GPT-5 nano
ECI#118
139GPT-5 nano is a closed-weights model from OpenAI, released August 7, 2025. It has an ECI score of 139 and ranks 118th of 253 tracked models. At the time of its release, it ranked 25th of 159 tracked models.
GPT-5 nano vs select alternatives
| Domain | Benchmark | GPT-5 nano | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 139 | 138 | 140 | 140 | |
| Ranking | #118 | #125 | #114 | #110 | |
| Conceptual reasoning | ARC-AGI-2Best score 95% | ||||
ARC-AGI-1Best score 99% | |||||
| Games | Chess PuzzlesBest score 72% | ||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | MATH Level 5Best score 98% | ||||
OTIS Mock AIME 2024-2025Best score 100% | |||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | Terminal-Bench 2.0Best score 85% | ||||
WeirdML (v2)Best score 94% |
