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OpenAI: GPT-5.1-Codex-Max API pricing
Last updated
- Input / 1M tokens
- $1.25
- Output / 1M tokens
- $10.00
- Blended / 1M
- $3.44
- 3:1 input:output
- Context window
- 400K
- tokens
- Arena Elo
- 1200
Context window
How much text fits in a single request.
400,000 tokens, roughly 300K words or 600 pages of English text.
Estimate assumes ~0.75 words per token and 500 words per page. Input and output share this limit.
Price history
USD per 1M tokens at each recorded price change.
| Date | Input / 1M | Output / 1M | Blended / 1M | Change |
|---|---|---|---|---|
| $1.25 | $10.00 | $3.44 | Launch |
Changelog
Notable updates to OpenAI: GPT-5.1-Codex-Max.
OpenAI: GPT-5.1-Codex-Max is now tracked, priced at 1.25 USD per 1M input tokens and 10 USD per 1M output tokens, with a 400000-token context window and 1200 Elo.
Summaries are AI-generated from tracked data changes.