Model Comparison

Grok 4.5 vs Nova 2 ProWhich is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

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

Grok 4.5 (by xAI) and Nova 2 Pro (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.

Grok 4.5 outperforms in 1 benchmarks (GPQA), while Nova 2 Pro is better at 0 benchmarks. Grok 4.5 significantly outperforms across most benchmarks.

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose Nova 2 Pro if…

  • you are already invested in the Amazon ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok 4.5 outperforms in 1 benchmarks (GPQA), while Nova 2 Pro is better at 0 benchmarks.

Grok 4.5 significantly outperforms across most benchmarks.

Tue Jul 21 2026 • llm-stats.com

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 Pro
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 Pro 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 Pro

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 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

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

Grok 4.5 is 8 months newer than Nova 2 Pro.

Grok 4.5

Jul 16, 2026

5 days ago

7mo newer
Nova 2 Pro

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 Pro'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 Pro's cutoff date.

Grok 4.5

Feb 2026

Nova 2 Pro

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (500,000 tokens)
Higher GPQA score (93.0% vs 81.4%)
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 Pro side-by-side, then vote on the output you prefer.

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

FAQ

Common questions about Grok 4.5 vs Nova 2 Pro.

Which is better, Grok 4.5 or Nova 2 Pro?

Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is made by xAI and Nova 2 Pro is made by Amazon. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4.5 compare to Nova 2 Pro 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 Pro scores Tau2 Telecom: 92.7%, AIME 2025: 92.3%, ScreenSpot: 88.1%, LongCodeBench: 84.0%, MMLU-Pro: 81.6%.

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

Grok 4.5 supports 500K tokens and Nova 2 Pro 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 Pro?

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

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