Qwen3.8 Flash vs Seed 2.1 Pro: Specs & Benchmark Comparison
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| Characteristic | Qwen3.8 Flash | Seed 2.1 Pro |
|---|---|---|
| Company | Alibaba | ByteDance |
| Release Date | August 26, 2026 | June 24, 2026 |
| Parameters | 125B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 131K | — |
| Input Price / 1M | $0.15 | — |
| Output Price / 1M | $0.47 | — |
| Average Score | 0.7 | 0.6 |
| Benchmarks | ||
| Toolathlon | 0.7 | 0.5 |
| Humanity's Last Exam | 0.4 | 0.6 |
| Agents' Last Exam | 0.5 | 0.4 |
| ClawEval-MM | 0.6 | 0.5 |
| SWE-Bench Pro | 0.6 | 0.6 |
| CharXiv-R | 0.9 | 0.9 |
| RealWorldQA | 0.9 | 0.9 |
| LVBench | 0.8 | 0.8 |
| MathVision | 1.0 | 0.9 |
| NL2Repo | 0.5 | 0.5 |
| ERQA | 0.7 | 0.7 |
Visual Benchmark Comparison
Qwen3.8 Flash
Seed 2.1 Pro
Toolathlon0.7 vs 0.5
0.7
0.5
Humanity's Last Exam0.4 vs 0.6
0.4
0.6
Agents' Last Exam0.5 vs 0.4
0.5
0.4
ClawEval-MM0.6 vs 0.5
0.6
0.5
SWE-Bench Pro0.6 vs 0.6
0.6
0.6
CharXiv-R0.9 vs 0.9
0.9
0.9
RealWorldQA0.9 vs 0.9
0.9
0.9
LVBench0.8 vs 0.8
0.8
0.8
MathVision1.0 vs 0.9
1.0
0.9
NL2Repo0.5 vs 0.5
0.5
0.5
ERQA0.7 vs 0.7
0.7
0.7
Verdict
Qwen3.8 Flash leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: Qwen3.8 Flash — 0.7, Seed 2.1 Pro — 0.6.
Recency
Qwen3.8 Flash is newer: released 8/26/2026 vs 6/24/2026.
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Frequently Asked Questions
Which is better for coding — Qwen3.8 Flash or Seed 2.1 Pro?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Qwen3.8 Flash or Seed 2.1 Pro?
API pricing data is available on the individual model pages.
Which has a larger context window — Qwen3.8 Flash or Seed 2.1 Pro?
Context window data is available on the individual model pages.
The Qwen3.8 Flash and Seed 2.1 Pro comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Qwen3.8 Flash or Seed 2.1 Pro page. See also the complete list of AI model comparisons.