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Atria Dawn Preview vs GPT-5.5 Pro

Atria Dawn Preview and GPT-5.5 Pro are closely matched at 51.9 and 44.8 on the LLM Stats Score.

Shanghai AI Laboratory · OpenAI · Updated for 2026

Which is better?

Atria Dawn Preview and GPT-5.5 Pro are closely matched on the overall LLM Stats Score at 51.9 and 44.8.

In the 1 individual benchmarks reported for both models, Atria Dawn Preview wins 1; 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 1 of 1 exact shared results
  • you want the most recent training data — it shipped Sep 2026
  • you need open weights you can self-host or fine-tune

Choose GPT-5.5 Pro

  • you want predictable pricing at $30.00/M input and $180.00/M output

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
GPT-5.5 Pro
OpenAI
Core performance indexes
LLM Stats Score
51.9
#10
44.8
#38
Reasoning
50.1
#12
44.6
#33
Agents
38.2
#10
27.6
#44
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
— / M
$30.00 / M
Output price
— / M
$180.00 / M
Context window
—
1,050,000

Individual benchmarks

12 reported for Atria Dawn Preview · 5 for GPT-5.5 Pro

1 shared

Atria Dawn Preview outperforms in 1 benchmarks (BrowseComp), while GPT-5.5 Pro is better at 0 benchmarks.

Atria Dawn Preview significantly outperforms across most benchmarks.

Tue Sep 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.5 Pro specifies input context (1,050,000 tokens). Only GPT-5.5 Pro specifies output context (128,000 tokens).

Shanghai AI Laboratory
Atria Dawn Preview
Input- tokens
Output- tokens
OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-5.5 Pro supports multimodal inputs, whereas Atria Dawn Preview does not.

GPT-5.5 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Atria Dawn Preview

Text
Images
Audio
Video

GPT-5.5 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while GPT-5.5 Pro 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

GPT-5.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Atria Dawn Preview was released on 2026-09-11, while GPT-5.5 Pro was released on 2026-04-23.

Atria Dawn Preview is 5 months newer than GPT-5.5 Pro.

Atria Dawn Preview

Sep 11, 2026

1 weeks ago

4mo newer
GPT-5.5 Pro

Apr 23, 2026

5 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Atria Dawn Preview's cutoff date is not specified.

We can confirm GPT-5.5 Pro's training data extends to 2025-12-01, but cannot make a direct comparison without Atria Dawn Preview's cutoff date.

Atria Dawn Preview

—

GPT-5.5 Pro

Dec 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

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

Atria Dawn Preview
✓ Preferred
GPT-5.5 Pro
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs GPT-5.5 Pro.

Which is better, Atria Dawn Preview or GPT-5.5 Pro?

Atria Dawn Preview and GPT-5.5 Pro are closely matched on the LLM Stats Score at 51.9 and 44.8. Atria Dawn Preview is made by Shanghai AI Laboratory and GPT-5.5 Pro is made by OpenAI. 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 GPT-5.5 Pro in benchmarks?

Atria Dawn Preview scores DeepSearchQA: 96.0%, BrowseComp: 92.5%, CyberGym: 86.5%, MLE-Bench Lite: 86.2%, WideSearch: 81.9%. GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%.

What are the context window sizes for Atria Dawn Preview and GPT-5.5 Pro?

Atria Dawn Preview supports an unknown number of tokens and GPT-5.5 Pro supports 1.1M 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 GPT-5.5 Pro?

Key differences include LLM Stats Score (51.9 vs 44.8), 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 GPT-5.5 Pro?

Atria Dawn Preview is developed by Shanghai AI Laboratory and GPT-5.5 Pro is developed by OpenAI.

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