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Claude Mythos 5.1 vs Qwen2.5 14B Instruct

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 3.9.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to 3.9, ranking #31 overall.

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

Choose Claude Mythos 5.1

  • overall performance matters — it scores 45.1 and ranks #31 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Qwen2.5 14B Instruct

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

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
Qwen2.5 14B Instruct
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
45.1
#31
3.9
#304
Reasoning
44.4
#34
3.3
#299
Coding
37.5
#17
3.9
#212
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 · 16 for Qwen2.5 14B Instruct

No common benchmarks found

Claude Mythos 5.1 and Qwen2.5 14B Instructdon'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
Qwen2.5 14B Instruct
Input- tokens
Output- tokens
Tue Sep 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Mythos 5.1 supports multimodal inputs, whereas Qwen2.5 14B Instruct does not.

Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Mythos 5.1

Text
Images
Audio
Video

Qwen2.5 14B Instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Mythos 5.1 is licensed under a proprietary license, while Qwen2.5 14B Instruct uses Apache 2.0.

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

Claude Mythos 5.1

Proprietary

Closed source

Qwen2.5 14B Instruct

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while Qwen2.5 14B Instruct was released on 2024-09-19.

Claude Mythos 5.1 is 24 months newer than Qwen2.5 14B Instruct.

Claude Mythos 5.1

Sep 1, 2026

1 weeks ago

2.0yr newer
Qwen2.5 14B Instruct

Sep 19, 2024

2.0 years 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 Qwen2.5 14B Instruct side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
Qwen2.5 14B Instruct
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs Qwen2.5 14B Instruct.

Which is better, Claude Mythos 5.1 or Qwen2.5 14B Instruct?

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 3.9. Claude Mythos 5.1 is made by Anthropic and Qwen2.5 14B Instruct 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 Qwen2.5 14B Instruct in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. Qwen2.5 14B Instruct scores GSM8k: 94.8%, HumanEval: 83.5%, MBPP: 82.0%, MATH: 80.0%, MMLU-Redux: 80.0%.

What are the context window sizes for Claude Mythos 5.1 and Qwen2.5 14B Instruct?

Claude Mythos 5.1 supports 1.0M tokens and Qwen2.5 14B Instruct 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 Qwen2.5 14B Instruct?

Key differences include LLM Stats Score (45.1 vs 3.9), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and Qwen2.5 14B Instruct?

Claude Mythos 5.1 is developed by Anthropic and Qwen2.5 14B Instruct is developed by Alibaba Cloud / Qwen Team.

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