Models / OpenAI

OpenAI: GPT-5.1 Chat

openai/gpt-5.1-chat

GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...

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Context window128K

Maximum output32K

Provider offers0

Knowledge cutoffUndisclosed

Capabilities

What this model supports

ReasoningNo

Tool callingNo

Structured outputNo

AttachmentsNo

Temperature controlNo

Open weightsNo

Creator: OpenAI
Family: Not documented
Modalities: File, Image, Text
License: Not documented
Release date: Not documented
Model ID: openai/gpt-5.1-chat

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Evidence

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