Qwen3.5-397B-A17B (Reasoning)

by Alibaba Cloud / Qwen Team

Qwen3.5-397B-A17B (Reasoning) is a reasoning model from Alibaba Cloud / Qwen Team, released on February 16, 2026. It has a 262K-token context window and can generate up to 262K output tokens. API pricing is $0.45 per 1M input tokens and $3 per 1M output tokens. It ranks #49 of 220 models by Intelligence Score with a score of 38.5.

Qwen3.5-397B-A17B is Qwen's flagship Mixture-of-Experts model with 397 billion total parameters and 17 billion activated parameters. It delivers state-of-the-art performance across knowledge, reasoning, coding, mathematics, multilingual understanding, instruction following, long context, and agent tasks.

Key specs

ProviderAlibaba Cloud / Qwen Team
Release date2026-02-16
Licenseopen source
Context window262K tokens
Max output262K tokens
Input price$0.45 / 1M tokens
Output price$3 / 1M tokens
Intelligence Score38.5
Coding index22.7

Quick answers

What is the context window of Qwen3.5-397B-A17B (Reasoning)?

Qwen3.5-397B-A17B (Reasoning) has a context window of 262K tokens, with a maximum output of 262K tokens per response.

How much does Qwen3.5-397B-A17B (Reasoning) cost?

Qwen3.5-397B-A17B (Reasoning) costs $0.45 per 1M input tokens and $3 per 1M output tokens through the API.

Is Qwen3.5-397B-A17B (Reasoning) open source?

Yes. Qwen3.5-397B-A17B (Reasoning) is an open model released under the open source license.

When was Qwen3.5-397B-A17B (Reasoning) released?

Alibaba Cloud / Qwen Team released Qwen3.5-397B-A17B (Reasoning) on February 16, 2026.

How does Qwen3.5-397B-A17B (Reasoning) compare to Claude Opus 5.5 (Reasoning)?

Qwen3.5-397B-A17B (Reasoning) scores 38.5 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $0.45 vs $4 per 1M tokens.

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