Qwen3.5-397B-A17B vs Qwen3.8 Flash: Specs & Benchmark Comparison
Qwen3.5-397B-A17B and Qwen3.8 Flash both come from Alibaba, Qwen3.5-397B-A17B was released in February 2026, and Qwen3.8 Flash followed 6 months later in August 2026. Qwen3.5-397B-A17B is the larger model at roughly 397 billion parameters, against 125 billion for Qwen3.8 Flash.
The two models share 6 published benchmarks. Qwen3.8 Flash leads on 6 of them. The widest gaps are on Toolathlon, where Qwen3.8 Flash scores 73.5% against 38.3%; SWE-bench Multilingual, where Qwen3.8 Flash scores 81.0% against 69.3%. Averaged across everything we track, Qwen3.5-397B-A17B sits at 73.1% and Qwen3.8 Flash at 68.5%.
Qwen3.8 Flash is available through an API at $0.15 per million input tokens with a 1M-token context window. We do not track a hosted API for Qwen3.5-397B-A17B, so pricing and context cannot be compared directly.
| Characteristic | Qwen3.5-397B-A17B | Qwen3.8 Flash |
|---|---|---|
| Company | Alibaba | Alibaba |
| Release Date | February 15, 2026 | August 26, 2026 |
| Parameters | 397B | 125B |
| Multimodal | Yes | Yes |
| Context (input) | — | 1.0M |
| Context (output) | — | 131K |
| Input Price / 1M | — | $0.15 |
| Output Price / 1M | — | $0.47 |
| Average Score | 73.1% | 68.5% |
| Benchmarks | ||
| Toolathlon | 38.3% | 73.5% |
| SWE-bench Multilingual | 69.3% | 81.0% |
| LiveCodeBench v6 | 83.6% | 91.9% |
| Humanity's Last Exam | 28.7% | 35.9% |
| IFBench | 76.5% | 81.3% |
| GPQA | 88.4% | 91.7% |
Visual Benchmark Comparison
Verdict
Qwen3.8 Flash leads in 1 out of 2 comparison categories.
Both models show comparable average scores: Qwen3.5-397B-A17B — 0.7, Qwen3.8 Flash — 0.7.
Qwen3.8 Flash is newer: released 8/26/2026 vs 2/15/2026.
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Frequently Asked Questions
Which is better for coding — Qwen3.5-397B-A17B or Qwen3.8 Flash?
Which model is cheaper — Qwen3.5-397B-A17B or Qwen3.8 Flash?
Which has a larger context window — Qwen3.5-397B-A17B or Qwen3.8 Flash?
The Qwen3.5-397B-A17B and Qwen3.8 Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Qwen3.5-397B-A17B or Qwen3.8 Flash page. See also the complete list of AI model comparisons.