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Claude Mythos 5.1 vs DeepSeek R1 Distill Qwen 1.5B

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to -2.9.

Anthropic · DeepSeek · Updated for 2026

Which is better?

Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to -2.9, 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 DeepSeek R1 Distill Qwen 1.5B

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

At a glance

The differences that matter most.

Claude Mythos 5.1
Anthropic
DeepSeek R1 Distill Qwen 1.5B
DeepSeek
Core performance indexes
LLM Stats Score
45.1
#31
-2.9
#340
Reasoning
44.4
#34
-2.5
#330
Coding
37.5
#17
-4.6
#257
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 · 4 for DeepSeek R1 Distill Qwen 1.5B

No common benchmarks found

Claude Mythos 5.1 and DeepSeek R1 Distill Qwen 1.5Bdon'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
DeepSeek
DeepSeek R1 Distill Qwen 1.5B
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 DeepSeek R1 Distill Qwen 1.5B 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

DeepSeek R1 Distill Qwen 1.5B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Mythos 5.1 is licensed under a proprietary license, while DeepSeek R1 Distill Qwen 1.5B uses MIT.

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

Claude Mythos 5.1

Proprietary

Closed source

DeepSeek R1 Distill Qwen 1.5B

MIT

Open weights

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while DeepSeek R1 Distill Qwen 1.5B was released on 2025-01-20.

Claude Mythos 5.1 is 20 months newer than DeepSeek R1 Distill Qwen 1.5B.

Claude Mythos 5.1

Sep 1, 2026

1 weeks ago

1.6yr newer
DeepSeek R1 Distill Qwen 1.5B

Jan 20, 2025

1.6 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 DeepSeek R1 Distill Qwen 1.5B side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
DeepSeek R1 Distill Qwen 1.5B
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs DeepSeek R1 Distill Qwen 1.5B.

Which is better, Claude Mythos 5.1 or DeepSeek R1 Distill Qwen 1.5B?

Claude Mythos 5.1 leads the LLM Stats Score 45.1 to -2.9. Claude Mythos 5.1 is made by Anthropic and DeepSeek R1 Distill Qwen 1.5B is made by DeepSeek. 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 DeepSeek R1 Distill Qwen 1.5B in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. DeepSeek R1 Distill Qwen 1.5B scores MATH-500: 83.9%, AIME 2024: 52.7%, GPQA: 33.8%, LiveCodeBench: 16.9%.

What are the context window sizes for Claude Mythos 5.1 and DeepSeek R1 Distill Qwen 1.5B?

Claude Mythos 5.1 supports 1.0M tokens and DeepSeek R1 Distill Qwen 1.5B 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 DeepSeek R1 Distill Qwen 1.5B?

Key differences include LLM Stats Score (45.1 vs -2.9), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos 5.1 and DeepSeek R1 Distill Qwen 1.5B?

Claude Mythos 5.1 is developed by Anthropic and DeepSeek R1 Distill Qwen 1.5B is developed by DeepSeek.

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