Qwen3.5 9B Base

Alibaba

alibaba/qwen3.5-9b-baseOpen Weights

Pre-trained Qwen3.5 base checkpoint for fine-tuning and research, without instruction tuning

Benchmark Pricing$0.30 / 1M in$0.81 / 1M out$0.06 cache read

Context: 262,144 tokens•Max Output: 65,536 tokens•Released: 2026-02-26

TECHNICAL SPECIFICATIONS

Context Window262,144262.1K tokens

Max Output65,53665.5K tokens

LicenseApache-2.0Self-hostable

Input Modalities

TextVisionVideo

Function / Tool CallingNot Supported

Structured OutputsPrompt Based

MODEL CONTEXT PROTOCOL (MCP) READINESS

⚠ Qwen3.5 9B Base does not natively advertise tool-calling capabilities. When connecting to MCP servers, function calling must be handled via structured prompt injection.

MCP Context Window Recommendations

With a context capacity of 262,144 tokens, this model can handle moderately large MCP tool definitions and multi-turn conversation logs comfortably.

API CALL INVOCATION EXAMPLE

// Example: Calling Qwen3.5 9B Base via OpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.ALIBABA_API_KEY,
});

const response = await client.chat.completions.create({
  model: "alibaba/qwen3.5-9b-base",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

console.log(response.choices[0].message.content);