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.
Performance Benchmarks
Comparative analysis across standard metrics
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.
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
Seed 2.1 Pro
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 License
Open weights
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.
Aug 2, 2026
3 weeks ago
1mo newerJun 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.
Outputs Comparison
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.
FAQ
Common questions about Qwen3.8 Max vs Seed 2.1 Pro.