GPT-5.1-Codex
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....
The figures
- Made by
- OpenAI
- Model ID
- openai/gpt-5.1-codex
- Input
- $1.25 per million tokens
- Output
- $10 per million tokens
- Context window
- 400K tokens
- Longest answer
- 128K tokens
- Takes in
- text, image
- Gives back
- text
- Reasoning
- Yes
- Tool calling
- Yes
- Reads images
- Yes
- Open weights
- No
- Released
- 13 Nov 2025
Read on 3 Oct 2026.