Model Comparison

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

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

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

Gemini 3.5 Flash Cyber (by Google) and Grok 4 Fast (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 want the most recent training data — it shipped Jul 2026

Choose Grok 4 Fast if…

  • you want predictable pricing at $0.20/M input and $0.50/M output

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.5 Flash Cyber and Grok 4 Fastdon'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 Fast specifies input context (2,000,000 tokens). Only Grok 4 Fast specifies output context (30,000 tokens).

Google
Gemini 3.5 Flash Cyber
Input- tokens
Output- tokens
xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Grok 4 Fast 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 Fast

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 Fast

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.5 Flash Cyber was released on 2026-07-21, while Grok 4 Fast was released on 2025-08-28.

Gemini 3.5 Flash Cyber is 11 months newer than Grok 4 Fast.

Gemini 3.5 Flash Cyber

Jul 21, 2026

0 days ago

10mo newer
Grok 4 Fast

Aug 28, 2025

10 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google

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

xAI
Larger context window (2,000,000 tokens)
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

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

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

FAQ

Common questions about Gemini 3.5 Flash Cyber vs Grok 4 Fast.

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

Gemini 3.5 Flash Cyber (Google) and Grok 4 Fast (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 Fast in benchmarks?

Gemini 3.5 Flash Cyber scores CyberGym: 83.2%. Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%.

What are the context window sizes for Gemini 3.5 Flash Cyber and Grok 4 Fast?

Gemini 3.5 Flash Cyber supports an unknown number of tokens and Grok 4 Fast supports 2.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

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

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 Fast?

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

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