Openai
GPT 5.1 Thinking (Fast)
An upgraded version of GPT-5 that adapts thinking time more precisely to the question to spend more time on complex questions and respond more quickly to simpler tasks.
Introducing GPT-5Model Snapshot
TypeLanguage
ReleaseNov 12, 2025
Context400,000
Tagsfile-input, implicit-caching, reasoning, tool-use
Overall
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Strength Profile
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Model Details
Runtime
Max Output128,000
Streaming speed is not measured for this model yet.
Pricing
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Input-
Output-
Catalog$2.50/M in / $20.00/M out
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