Qwen1.5vsQwen3.5-Plus

Qwen1.5
Qwen3.5-Plus
Specifications
Parameters
72B
Context window
32k
1M
Overview
CompanyQwenQwen
Release dateFeb 4 2024Feb 16 2026
AccessOpen WeightProprietary

Which is better: Qwen1.5 or Qwen3.5-Plus?

Qwen1.5 and Qwen3.5-Plus don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Qwen1.5 shipped 743 days before Qwen3.5-Plus, so benchmark comparisons should account for the intervening progress.

Context windows are 32k (Qwen1.5) vs 1M (Qwen3.5-Plus). Qwen1.5 is open weight, while Qwen3.5-Plus is proprietary.

Direct benchmark comparisons are unavailable — Qwen1.5 and Qwen3.5-Plus don't publish scores on any of the same benchmarks.

Frequently asked questions

Qwen1.5 was released by Qwen on Feb 4 2024.

Qwen3.5-Plus was released by Qwen on Feb 16 2026.

Qwen1.5 has a 32k context window; Qwen3.5-Plus has 1M.

Qwen1.5 is an open weight model released by Qwen. Qwen3.5-Plus is a proprietary model released by Qwen.

Other comparisons