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Qwen3.8 Max vs Seed 2.1 Pro

Qwen3.8 Max significantly outperforms across most benchmarks.

Alibaba Cloud / Qwen Team · ByteDance · Updated for 2026

Which is better?

Qwen3.8 Max outperforms in 10 benchmarks (Agents' Last Exam, ERQA, LVBench, MobileWorld, NL2Repo, RealWorldQA, SWE-Bench Pro, Terminal-Bench 2.1, Toolathlon, Workspace Bench), while Seed 2.1 Pro is better at 3 benchmarks (Humanity's Last Exam, MMMU-Pro, OneMillion Bench). Qwen3.8 Max significantly outperforms across most benchmarks.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Qwen3.8 Max

  • you want the strongest raw capability — it leads on 10 of 13 shared benchmarks
  • 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 Max
Alibaba Cloud / Qwen Team
Seed 2.1 Pro
ByteDance
Benchmark wins
10 of 13
3 of 13
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—
Released
Aug 2026
Jun 2026
License
Qwen3.8-Max License
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

13 benchmarks

Qwen3.8 Max outperforms in 10 benchmarks (Agents' Last Exam, ERQA, LVBench, MobileWorld, NL2Repo, RealWorldQA, SWE-Bench Pro, Terminal-Bench 2.1, Toolathlon, Workspace Bench), while Seed 2.1 Pro is better at 3 benchmarks (Humanity's Last Exam, MMMU-Pro, OneMillion Bench).

Qwen3.8 Max significantly outperforms across most benchmarks.

Mon Aug 24 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Input Capabilities

Supported data types and modalities

Both Qwen3.8 Max and Seed 2.1 Pro support multimodal inputs.

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

Qwen3.8 Max

Text
Images
Audio
Video

Seed 2.1 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Qwen3.8 Max is licensed under Qwen3.8-Max License, 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 Max

Qwen3.8-Max License

Open weights

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Qwen3.8 Max was released on 2026-08-02, while Seed 2.1 Pro was released on 2026-06-24.

Qwen3.8 Max is 1 month newer than Seed 2.1 Pro.

Qwen3.8 Max

Aug 2, 2026

3 weeks ago

1mo 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 Max and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Qwen3.8 Max
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about Qwen3.8 Max vs Seed 2.1 Pro.

Which is better, Qwen3.8 Max or Seed 2.1 Pro?

Qwen3.8 Max significantly outperforms across most benchmarks. Qwen3.8 Max 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 benchmark scores, pricing, and capabilities above.

How does Qwen3.8 Max compare to Seed 2.1 Pro in benchmarks?

Qwen3.8 Max scores PaperBench: 93.0%, MRCR v2 (8-needle): 92.9%, GPQA: 92.6%, VideoMME w sub.: 90.4%, RealWorldQA: 88.0%. 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 Max and Seed 2.1 Pro?

Key differences include licensing (Qwen3.8-Max License vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Qwen3.8 Max and Seed 2.1 Pro?

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

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