GPT-5.1-Codex-Max
The spec sheet
Figures as the maker publishes them.
Price
- Input, per 1M tokens
- $1.25
- Output, per 1M tokens
- $10
Memory
- Context window
- 400K tokens
- Longest answer
- 128K tokens
Abilities
- Reasoning
- Yes
- Reads images
- Yes
- Calls tools
- Yes
- Takes in
- text, image
- Gives back
- text
The model
- Lab
- OpenAI
- Model id
- openai/gpt-5.1-codex-max
- Released
- 4 Dec 2025
- Open weights
- No
