# GPT-5.1-Codex: AI model fact sheet

- **Provider:** openai
- **Released:** 2025-11-13
- **Context window:** 400,000 tokens
- **API pricing:** $1.25 / 1M input, $10.00 / 1M output
- **OpenRouter ID:** openai/gpt-5.1-codex
- **Capabilities:** conversation, reasoning, code-generation, analysis

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 including building projects from scratch, feature development, debugging, large-scale refactoring, and code review.

## Benchmarks

| Benchmark | Score |
| --- | --- |
| SWE-bench Verified | 73.7% |

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/gpt-5.1-codex