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 1 current row 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 |
|---|---|---|---|---|
O Openrouter | $1.25 | $10.00 | $0.125 | — |
Input vs output · 1M tokens
Cost calculator
Pick any provider row 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.
0.125000¢ / req
0.500000¢ / 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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