GPT-5.1 Codex
OpenAI · USA
Pricing & capacity
- Input price
- $1.25 / 1M tokens
- Output price
- $10.00 / 1M tokens
- Context window
- 200K
Capabilities
- Vision
- No
- Reasoning
- Yes
- Tool calls
- Yes
- Cursor
- Yes
- OpenRouter
- Yes
Coding benchmarks
- LiveCodeBench
- 84.9%
- Aider Polyglot
- —
- SWE-bench Verified
- 76.3%
- BFCL (Tool use)
- 65.18%
- Code Arena Elo
- 1328
Notes
Code-optimized. SWE 76.3% (Vellum). Arena 1328 (Feb 2026).