The AI arena is free today

Open Superagent

Atria Dawn Preview vs GPT-5.5

Atria Dawn Preview leads the LLM Stats Score 51.9 to 48.0.

Shanghai AI Laboratory · OpenAI · Updated for 2026

Which is better?

Atria Dawn Preview leads the overall LLM Stats Score 51.9 to 48.0, ranking #10 overall.

In the 3 individual benchmarks reported for both models, Atria Dawn Preview wins 3; 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

  • overall performance matters — it scores 51.9 and ranks #10 on LLM Stats
  • your work emphasizes agents — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 3 of 3 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

  • you want predictable pricing at $5.00/M input and $30.00/M output

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
GPT-5.5
OpenAI
Core performance indexes
LLM Stats Score
51.9
#10
48.0
#26
Reasoning
50.1
#12
47.4
#23
Coding
35.6
#29
37.9
#19
Agents
38.2
#10
32.4
#28
Cost, coverage & limits
Benchmark wins
3 of 3
0 of 3
Input price
— / M
$5.00 / M
Output price
— / M
$30.00 / M
Context window
—
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Atria Dawn Preview
GPT-5.5
Tool use
28.3#17
26.9#23
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

12 reported for Atria Dawn Preview · 28 for GPT-5.5

3 shared

Atria Dawn Preview outperforms in 3 benchmarks (BrowseComp, CyberGym, SWE-Bench Pro), while GPT-5.5 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 specifies input context (1,050,000 tokens). Only GPT-5.5 specifies output context (128,000 tokens).

Shanghai AI Laboratory
Atria Dawn Preview
Input- tokens
Output- tokens
OpenAI
GPT-5.5
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 supports multimodal inputs, whereas Atria Dawn Preview does not.

GPT-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

GPT-5.5

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while GPT-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

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Atria Dawn Preview

Sep 11, 2026

1 weeks ago

4mo newer
GPT-5.5

Apr 23, 2026

5 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 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'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

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 side-by-side, then vote on the output you prefer.

Atria Dawn Preview
✓ Preferred
GPT-5.5
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs GPT-5.5.

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

Atria Dawn Preview leads the LLM Stats Score 51.9 to 48.0. Atria Dawn Preview is made by Shanghai AI Laboratory and GPT-5.5 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 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 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

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

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

Key differences include LLM Stats Score (51.9 vs 48.0), 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?

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

Related comparisons