GPT-5.1 - AnyFast

Key capabilities
Quick example
Parameters

GPT-5.1 is available through AnyFast via an OpenAI-compatible interface.

Key capabilities

OpenAI-compatible — Works as a drop-in replacement with the OpenAI SDK
Streaming — Supports real-time token streaming via SSE
Tool use — Supports function calling and tool use
Flexible output — Supports JSON mode and structured output

Quick example

curl https://www.anyfast.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.1",
    "messages": [
      { "role": "user", "content": "Explain quantum entanglement in simple terms." }
    ]
  }'

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Must be `gpt-5.1`
`messages`	array	Yes	List of `{ role, content }` objects
`max_tokens`	integer	No	Maximum tokens to generate
`temperature`	float	No	`0`\u20132. Controls randomness. Default: `1`
`stream`	boolean	No	Enable SSE streaming. Default: `false`
`top_p`	float	No	Nucleus sampling threshold. Default: `1`
`stop`	string / array	No	Sequences that stop generation
`tools`	array	No	List of tools the model may call
`response_format`	object	No	Specify output format (e.g. JSON mode)

API Reference

View the interactive API playground for GPT-5.1.

GPT-5.2 Codex GPT-5.1 Chat