All modelsCalculate what your real prompts cost on GPT-5.1-Codex-Max
GPT-5.1-Codex-Max
OpenAI model, released 4 Dec 2025.
$1.25
per 1M input tokens
$10.00
per 1M output tokens
$0.125
per 1M cached-read tokens
Price history
Price stable since we started tracking (7 Jul 2026). History will chart here as soon as it moves.
Specifications
- Lab
- OpenAI
- Released
- 4 Dec 2025
- Context window
- 400k tokens
- Max output
- 128k tokens
- Input modalities
- text, image
- Output modalities
- text
- Knowledge cutoff
- —
- Open source
- No
Frequently asked questions
How much does GPT-5.1-Codex-Max cost?
GPT-5.1-Codex-Max costs $1.25 per 1M input tokens and $10.00 per 1M output tokens (list price, updated every 6 hours).
What is GPT-5.1-Codex-Max's context window?
GPT-5.1-Codex-Max supports a 400k-token context window with up to 128k output tokens.