Model Comparison

Gemini 3 Pro vs Grok-4 Heavy

Both models are evenly matched across the benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 3 Pro outperforms in 1 benchmarks (GPQA), while Grok-4 Heavy is better at 1 benchmark (Humanity's Last Exam).

Both models are evenly matched across the benchmarks.

Mon May 11 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 3 Pro specifies input context (1,048,576 tokens). Only Gemini 3 Pro specifies output context (65,536 tokens).

Google
Gemini 3 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Mon May 11 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Pro and Grok-4 Heavy support multimodal inputs.

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

Gemini 3 Pro

Text
Images
Audio
Video

Grok-4 Heavy

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.

Gemini 3 Pro

Proprietary

Closed source

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while Grok-4 Heavy's release date is not specified.

We can confirm Gemini 3 Pro's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Gemini 3 Pro

Nov 18, 2025

5 months ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a knowledge cutoff of 2025-01-31, while Grok-4 Heavy has a cutoff of 2024-12-31.

Gemini 3 Pro has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to Grok-4 Heavy (2024-12-31).

Gemini 3 Pro

Jan 2025

1 mo newer
Grok-4 Heavy

Dec 2024

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Higher GPQA score (91.9% vs 88.4%)
xAI
Higher Humanity's Last Exam score (50.7% vs 45.8%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Pro
xAI
Grok-4 Heavy

FAQ

Common questions about Gemini 3 Pro vs Grok-4 Heavy.

Which is better, Gemini 3 Pro or Grok-4 Heavy?

Both models are evenly matched across the benchmarks. Gemini 3 Pro is made by Google and Grok-4 Heavy is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3 Pro compare to Grok-4 Heavy in benchmarks?

Gemini 3 Pro scores AIME 2025: 100.0%, Vending-Bench 2: 100.0%, Global PIQA: 93.4%, GPQA: 91.9%, MMMLU: 91.8%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the context window sizes for Gemini 3 Pro and Grok-4 Heavy?

Gemini 3 Pro supports 1.0M tokens and Grok-4 Heavy supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Gemini 3 Pro and Grok-4 Heavy?

Gemini 3 Pro is developed by Google and Grok-4 Heavy is developed by xAI.