Introducing Codex (OpenAI) 16 May 2025
codex-1
codex-1 places in the top three on StrongREJECT.
6
Benchmarks with a score
0
Ranked first, out of five or more models
1
In the top three
OpenAI May 2025
codex-1
Closed weights Flagship
No Epoch Capabilities Index score yet
- StrongREJECT 98% #3 /22
Where it ranks
Its best score on each benchmark, and where that ranks among every model with a score there. We rank each model once, at its best setting.
Coding
| Benchmark | Score | Rank | Source | |
|---|---|---|---|---|
| SWE-bench Verified | 72.1% | #63 of 150 | Model card |
Safety and security
| Benchmark | Score | Rank | Source | |
|---|---|---|---|---|
| StrongREJECT | 98% | #3 of 22 | Model card | |
| Coding prompt injections | 98% | #2 of 4 | Model card | |
| Malware Refusals (Golden Set) | 98% | #3 of 3 | Model card | |
| Malware Refusals (Synthetic) | 97% | #1 of 1 | Model card | |
| Unexpected container or code states | 85% | #1 of 1 | Model card |
Its launch post
The benchmarks the lab chose to headline, with the scores it gave.
Its system card
Every result in the longer documents the lab published with it. 6 of them aren't in the launch post.
Addendum to o3 and o4-mini system card: Codex 16 May 2025