GPT-5.5
ECI#14
160GPT-5.5 is a closed-weights model from OpenAI, released April 23, 2026. It has an ECI score of 160 and ranks 14th of 253 tracked models. At the time of its release, it ranked 2nd of 200 tracked models.
GPT-5.5 vs select alternatives
| Domain | Benchmark | GPT-5.5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 169 | 160 | 160 | 157 | 155 | |
| Ranking | #14 | #15 | #26 | #35 | |
| Games | Chess PuzzlesBest score 76% | ||||
Earthborne Rangers (EBR-bench)Best score 76% | |||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 94% | ||||
FrontierMath Tier 4 (v2)Best score 100% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 83% | ||||
| Software engineering | MirrorCodeBest score 77% | ||||
SWE-bench VerifiedBest score 83% | |||||
| World knowledge | SimpleQA VerifiedBest score 76% |
