GPT-5.1 thinking

OpenAI's flagship model for coding, reasoning, and agentic tasks across domains. Thinking set to maximum.

Model Specifications

Context window 40,000 tokens
Max output 128,000 tokens
Knowledge cutoff September 2024
Multipart messages Yes
Vision capabilities Yes

Default Parameters

Temperature 0.3
Top P 1.0
Frequency penalty 0.0
Presence penalty 0.0

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