GPT-5.2 Chat - AnyFast

Key capabilities
Quick example
Parameters

GPT-5.2 Chat is available through AnyFast via the OpenAI Responses API (/v1/responses).

Key capabilities

Responses API — Uses the newer /v1/responses endpoint with input instead of messages
Reasoning control — Configure reasoning effort (minimal / low / medium / high) and summary
Verbosity control — Set response verbosity to low, medium, or high
Streaming — Supports real-time token streaming via SSE
Tool use — Supports function calling and tool use

Quick example

curl https://www.anyfast.ai/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.2-chat",
    "input": [
      { "role": "user", "content": "Explain quantum entanglement in simple terms." }
    ],
    "reasoning": {
      "effort": "high",
      "summary": "auto"
    },
    "text": {
      "format": { "type": "text" },
      "verbosity": "medium"
    },
    "store": true
  }'

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Must be `gpt-5.2-chat`
`input`	array	Yes	List of `{ role, content }` objects
`stream`	boolean	No	Enable SSE streaming. Default: `false`
`temperature`	float	No	`0`\u20132. Controls randomness. Default: `1`
`top_p`	float	No	Nucleus sampling threshold. Default: `1`
`max_output_tokens`	integer	No	Maximum output tokens to generate
`stop`	string / array	No	Sequences that stop generation
`reasoning`	object	No	`{ effort, summary }` — controls reasoning depth
`text`	object	No	`{ format, verbosity }` — controls output format and verbosity
`tools`	array	No	List of tools the model may call
`store`	boolean	No	Store response for later retrieval. Default: `true`

API Reference

View the interactive API playground for GPT-5.2 Chat.

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