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Atria Dawn Preview vs GPT-5.6 Luna

Atria Dawn Preview leads the LLM Stats Score 52.3 to 45.1.

Shanghai AI Laboratory · OpenAI · Updated for 2026

Which is better?

Atria Dawn Preview leads the overall LLM Stats Score 52.3 to 45.1, ranking #10 overall.

The models split the 4 individual benchmarks reported for both models evenly.

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

Choose Atria Dawn Preview

  • overall performance matters — it scores 52.3 and ranks #10 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026
  • you need open weights you can self-host or fine-tune

Choose GPT-5.6 Luna

  • you want predictable pricing at $0.20/M input and $1.20/M output

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
GPT-5.6 Luna
OpenAI
Core performance indexes
LLM Stats Score
52.3
#10
45.1
#32
Reasoning
50.5
#12
44.2
#37
Coding
36.2
#22
36.3
#21
Agents
38.8
#10
31.6
#29
Cost, coverage & limits
Benchmark wins
2 of 4
2 of 4
Input price
— / M
$0.20 / M
Output price
— / M
$1.20 / M
Context window
—
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Atria Dawn Preview
GPT-5.6 Luna
Tool use
31.1#12
25.8#33
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

12 reported for Atria Dawn Preview · 45 for GPT-5.6 Luna

4 shared

Atria Dawn Preview outperforms in 2 benchmarks (AutomationBench, BrowseComp), while GPT-5.6 Luna is better at 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1).

Both models are evenly matched across the benchmarks.

Sun Sep 20 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-5.6 Luna specifies input context (1,050,000 tokens). Only GPT-5.6 Luna specifies output context (128,000 tokens).

Shanghai AI Laboratory
Atria Dawn Preview
Input- tokens
Output- tokens
OpenAI
GPT-5.6 Luna
Input1,050,000 tokens
Output128,000 tokens
Sun Sep 20 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-5.6 Luna supports multimodal inputs, whereas Atria Dawn Preview does not.

GPT-5.6 Luna 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-5.6 Luna

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while GPT-5.6 Luna 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-5.6 Luna

Proprietary

Closed source

Release Timeline

When each model was launched

Atria Dawn Preview was released on 2026-09-11, while GPT-5.6 Luna was released on 2026-07-09.

Atria Dawn Preview is 2 months newer than GPT-5.6 Luna.

Atria Dawn Preview

Sep 11, 2026

1 weeks ago

2mo newer
GPT-5.6 Luna

Jul 9, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.6 Luna has a documented knowledge cutoff of 2026-02-16, while Atria Dawn Preview's cutoff date is not specified.

We can confirm GPT-5.6 Luna's training data extends to 2026-02-16, but cannot make a direct comparison without Atria Dawn Preview's cutoff date.

Atria Dawn Preview

—

GPT-5.6 Luna

Feb 2026

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Atria Dawn Preview and GPT-5.6 Luna side-by-side, then vote on the output you prefer.

Atria Dawn Preview
✓ Preferred
GPT-5.6 Luna
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs GPT-5.6 Luna.

Which is better, Atria Dawn Preview or GPT-5.6 Luna?

Atria Dawn Preview leads the LLM Stats Score 52.3 to 45.1. Atria Dawn Preview is made by Shanghai AI Laboratory and GPT-5.6 Luna 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-5.6 Luna in benchmarks?

Atria Dawn Preview scores DeepSearchQA: 96.0%, BrowseComp: 92.5%, CyberGym: 86.5%, MLE-Bench Lite: 86.2%, WideSearch: 81.9%. GPT-5.6 Luna scores Connectors: 99.9%, HealthBench Consensus: 95.1%, GPQA: 92.3%, Search and Function-Calling: 89.7%, Capture-the-Flag Challenges (Internal): 85.2%.

What are the context window sizes for Atria Dawn Preview and GPT-5.6 Luna?

Atria Dawn Preview supports an unknown number of tokens and GPT-5.6 Luna 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-5.6 Luna?

Key differences include LLM Stats Score (52.3 vs 45.1), 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-5.6 Luna?

Atria Dawn Preview is developed by Shanghai AI Laboratory and GPT-5.6 Luna is developed by OpenAI.

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