Model Comparison

Gemini 3.5 Flash Cyber vs Grok-4 HeavyWhich is better in 2026?

Comparing Gemini 3.5 Flash Cyber and Grok-4 Heavy across benchmarks, pricing, and capabilities.

Verdict: Gemini 3.5 Flash Cyber vs Grok-4 Heavy — which is better?

Gemini 3.5 Flash Cyber (by Google) and Grok-4 Heavy (by xAI) 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 Gemini 3.5 Flash Cyber if…

  • you are already invested in the Google ecosystem

Choose Grok-4 Heavy if…

  • you are already invested in the xAI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.5 Flash Cyber and Grok-4 Heavydon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Grok-4 Heavy supports multimodal inputs, whereas Gemini 3.5 Flash Cyber does not.

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

Gemini 3.5 Flash Cyber

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 3.5 Flash Cyber

Proprietary

Closed source

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.5 Flash Cyber was released on 2026-07-21, while Grok-4 Heavy's release date is not specified.

We can confirm Gemini 3.5 Flash Cyber's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Gemini 3.5 Flash Cyber

Jul 21, 2026

0 days ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Gemini 3.5 Flash Cyber'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 Gemini 3.5 Flash Cyber's cutoff date.

Gemini 3.5 Flash Cyber

—

Grok-4 Heavy

Dec 2024

Outputs Comparison

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Key Takeaways

Google

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

xAI
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.5 Flash Cyber and Grok-4 Heavy side-by-side, then vote on the output you prefer.

Gemini 3.5 Flash Cyber
✓ Preferred
Grok-4 Heavy
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.5 Flash Cyber
xAI
Grok-4 Heavy

FAQ

Common questions about Gemini 3.5 Flash Cyber vs Grok-4 Heavy.

Which is better, Gemini 3.5 Flash Cyber or Grok-4 Heavy?

Gemini 3.5 Flash Cyber (Google) and Grok-4 Heavy (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 Gemini 3.5 Flash Cyber compare to Grok-4 Heavy in benchmarks?

Gemini 3.5 Flash Cyber scores CyberGym: 83.2%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the main differences between Gemini 3.5 Flash Cyber and Grok-4 Heavy?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.5 Flash Cyber and Grok-4 Heavy?

Gemini 3.5 Flash Cyber is developed by Google and Grok-4 Heavy is developed by xAI.

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