The AI arena is free today

Open Superagent

Atria Dawn Preview vs Claude Mythos Preview

Atria Dawn Preview and Claude Mythos Preview are closely matched at 52.3 and 54.9 on the LLM Stats Score.

Shanghai AI Laboratory · Anthropic · Updated for 2026

Which is better?

Atria Dawn Preview and Claude Mythos Preview are closely matched on the overall LLM Stats Score at 52.3 and 54.9.

In the 3 individual benchmarks reported for both models, Atria Dawn Preview wins 2; this is a narrower head-to-head signal than the composite indexes.

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

Choose Atria Dawn Preview

  • you value its reported benchmark strengths — it wins 2 of 3 exact shared results
  • you need open weights you can self-host or fine-tune

Choose Claude Mythos Preview

  • you want predictable pricing at $25.00/M input and $125.00/M output

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
Claude Mythos Preview
Anthropic
Core performance indexes
LLM Stats Score
52.3
#10
54.9
#4
Reasoning
50.5
#12
55.8
#2
Coding
36.2
#22
44.5
#4
Agents
38.8
#10
36.2
#17
Cost, coverage & limits
Benchmark wins
2 of 3
1 of 3
Input price
— / M
$25.00 / M
Output price
— / M
$125.00 / M
Context window
—
—

Individual benchmarks

12 reported for Atria Dawn Preview · 16 for Claude Mythos Preview

3 shared

Atria Dawn Preview outperforms in 2 benchmarks (BrowseComp, CyberGym), while Claude Mythos Preview is better at 1 benchmark (SWE-Bench Pro).

Atria Dawn Preview shows notably better performance in the majority of benchmarks.

Mon Sep 21 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Input capabilities

Documented input modalities across available providers

Claude Mythos Preview supports multimodal inputs, whereas Atria Dawn Preview does not.

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

Atria Dawn Preview

Text
Images
Audio
Video

Claude Mythos Preview

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while Claude Mythos Preview uses a proprietary license.

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

Atria Dawn Preview

MIT

Open weights

Claude Mythos Preview

Proprietary

Closed source

Release Timeline

When each model was launched

Atria Dawn Preview was released on 2026-09-11, while Claude Mythos Preview's release date is not specified.

We can confirm Atria Dawn Preview's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Atria Dawn Preview

Sep 11, 2026

1 weeks ago

Claude Mythos Preview

—

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 Atria Dawn Preview and Claude Mythos Preview side-by-side, then vote on the output you prefer.

Atria Dawn Preview
✓ Preferred
Claude Mythos Preview
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs Claude Mythos Preview.

Which is better, Atria Dawn Preview or Claude Mythos Preview?

Atria Dawn Preview and Claude Mythos Preview are closely matched on the LLM Stats Score at 52.3 and 54.9. Atria Dawn Preview is made by Shanghai AI Laboratory and Claude Mythos Preview is made by Anthropic. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Atria Dawn Preview compare to Claude Mythos Preview in benchmarks?

Atria Dawn Preview scores DeepSearchQA: 96.0%, BrowseComp: 92.5%, CyberGym: 86.5%, MLE-Bench Lite: 86.2%, WideSearch: 81.9%. Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%.

What are the main differences between Atria Dawn Preview and Claude Mythos Preview?

Key differences include LLM Stats Score (52.3 vs 54.9), multimodal support (no vs yes), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Atria Dawn Preview and Claude Mythos Preview?

Atria Dawn Preview is developed by Shanghai AI Laboratory and Claude Mythos Preview is developed by Anthropic.

Related comparisons