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GPT-5.1
by OpenAI
Knowledge cutoffSep 2024
Context window400k tokens
Release dateNov 2025
Input
$1.25 / 1M tokensOutput
$10.00 / 1M tokensCached
$0.13 / 1M tokensOpenAI's advanced reasoning model. Now easier to understand and faster on simple tasks, more persistent on complex ones.
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