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Claude Mythos Preview vs Qwen3.8-27B

Claude Mythos Preview significantly outperforms across most benchmarks.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Mythos Preview outperforms in 5 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam, SWE-Bench Multimodal, SWE-Bench Pro), while Qwen3.8-27B is better at 1 benchmark (OSWorld-Verified). Claude Mythos Preview significantly outperforms across most benchmarks.

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

Choose Claude Mythos Preview

  • you want the strongest raw capability — it leads on 5 of 6 shared benchmarks

Choose Qwen3.8-27B

  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Qwen3.8-27B
Alibaba Cloud / Qwen Team
Benchmark wins
5 of 6
1 of 6
Input price
$25.00 / M
— / M
Output price
$125.00 / M
— / M
Context window
—
—
Released
—
Aug 2026
License
Proprietary
Apache 2.0

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Claude Mythos Preview outperforms in 5 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam, SWE-Bench Multimodal, SWE-Bench Pro), while Qwen3.8-27B is better at 1 benchmark (OSWorld-Verified).

Claude Mythos Preview significantly outperforms across most benchmarks.

Tue Aug 25 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Input Capabilities

Supported data types and modalities

Both Claude Mythos Preview and Qwen3.8-27B support multimodal inputs.

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

Claude Mythos Preview

Text
Images
Audio
Video

Qwen3.8-27B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Mythos Preview is licensed under a proprietary license, while Qwen3.8-27B uses Apache 2.0.

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

Claude Mythos Preview

Proprietary

Closed source

Qwen3.8-27B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Qwen3.8-27B was released on 2026-08-14, while Claude Mythos Preview's release date is not specified.

We can confirm Qwen3.8-27B's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Qwen3.8-27B

Aug 14, 2026

1 weeks 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 Claude Mythos Preview and Qwen3.8-27B side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Qwen3.8-27B
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Qwen3.8-27B.

Which is better, Claude Mythos Preview or Qwen3.8-27B?

Claude Mythos Preview significantly outperforms across most benchmarks. Claude Mythos Preview is made by Anthropic and Qwen3.8-27B is made by Alibaba Cloud / Qwen Team. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Mythos Preview compare to Qwen3.8-27B in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Qwen3.8-27B scores MathVision: 94.6%, OmniDocBench 1.5: 91.1%, LiveCodeBench v6: 90.3%, CharXiv-R: 90.2%, GPQA: 89.2%.

What are the main differences between Claude Mythos Preview and Qwen3.8-27B?

Key differences include licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Qwen3.8-27B?

Claude Mythos Preview is developed by Anthropic and Qwen3.8-27B is developed by Alibaba Cloud / Qwen Team.

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