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Qwen3.8-Flash-Next vs Seed 2.1 Pro

Qwen3.8-Flash-Next leads the LLM Stats Score 50.5 to 47.0.

Alibaba Cloud / Qwen Team · ByteDance · Updated for 2026

Which is better?

Qwen3.8-Flash-Next leads the overall LLM Stats Score 50.5 to 47.0, ranking #14 overall.

In the 11 individual benchmarks reported for both models, Qwen3.8-Flash-Next wins 9; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Qwen3.8-Flash-Next

  • overall performance matters — it scores 50.5 and ranks #14 on LLM Stats
  • you value its reported benchmark strengths — it wins 9 of 11 exact shared results
  • you want the most recent training data — it shipped Aug 2026
  • you need open weights you can self-host or fine-tune

Choose Seed 2.1 Pro

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

Qwen3.8-Flash-Next
Alibaba Cloud / Qwen Team
Seed 2.1 Pro
ByteDance
Core performance indexes
LLM Stats Score
50.5
#14
47.0
#20
Reasoning
50.6
#12
47.9
#18
Coding
38.4
#19
36.0
#25
Agents
37.2
#12
33.1
#22
Cost, coverage & limits
Benchmark wins
9 of 11
2 of 11
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Qwen3.8-Flash-Next
Seed 2.1 Pro
Math
33.3#50
39.8#15
Vision
34.6#11
34.9#10
Tool use
32.3#8
27.9#17
Multimodal
35.3#8
37.7#5
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

22 reported for Qwen3.8-Flash-Next · 94 for Seed 2.1 Pro

11 shared

Qwen3.8-Flash-Next outperforms in 9 benchmarks (Agents' Last Exam, CharXiv-R, ClawEval-MM, ERQA, MathVision, NL2Repo, RealWorldQA, SWE-Bench Pro, Toolathlon), while Seed 2.1 Pro is better at 2 benchmarks (Humanity's Last Exam, LVBench).

Qwen3.8-Flash-Next significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Input capabilities

Documented input modalities across available providers

Both Qwen3.8-Flash-Next and Seed 2.1 Pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Qwen3.8-Flash-Next

Text
Images
Audio
Video

Seed 2.1 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Qwen3.8-Flash-Next is licensed under Qwen Community License 1.0, while Seed 2.1 Pro uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Qwen3.8-Flash-Next

Qwen Community License 1.0

Open weights

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Qwen3.8-Flash-Next was released on 2026-08-26, while Seed 2.1 Pro was released on 2026-06-24.

Qwen3.8-Flash-Next is 2 months newer than Seed 2.1 Pro.

Qwen3.8-Flash-Next

Aug 26, 2026

2 days ago

2mo newer
Seed 2.1 Pro

Jun 24, 2026

2 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Qwen3.8-Flash-Next and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Qwen3.8-Flash-Next
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about Qwen3.8-Flash-Next vs Seed 2.1 Pro.

Which is better, Qwen3.8-Flash-Next or Seed 2.1 Pro?

Qwen3.8-Flash-Next leads the LLM Stats Score 50.5 to 47.0. Qwen3.8-Flash-Next is made by Alibaba Cloud / Qwen Team and Seed 2.1 Pro is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Qwen3.8-Flash-Next compare to Seed 2.1 Pro in benchmarks?

Qwen3.8-Flash-Next scores MathVision: 95.7%, LiveCodeBench v6: 91.9%, GPQA: 91.7%, CharXiv-R: 90.6%, RealWorldQA: 88.5%. Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%.

What are the main differences between Qwen3.8-Flash-Next and Seed 2.1 Pro?

Key differences include LLM Stats Score (50.5 vs 47.0), licensing (Qwen Community License 1.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Qwen3.8-Flash-Next and Seed 2.1 Pro?

Qwen3.8-Flash-Next is developed by Alibaba Cloud / Qwen Team and Seed 2.1 Pro is developed by ByteDance.

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