Model Comparison

Grok 4.5 vs Nova 2 OmniWhich is better in 2026?

Comparing Grok 4.5 and Nova 2 Omni across benchmarks, pricing, and capabilities.

Verdict: Grok 4.5 vs Nova 2 Omni — which is better?

Grok 4.5 (by xAI) and Nova 2 Omni (by Amazon) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose Grok 4.5 if…

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

Choose Nova 2 Omni if…

  • you are already invested in the Amazon ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok 4.5 and Nova 2 Omnidon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Amazon
Nova 2 Omni
Input- tokens
Output- tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok 4.5 and Nova 2 Omni support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok 4.5

Text
Images
Audio
Video

Nova 2 Omni

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok 4.5

Proprietary

Closed source

Nova 2 Omni

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4.5 was released on 2026-07-16, while Nova 2 Omni was released on 2025-12-02.

Grok 4.5 is 8 months newer than Nova 2 Omni.

Grok 4.5

Jul 16, 2026

5 days ago

7mo newer
Nova 2 Omni

Dec 2, 2025

7 months ago

Knowledge Cutoff

When training data ends

Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Nova 2 Omni's cutoff date is not specified.

We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Nova 2 Omni's cutoff date.

Grok 4.5

Feb 2026

Nova 2 Omni

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (500,000 tokens)
Amazon

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok 4.5 and Nova 2 Omni side-by-side, then vote on the output you prefer.

Grok 4.5
✓ Preferred
Nova 2 Omni
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4.5
Amazon
Nova 2 Omni

FAQ

Common questions about Grok 4.5 vs Nova 2 Omni.

Which is better, Grok 4.5 or Nova 2 Omni?

Grok 4.5 (xAI) and Nova 2 Omni (Amazon) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Grok 4.5 compare to Nova 2 Omni in benchmarks?

Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%. Nova 2 Omni scores AIME 2025: 92.1%, RefCOCOg: 86.3%, ScreenSpot: 85.4%, MMLU-Pro: 80.7%, Tau2 Telecom: 80.0%.

What are the context window sizes for Grok 4.5 and Nova 2 Omni?

Grok 4.5 supports 500K tokens and Nova 2 Omni supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok 4.5 and Nova 2 Omni?

Grok 4.5 is developed by xAI and Nova 2 Omni is developed by Amazon.

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