Calculate the cost of using gpt-5.1-codex-max from OpenAI for your AI applications
Pricing data last updated:
Mode: Responses
Max: 272,000 tokens
Max: 128,000 tokens
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gpt-5.1-codex-max is a responses model from OpenAI, one of 23 responses models they offer. It is priced at $1.25 per 1M input tokens and $10.00 per 1M output tokens, ranking 14 out of 50 responses models by cost and cheaper than 72% of models in this category. gpt-5.1-codex-max supports vision, function calling, reasoning, web search, prompt caching, structured output. It accepts up to 272K input tokens.
Note: Use the interactive calculator above to estimate costs for your specific usage patterns.
Use the maximum token limits shown above to understand the model's capacity. This model can handle up to 272,000 input tokens. The maximum output length is 128,000 tokens.
At $1.25 per 1M input tokens and $10.00 per 1M output tokens, gpt-5.1-codex-max ranks 14 out of 50 responses models by input cost. It is more affordable compared to the median of $4.13 for responses models, and is cheaper than 72% of models in this category.
gpt-5.1-codex-max is one of 23 OpenAI responses models, with support for vision, function calling, reasoning, web search, prompt caching, structured output.
| Model | Provider | Input / 1M tokens | Output / 1M tokens | vs gpt-5.1-codex-max |
|---|---|---|---|---|
| codex-mini | Azure | $1.50 | $6.00 | +20% |
| gpt-5.1-codex | Azure | $1.38 | $11.00 | +10% |
| gpt-5.1-codex-2025-11-13 | Azure | $1.25 | $10.00 | 0% |
Similar responses models from other providers
Yes. gpt-5.1-codex-max costs $1.25 per 1M input tokens compared to codex-mini's $1.50 per 1M input tokens, making it 20% more affordable. Both are responses models and share support for vision, function calling, reasoning, prompt caching, structured output.
gpt-5.1-codex-max input pricing is $1.25 per 1M tokens, which is 70% below the median of $4.13 for responses models. It ranks 14 out of 50 responses models by input cost, making it cheaper than 72% of models in this category. For output, it costs $10.00 per 1M tokens compared to the median of $24.75.
Among OpenAI's 23 responses models, gpt-5.1-codex-max ranks 4 by input cost.
The most comparable responses models to gpt-5.1-codex-max are: codex-mini from Azure ($1.50/1M input tokens); gpt-5.1-codex from Azure ($1.38/1M input tokens); gpt-5.1-codex-2025-11-13 from Azure ($1.25/1M input tokens); gpt-5-codex from Azure ($1.25/1M input tokens). These alternatives were selected based on similar capabilities, pricing, and provider diversity. You can compare any of these models in detail using the Bifrost Model Library.
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gpt-5.1-codex-max is priced based on input and output tokens. Use the interactive calculator at the top of this page to estimate costs for your specific workload. Enter your expected input and output tokens volume and the calculator will show the total cost breakdown. For reference, processing 1M input tokens costs $1.25 and generating 1M output tokens costs $10.00.
