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...
Developer
OpenAI
Release Date
November 13, 2025
Context Window
400,000 tokens≈ 533 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$1.25per million tokens
Output Cost
$10.00per million tokens
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