Model Comparison

Grok-4 Heavy vs Nova ProWhich is better in 2026?

Grok-4 Heavy significantly outperforms across most benchmarks.

Verdict: Grok-4 Heavy vs Nova Pro — which is better?

Grok-4 Heavy (by xAI) and Nova 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 Heavy outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks. Grok-4 Heavy significantly outperforms across most benchmarks.

Choose Grok-4 Heavy if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks

Choose Nova Pro if…

  • you want predictable pricing at $0.80/M input and $3.20/M output

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok-4 Heavy outperforms in 1 benchmarks (GPQA), while Nova Pro is better at 0 benchmarks.

Grok-4 Heavy significantly outperforms across most benchmarks.

Sat Jun 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Nova Pro specifies input context (300,000 tokens). Only Nova Pro specifies output context (300,000 tokens).

xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Amazon
Nova Pro
Input300,000 tokens
Output300,000 tokens
Sat Jun 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-4 Heavy and Nova Pro support multimodal inputs.

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

Grok-4 Heavy

Text
Images
Audio
Video

Nova 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 Heavy

Proprietary

Closed source

Nova Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Nova Pro was released on 2024-11-20, while Grok-4 Heavy's release date is not specified.

We can confirm Nova Pro's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Grok-4 Heavy

—

Nova Pro

Nov 20, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Nova Pro's cutoff date is not specified.

We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without Nova Pro's cutoff date.

Grok-4 Heavy

Dec 2024

Nova Pro

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Higher GPQA score (88.4% vs 46.9%)
Amazon
Larger context window (300,000 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok-4 Heavy and Nova Pro side-by-side, then vote on the output you prefer.

Grok-4 Heavy
✓ Preferred
Nova Pro
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok-4 Heavy
Amazon
Nova Pro

FAQ

Common questions about Grok-4 Heavy vs Nova Pro.

Which is better, Grok-4 Heavy or Nova Pro?

Grok-4 Heavy significantly outperforms across most benchmarks. Grok-4 Heavy is made by xAI and Nova 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 Heavy compare to Nova Pro in benchmarks?

Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%. Nova Pro scores ARC-C: 94.8%, GSM8k: 94.8%, DocVQA: 93.5%, IFEval: 92.1%, ChartQA: 89.2%.

What are the context window sizes for Grok-4 Heavy and Nova Pro?

Grok-4 Heavy supports an unknown number of tokens and Nova Pro supports 300K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok-4 Heavy and Nova Pro?

Grok-4 Heavy is developed by xAI and Nova Pro is developed by Amazon.

Related comparisons