Model detail
gpt-5.1-2025-11-13
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning to allocate computation dynamically, responding quickly to simple queries while spending more depth on complex tasks. The model produces clearer, more grounded explanations with reduced jargon, making it easier to follow even on technical or multi-step problems. Built for broad task coverage, GPT-5.1 delivers consistent gains across math, coding, and structured analysis workloads, with more coherent long-form answers and improved tool-use reliability. It also features refined conversational alignment, enabling warmer, more intuitive responses without compromising precision. GPT-5.1 serves as the primary full-capability successor to GPT-5
Model specs
- Context length
- 400K
- Max output
- 128K
- I/O modalities
- Text / Image
- Released
- 2025-11
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API endpoints
One MixRoute gateway, OpenAI-compatible
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OpenAI-compatible
/v1/chat/completionsPOST
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Pricing
Flat rate, unit: /1M Tokens
Input
$1.2500 /1M Tokens
Completion
$10.0000 /1M Tokens
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Selection summary
Quickly judge whether it fits your workload
What is this model good for?
General-purpose reasoning with adaptive computation
Use gpt-5.1-2025-11-13 for math, coding, and structured analysis. It delivers improved instruction adherence and more natural conversational style with adaptive reasoning.
What should you check before using it?
Confirm the snapshot date matches your stability needs
This is the 2025-11-13 snapshot of GPT-5.1. Verify that this version provides the stability you need for your workloads.
Why use it through MixRoute?
Use the OpenAI-compatible endpoint with stable model ID
Use the confirmed compatible endpoint with model ID gpt-5.1-2025-11-13 through MixRoute for a pinned version.
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Token cost estimator
Live estimate from this page's pricing, not an actual bill
This model has no cache-read price; caching is not counted
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FAQ
gpt-5.1 is intended for general reasoning, coding, structured analysis, and conversational tasks that benefit from strong instruction adherence and adaptive reasoning.
One endpoint, a testable decision
Test this model and alternate routes with the same request format
Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.