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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...
Available Providers (7)
| Provider | Model ID | Input Cost | Output Cost | Context | Max Output | Docs |
|---|---|---|---|---|---|---|
 NanoGPT | openai/gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 OpenRouter | openai/gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 128K | 16.4K | |
 ZenMux | openai/gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 128K | 64K | |
 Azure Cognitive Services | gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 128K | 16.4K | |
 OpenAI | gpt-5.1-chat-latest | $1.25/MTok | $10.00/MTok | 128K | 16.4K | |
 Requesty | openai/gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 128K | 16.4K | |
 Azure | gpt-5.1-chat | $1.25/MTok | $10.00/MTok | 128K | 16.4K |
Capabilities
Reasoning
Tool Calling
Attachments
Open Weights
Structured Output