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Atria Dawn Preview vs Claude Sonnet 5.5

Atria Dawn Preview and Claude Sonnet 5.5 are closely matched at 51.6 and 51.5 on the LLM Stats Score.

Shanghai AI Laboratory · Anthropic · Updated for 2026

Which is better?

Atria Dawn Preview and Claude Sonnet 5.5 are closely matched on the overall LLM Stats Score at 51.6 and 51.5.

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

Choose Atria Dawn Preview

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

Choose Claude Sonnet 5.5

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

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
Claude Sonnet 5.5
Anthropic
Core performance indexes
LLM Stats Score
51.6
#11
51.5
#12
Reasoning
49.9
#13
49.7
#16
Coding
35.2
#31
42.6
#7
Agents
37.7
#12
39.3
#9
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$2.00 / M
Output price
— / M
$10.00 / M
Context window
—
1,000,000

Individual benchmarks

12 reported for Atria Dawn Preview · 8 for Claude Sonnet 5.5

No common benchmarks found

Atria Dawn Preview and Claude Sonnet 5.5don'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 Sonnet 5.5 specifies input context (1,000,000 tokens). Only Claude Sonnet 5.5 specifies output context (128,000 tokens).

Shanghai AI Laboratory
Atria Dawn Preview
Input- tokens
Output- tokens
Anthropic
Claude Sonnet 5.5
Input1,000,000 tokens
Output128,000 tokens
Mon Sep 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Sonnet 5.5 supports multimodal inputs, whereas Atria Dawn Preview does not.

Claude Sonnet 5.5 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 Sonnet 5.5

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while Claude Sonnet 5.5 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 Sonnet 5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Atria Dawn Preview was released on 2026-09-11, while Claude Sonnet 5.5 was released on 2026-09-28.

Claude Sonnet 5.5 is 1 month newer than Atria Dawn Preview.

Atria Dawn Preview

Sep 11, 2026

2 weeks ago

Claude Sonnet 5.5

Sep 28, 2026

0 days ago

2w newer

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Atria Dawn Preview's cutoff date is not specified.

We can confirm Claude Sonnet 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Atria Dawn Preview's cutoff date.

Atria Dawn Preview

—

Claude Sonnet 5.5

Jun 2026

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Atria Dawn Preview and Claude Sonnet 5.5 side-by-side, then vote on the output you prefer.

Atria Dawn Preview
✓ Preferred
Claude Sonnet 5.5
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs Claude Sonnet 5.5.

Which is better, Atria Dawn Preview or Claude Sonnet 5.5?

Atria Dawn Preview and Claude Sonnet 5.5 are closely matched on the LLM Stats Score at 51.6 and 51.5. Atria Dawn Preview is made by Shanghai AI Laboratory and Claude Sonnet 5.5 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 Sonnet 5.5 in benchmarks?

Atria Dawn Preview scores DeepSearchQA: 96.0%, BrowseComp: 92.5%, CyberGym: 86.5%, MLE-Bench Lite: 86.2%, WideSearch: 81.9%. Claude Sonnet 5.5 scores OSWorld 2.1 (partial): 80.1%, Terminal-Bench 4.0: 70.6%, Humanity's Last Exam (with tools): 64.5%, Chartography (no tools): 61.6%, GDPval-AA 2.1: 61.5%.

What are the context window sizes for Atria Dawn Preview and Claude Sonnet 5.5?

Atria Dawn Preview supports an unknown number of tokens and Claude Sonnet 5.5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Atria Dawn Preview and Claude Sonnet 5.5?

Key differences include LLM Stats Score (51.6 vs 51.5), 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 Sonnet 5.5?

Atria Dawn Preview is developed by Shanghai AI Laboratory and Claude Sonnet 5.5 is developed by Anthropic.

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