GPT-5.1-Codex
OpenAI released 2025-11-13
$3.44 per million tokens, balanced
No independent quality score.
No benchmark we track has measured this model. That is not the same as measuring it and finding it wanting — we simply cannot rank it, so we do not.
Every price dimension
| Input | $1.25/M |
|---|---|
| Output | $10.00/M |
| Cached input | $0.130/M |
| Web search | $0.01/call |
Independent scores
No independent benchmark has measured this model.
Best rankings by task
- mobileapps #24of 56 1191
- fullstack #29of 59 1086
Capability
| Context window | 400K |
|---|---|
| Max output | 128K |
| Input modes | text, image |
| Tool use | yes |
| Reasoning | always on |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-08-24 |
| Quality data | unrated |
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....