GPT-5.3-Codex
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
The figures
- Made by
- OpenAI
- Model ID
- openai/gpt-5.3-codex
- Input
- $1.75 per million tokens
- Output
- $14 per million tokens
- Context window
- 400K tokens
- Longest answer
- 128K tokens
- Takes in
- text, image, file
- Gives back
- text
- Reasoning
- Yes
- Tool calling
- Yes
- Reads images
- Yes
- Open weights
- No
- Released
- 24 Feb 2026
Read on 3 Oct 2026.