GPT 5.1 Codex Max
openai/gpt-5.1-codex-max
Multimodal
4 gateways
2x price spread
Where you can run it
| Gateway | Its id | Context | Max output | Input / Mtok | Output / Mtok |
|---|---|---|---|---|---|
| Cloudflare AI Gateway | openai/gpt-5.1-codex-max |
— | — | — | — |
| NanoGPT | openai/gpt-5.1-codex-max |
400K | 128K | $2.50 | $20.00 |
| OpenRouter Cheapest input | openai/gpt-5.1-codex-max |
400K | 128K | $1.25 | $10.00 |
| Vercel AI Gateway | openai/gpt-5.1-codex-max |
400K | 128K | $1.25 | $10.00 |
Prices are US dollars per million tokens, as published in each gateway's own catalog at the last crawl. A dash means that gateway publishes no value — not that it is free. Rows differ because gateways set their own markup, and some let you bring your own provider key.
- Canonical id
openai/gpt-5.1-codex-max- Vendor
- OpenAI
- Type
- Multimodal
- Gateways serving it
- CloudflareNanoGPTOpenRouterVercel
- Largest context window
- 400K tokens
- Input price range
- $1.25 – $2.50 / Mtok
- Price spread
- 2x between cheapest and dearest gateway
- Accepts
- Text, Image
- Returns
- Text
- Cataloged since
History
What changed for GPT 5.1 Codex Max
Recorded by the daily catalog crawl — when gateways picked this model up, dropped it, or repriced it.