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Qwen 3.x/3.5 (2025-2026): the open-weight volume leader
Canonical as of Sep 18, 2026
Qwen 3.x/3.5 (2025-2026): the open-weight volume leader
Qwen3 (Apr 2025, 0.6B→235B MoE, hybrid thinking modes) and the 3.5/3.8 line (2026) made Qwen the most-downloaded open family — Apache 2.0, strong multilingual, Omni variants.
Qwen 3.x → 3.5/3.8
As of: 2026-09 (3.8-Omni-Flash era)
The line
- Qwen3 (Apr 2025): 0.6B to 235B-A22B MoE; hybrid thinking — one model switches fast/thinking modes (
/think,/no_think); Apache-2.0; 119 languages. - Qwen3.5 → 3.8 (2026): incremental capability + Omni variants (native text/audio/vision in open weights) and speed-focused "Flash" tiers.
- Consistently the top of open leaderboards per size class through the period; the most downloaded model family on HF in 2026 stretches.
Why it matters operationally
- Apache-2.0 — genuinely OSI, usable anywhere including platforms (unlike Llama's custom license).
- Every size tier exists (0.6B→MoE); one family covers edge (phone/laptop) to server.
- Fine-tuning ecosystem (unsloth recipes etc.) is first-class; community quants (MLX/GGUF) drop within days.
Default recommendation for local/self-hosted agents in 2026: benchmark Qwen current vs Gemma vs Mistral at your task; Qwen wins more often than not on code+multilingual.