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Atria Dawn Preview vs Grok-4 Fast Reasoning

Comparing Atria Dawn Preview and Grok-4 Fast Reasoning across benchmarks, pricing, and capabilities.

Shanghai AI Laboratory · xAI · Updated for 2026

Which is better?

Atria Dawn Preview and Grok-4 Fast Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

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

Choose Atria Dawn Preview

  • you want the most recent training data — it shipped Sep 2026
  • you need open weights you can self-host or fine-tune

Choose Grok-4 Fast Reasoning

  • you want predictable pricing at $0.20/M input and $0.50/M output

At a glance

The differences that matter most.

Atria Dawn Preview
Shanghai AI Laboratory
Grok-4 Fast Reasoning
xAI
Benchmark wins
—
—
Input price
— / M
$0.20 / M
Output price
— / M
$0.50 / M
Context window
—
2,000,000

Individual benchmarks

12 reported for Atria Dawn Preview · 0 for Grok-4 Fast Reasoning

No common benchmarks found

Atria Dawn Preview and Grok-4 Fast Reasoningdon'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 Grok-4 Fast Reasoning specifies input context (2,000,000 tokens). Only Grok-4 Fast Reasoning specifies output context (30,000 tokens).

Shanghai AI Laboratory
Atria Dawn Preview
Input- tokens
Output- tokens
xAI
Grok-4 Fast Reasoning
Input2,000,000 tokens
Output30,000 tokens
Sun Sep 20 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Grok-4 Fast Reasoning supports multimodal inputs, whereas Atria Dawn Preview does not.

Grok-4 Fast Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.

Atria Dawn Preview

Text
Images
Audio
Video

Grok-4 Fast Reasoning

Text
Images
Audio
Video

License

Usage and distribution terms

Atria Dawn Preview is licensed under MIT, while Grok-4 Fast Reasoning 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

Grok-4 Fast Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Atria Dawn Preview was released on 2026-09-11, while Grok-4 Fast Reasoning was released on 2025-08-28.

Atria Dawn Preview is 13 months newer than Grok-4 Fast Reasoning.

Atria Dawn Preview

Sep 11, 2026

1 weeks ago

1.0yr newer
Grok-4 Fast Reasoning

Aug 28, 2025

1.1 years ago

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 Grok-4 Fast Reasoning side-by-side, then vote on the output you prefer.

Atria Dawn Preview
✓ Preferred
Grok-4 Fast Reasoning
Open in Playground

FAQ

Common questions about Atria Dawn Preview vs Grok-4 Fast Reasoning.

Which is better, Atria Dawn Preview or Grok-4 Fast Reasoning?

Atria Dawn Preview (Shanghai AI Laboratory) and Grok-4 Fast Reasoning (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Atria Dawn Preview compare to Grok-4 Fast Reasoning in benchmarks?

Atria Dawn Preview scores DeepSearchQA: 96.0%, BrowseComp: 92.5%, CyberGym: 86.5%, MLE-Bench Lite: 86.2%, WideSearch: 81.9%.

What are the context window sizes for Atria Dawn Preview and Grok-4 Fast Reasoning?

Atria Dawn Preview supports an unknown number of tokens and Grok-4 Fast Reasoning supports 2.0M 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 Grok-4 Fast Reasoning?

Key differences include 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 Grok-4 Fast Reasoning?

Atria Dawn Preview is developed by Shanghai AI Laboratory and Grok-4 Fast Reasoning is developed by xAI.

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