Model Comparison

Gemini 3 Pro vs Grok 4 Fast

Gemini 3 Pro shows notably better performance in the majority of benchmarks. Grok 4 Fast is 16.4x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 3 Pro outperforms in 3 benchmarks (AIME 2025, GPQA, Humanity's Last Exam), while Grok 4 Fast is better at 1 benchmark (SimpleQA).

Gemini 3 Pro shows notably better performance in the majority of benchmarks.

Tue Apr 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4 Fast costs less

For input processing, Gemini 3 Pro ($2.00/1M tokens) is 10.0x more expensive than Grok 4 Fast ($0.20/1M tokens).

For output processing, Gemini 3 Pro ($12.00/1M tokens) is 24.0x more expensive than Grok 4 Fast ($0.50/1M tokens).

In conclusion, Gemini 3 Pro is more expensive than Grok 4 Fast.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Tue Apr 21 2026 • llm-stats.com
Google
Gemini 3 Pro
Input tokens$2.00
Output tokens$12.00
Best providerGoogle
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to Gemini 3 Pro's 1,048,576 tokens. Gemini 3 Pro can generate longer responses up to 65,536 tokens, while Grok 4 Fast is limited to 30,000 tokens.

Google
Gemini 3 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Tue Apr 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Pro and Grok 4 Fast 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 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 Pro

Proprietary

Closed source

Grok 4 Fast

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while Grok 4 Fast was released on 2025-08-28.

Gemini 3 Pro is 3 months newer than Grok 4 Fast.

Gemini 3 Pro

Nov 18, 2025

5 months ago

2mo newer
Grok 4 Fast

Aug 28, 2025

7 months ago

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while Grok 4 Fast's cutoff date is not specified.

We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok 4 Fast's cutoff date.

Gemini 3 Pro

Jan 2025

Grok 4 Fast

—

Provider Availability

Gemini 3 Pro is available from Google. Grok 4 Fast is available from xAI.

Gemini 3 Pro

google logo
Google
Input Price:Input: $2.00/1MOutput Price:Output: $12.00/1M

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Higher AIME 2025 score (100.0% vs 92.0%)
Higher GPQA score (91.9% vs 85.7%)
Higher Humanity's Last Exam score (45.8% vs 20.0%)
xAI
Larger context window (2,000,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher SimpleQA score (95.0% vs 72.1%)

Detailed Comparison

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

FAQ

Common questions about Gemini 3 Pro vs Grok 4 Fast

Gemini 3 Pro shows notably better performance in the majority of benchmarks. Gemini 3 Pro is made by Google and Grok 4 Fast is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
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 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%.
Grok 4 Fast is 10.0x cheaper for input tokens. Gemini 3 Pro costs $2.00/M input and $12.00/M output via google. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai.
Gemini 3 Pro supports 1.0M 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.
Key differences include context window (1.0M vs 2.0M), input pricing ($2.00 vs $0.20/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 3 Pro is developed by Google and Grok 4 Fast is developed by xAI.