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GPT-5.1
OpenAI's flagship model for coding, reasoning, and agentic tasks across domains.
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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