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OpenAI · Language model
GPT-5.2 Chat
openai/gpt-5.2-chat- Language
GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
Specifications
- Context window
- 128,000 tokens
- Max output
- 32,000 tokens
- Input
- file, image, text
- Output
- text
- Tokenizer
- GPT
Supported parameters
Accepted by the model and forwarded as-is by the gateway.
- max_completion_tokens
- response_format
- seed
- structured_outputs
- tool_choice
- tools
Use it
POST /api/v1/chat/completions · MCP chat · full reference
curl https://omnirail.org/api/v1/chat/completions \
-H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
-d '{"model":"openai/gpt-5.2-chat","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'