Qwen3.7-Max-Preview

Qwen3.7-Max-Preview is Alibaba’s text-only preview of the Qwen3.7 Max model, available through AnyFast’s OpenAI-compatible Chat Completions API at POST /v1/chat/completions. Use the model ID qwen3.7-max-preview for text generation, reasoning, and function calling in thinking mode.

Key capabilities

1M-token context window — The upstream specification allows 1,000,000 tokens.
131,072-token maximum output — Upstream limit; available output also depends on context.
Text-only input — Accept text messages.
Text output — Return text responses.
Thinking mode — Required; this preview has no non-thinking mode.

Quick example

cURL

curl --request POST \
  --url https://www.anyfast.ai/v1/chat/completions \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "model": "qwen3.7-max-preview",
  "messages": [
    {
      "role": "user",
      "content": "Explain a solar eclipse in one sentence."
    }
  ],
  "max_completion_tokens": 1024,
  "enable_thinking": true
}'

Python

from openai import OpenAI

client = OpenAI(api_key="YOUR_API_KEY", base_url="https://www.anyfast.ai/v1")
response = client.chat.completions.create(
    model="qwen3.7-max-preview",
    messages=[{"role": "user", "content": "Explain a solar eclipse in one sentence."}],
    max_completion_tokens=1024,
    extra_body={"enable_thinking": True},
)
print(response.choices[0].message.content)

Input modality

This model accepts text input and returns text. Do not send image_url or video_url parts to this model.

Thinking and structured output

The preview supports thinking mode only. Keep enable_thinking enabled or omit it. An AnyFast request with enable_thinking: false returned HTTP 400 with invalid_parameter_error.

Function calling

Define functions in tools. When the model returns finish_reason: "tool_calls" and message.tool_calls, execute the function in your application and continue the conversation. This request shape succeeded through AnyFast. In the preview thinking mode, use tool_choice: "auto" or none; required returned HTTP 400.

Python

tools = [{
    "type": "function",
    "function": {
        "name": "get_weather",
        "description": "Get weather for a city",
        "parameters": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"],
        },
    },
}]
response = client.chat.completions.create(
    model="qwen3.7-max-preview",
    messages=[{"role": "user", "content": "Call get_weather for Singapore."}],
    tools=tools,
    tool_choice="auto",
    extra_body={"enable_thinking": True},
)
print(response.choices[0].message.tool_calls)

Streaming

Set stream=True to receive SSE chunks. The verified final usage-only chunk has usage and an empty choices array.

Python

stream = client.chat.completions.create(
    model="qwen3.7-max-preview",
    messages=[{"role": "user", "content": "Say hello briefly."}],
    stream=True,
    stream_options={"include_usage": True},
    extra_body={"enable_thinking": True},
)
for chunk in stream:
    if chunk.choices:
        print(chunk.choices[0].delta.content or "", end="")
    if chunk.usage:
        print("\nTotal tokens:", chunk.usage.total_tokens)

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Exact ID: `qwen3.7-max-preview`.
`messages`	array	Yes	Conversation messages; text content only.
`max_completion_tokens`	integer	No	Maximum generated tokens; upstream limit is 131,072.
`enable_thinking`	boolean	No	Must remain true for this preview.
`stream`	boolean	No	Return Server-Sent Events when true.
`stream_options`	object	No	Set `include_usage: true` to receive usage in the final stream chunk.
`tools`	array	No	Functions available to the model.
`tool_choice`	string	No	In thinking mode use `auto` or `none`.

API Reference

Request and response fields for Qwen3.7-Max-Preview.

​Key capabilities

​Quick example

​Input modality

​Thinking and structured output

​Function calling

​Streaming

​Parameters

API Reference

​Official references

Key capabilities

Quick example

Input modality

Thinking and structured output

Function calling

Streaming

Parameters

Official references