gpt-5.1-codex-max API pricing
Blended at 3:1 input to output: $3.44 per million tokens.
OpenRouter charges $1.25 per million input tokens and $10.00 per million output tokens.
Against the models nearest in price
Blended at a 3:1 input to output ratio.
| Source | ||||||
|---|---|---|---|---|---|---|
| gpt-5.1-codex-max This model | OpenRouter | $1.25 | $10.00 | 400,000 | $3.44 | ↗ |
| gemini-2.5-pro | Google AI | $1.25 | $10.00 | 1,048,576 | $3.44 | ↗ |
| gpt-5 | OpenAI | $1.25 | $10.00 | 272,000 | $3.44 | ↗ |
| gpt-5.1 | OpenAI | $1.25 | $10.00 | 272,000 | $3.44 | ↗ |
| gpt-5.1-chat-latest | OpenAI | $1.25 | $10.00 | 128,000 | $3.44 | ↗ |
| gpt-5-chat | OpenAI | $1.25 | $10.00 | 128,000 | $3.44 | ↗ |
| gpt-5-search-api | OpenAI | $1.25 | $10.00 | 272,000 | $3.44 | ↗ |
| gemini-2.5-pro-preview | OpenRouter | $1.25 | $10.00 | 1,048,576 | $3.44 | ↗ |
| gemini-2.5-pro-preview-05-06 | OpenRouter | $1.25 | $10.00 | 1,048,576 | $3.44 | ↗ |
Last checked . Methodology
Questions
How much does gpt-5.1-codex-max cost per million tokens?
$1.25 per million input tokens and $10.00 per million output tokens, with cached input at $0.125. At a 3:1 input to output mix that blends to $3.44. Checked 12 Sept 2026.
What would gpt-5.1-codex-max cost for a real workload?
A thousand requests a day at 2,000 input and 600 output tokens each comes to $255.00 a month.
What is the context window for gpt-5.1-codex-max?
400,000 tokens of input, with up to 128,000 tokens of output.
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