What this page answers
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...
- OpenAI · openai/gpt-5.1-chat
- text+image+file->text · global model route
- 128,000 context · $1.25 input
Before connecting
Do not stop at the model name. Before integration, verify base URL, protocol, visible models, parameters, and limits together.
- supports max_completion_tokens
- supports max_tokens
- supports response_format
- supports seed
- supports structured_outputs
Next action
The goal is to catch search demand, then move users into model profiles, provider profiles, and key checking.
- Check whether the model fits the use case
- Then verify key permission and callable models
