Calculate the cost of using gpt-5.1-codex-max from OpenAI for your AI applications
Pricing data last updated:
Mode: Responses
Max: 400,000 tokens
Max: 128,000 tokens
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gpt-5.1-codex-max is a responses model from OpenAI, one of 22 responses models they offer. It is priced at $1.25 per 1M input tokens and $10.00 per 1M output tokens, ranking 33 out of 143 responses models by cost and cheaper than 67% of models in this category. gpt-5.1-codex-max supports vision, function calling, reasoning, web search, prompt caching, structured output. Its 400K-token context window is in the top 50% among responses models.
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 400,000 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 33 out of 143 responses models by input cost. It is more affordable compared to the median of $2.00 for responses models, and is cheaper than 67% of models in this category.
gpt-5.1-codex-max is one of 22 OpenAI responses models, with support for vision, function calling, reasoning, web search, prompt caching, structured output. its 400K-token context window places it in the top 50% of responses models.
| Model | Provider | Input / 1M tokens | Output / 1M tokens | vs gpt-5.1-codex-max |
|---|---|---|---|---|
| grok-4.20-multi-agent-beta-0309 | xAI | $1.25 | $2.50 | 0% |
| codex-mini | Azure | $1.50 | $6.00 | +20% |
| gpt-5.1-codex | Azure | $1.38 | $11.00 | +10% |
Similar responses models from other providers
No. gpt-5.1-codex-max costs $1.25 per 1M input tokens while grok-4.20-multi-agent-beta-0309 costs $1.25 per 1M input tokens, making grok-4.20-multi-agent-beta-0309 0% more affordable for input. However, gpt-5.1-codex-max may offer different capabilities or performance characteristics that justify the price difference.
gpt-5.1-codex-max input pricing is $1.25 per 1M tokens, which is 37% below the median of $2.00 for responses models. It ranks 33 out of 143 responses models by input cost, making it cheaper than 67% of models in this category. For output, it costs $10.00 per 1M tokens compared to the median of $12.00.
Among OpenAI's 22 responses models, gpt-5.1-codex-max ranks 3 by input cost.
The most comparable responses models to gpt-5.1-codex-max are: grok-4.20-multi-agent-beta-0309 from xAI ($1.25/1M input tokens); 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). 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.