ||||
| Science | CritPt v1Best score 36% | ||||
SciCodeBest score 68% | |||||
GPQA DiamondBest score 97% | |||||
| Software engineering | Aider PolyglotBest score 88% | ||||
WeirdML (v2)Best score 94% |
