GPT 5.1
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Automatically routes prompts to fast or deep reasoning modes, with adaptive effort, enhanced tone and style controls, and improved coding and math.
Model Parameters
Advanced settings to control the behavior of the model.
A system prompt that will be prepended to all chat messages to guide the model's behavior. Automatically gets saved to your playground repository.
Controls randomness: 0 = deterministic, 2 = very creative
Maximum length of the response (1-128000 tokens)
GPT 5.1
Log in to chat with any model.