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Claude Mythos 5.1 vs Qwen3.8-Flash-Next

Claude Mythos 5.1 and Qwen3.8-Flash-Next are closely matched at 45.3 and 49.0 on the LLM Stats Score.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Mythos 5.1 and Qwen3.8-Flash-Next are closely matched on the overall LLM Stats Score at 45.3 and 49.0.

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

Choose Claude Mythos 5.1

  • you want the most recent training data — it shipped Sep 2026

Choose Qwen3.8-Flash-Next

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

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
Qwen3.8-Flash-Next
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
45.3
#33
49.0
#21
Reasoning
44.1
#36
48.9
#16
Coding
38.0
#18
35.8
#26
Agents
34.9
#22
34.9
#23
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
—

Individual benchmarks

1 reported for Claude Mythos 5.1 · 22 for Qwen3.8-Flash-Next

No common benchmarks found

Claude Mythos 5.1 and Qwen3.8-Flash-Nextdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Mythos 5.1 specifies input context (1,000,000 tokens). Only Claude Mythos 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Mythos 5.1
Input1,000,000 tokens
Output128,000 tokens
Alibaba Cloud / Qwen Team
Qwen3.8-Flash-Next
Input- tokens
Output- tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos 5.1 and Qwen3.8-Flash-Next support multimodal inputs.

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

Claude Mythos 5.1

Text
Images
Audio
Video

Qwen3.8-Flash-Next

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Mythos 5.1 is licensed under a proprietary license, while Qwen3.8-Flash-Next uses Qwen Community License 1.0.

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

Claude Mythos 5.1

Proprietary

Closed source

Qwen3.8-Flash-Next

Qwen Community License 1.0

Open weights

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while Qwen3.8-Flash-Next was released on 2026-08-26.

Claude Mythos 5.1 is 0 month newer than Qwen3.8-Flash-Next.

Claude Mythos 5.1

Sep 1, 2026

3 weeks ago

6d newer
Qwen3.8-Flash-Next

Aug 26, 2026

3 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 5.1 and Qwen3.8-Flash-Next side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
Qwen3.8-Flash-Next
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs Qwen3.8-Flash-Next.

Which is better, Claude Mythos 5.1 or Qwen3.8-Flash-Next?

Claude Mythos 5.1 and Qwen3.8-Flash-Next are closely matched on the LLM Stats Score at 45.3 and 49.0. Claude Mythos 5.1 is made by Anthropic and Qwen3.8-Flash-Next is made by Alibaba Cloud / Qwen Team. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Mythos 5.1 compare to Qwen3.8-Flash-Next in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. Qwen3.8-Flash-Next scores MathVision: 95.7%, LiveCodeBench v6: 91.9%, GPQA: 91.7%, CharXiv-R: 90.6%, RealWorldQA: 88.5%.

What are the context window sizes for Claude Mythos 5.1 and Qwen3.8-Flash-Next?

Claude Mythos 5.1 supports 1.0M tokens and Qwen3.8-Flash-Next supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Mythos 5.1 and Qwen3.8-Flash-Next?

Key differences include LLM Stats Score (45.3 vs 49.0), licensing (Proprietary vs Qwen Community License 1.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and Qwen3.8-Flash-Next?

Claude Mythos 5.1 is developed by Anthropic and Qwen3.8-Flash-Next is developed by Alibaba Cloud / Qwen Team.

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