GPT-5.1-Codex-Max pricing
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research. GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle. Below you will find 2 current rows with input and output dollars per million. Right now the lowest input is $1.25 and the lowest output is $10.00.
Pricing across providers
Every row is a seller of GPT-5.1-Codex-Max with token pricing we track. The cheapest input in this snapshot is from Openrouter. The bar chart shows the same input and output dollars per million for a quick scan.
| Provider | Input / 1M | Output / 1M | Cached input | Batch |
|---|---|---|---|---|
A Azure | $1.38 | $11.00 | $0.138 | — |
O Openrouter | $1.25 | $10.00 | — | — |
Input vs output · per provider
Cost calculator
Pick any of the providers above and type how many tokens you expect per day, week, or year. We turn that into rough dollar totals for GPT-5.1-Codex-Max.
Provider
0.137500¢ / req
0.550000¢ / req
Model specifications
These fields describe GPT-5.1-Codex-Max as we store it (source: OpenAI). They sit next to price so buyers can check limits and tools in one place.
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- Vision (images)
- Yes
- Tool / function calling
- Yes
- Streaming
- No
- Released
- Dec 2025
- Primary provider
- OpenAI
- Model family
- N/A
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Frequently asked questions
Answers pull from the same numbers you see on this page. The short model note from our index: GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows...
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