gpt-oss-20b
ECI#125
138gpt-oss-20b is an open-weights model from OpenAI, released August 5, 2025. It has an ECI score of 138 and ranks 125th of 253 tracked models. At the time of its release, it ranked 29th of 156 tracked models.
gpt-oss-20b vs select alternatives
| Domain | Benchmark | gpt-oss-20b | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 138 | 137 | 140 | 137 | |
| Ranking | #125 | #129 | #111 | #128 | |
| Conceptual reasoning | LMCABest score 68.2 | 14.5 | 25.6 | 19.0 | 22.4 |
DTBenchBest score 99% | |||||
| Games | Chess PuzzlesBest score 72% | ||||
| Mathematics | OTIS Mock AIME 2024-2025Best score 100% | ||||
| Science | CritPtBest score 32% | ||||
SciCodeBest score 67% | |||||
GPQA DiamondBest score 96% | |||||
| Software engineering | ALE-BenchBest score 2951 | 566 | 558 | — | — |
WeirdML (v2)Best score 94% |
