Model Comparison

Gemini 3.1 Pro vs Grok-4.1 Fast Non-Reasoning

Comparing Gemini 3.1 Pro and Grok-4.1 Fast Non-Reasoning across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.1 Pro and Grok-4.1 Fast Non-Reasoning don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-4.1 Fast Non-Reasoning costs less

For input processing, Gemini 3.1 Pro ($2.50/1M tokens) is 12.5x more expensive than Grok-4.1 Fast Non-Reasoning ($0.20/1M tokens).

For output processing, Gemini 3.1 Pro ($15.00/1M tokens) is 30.0x more expensive than Grok-4.1 Fast Non-Reasoning ($0.50/1M tokens).

In conclusion, Gemini 3.1 Pro is more expensive than Grok-4.1 Fast Non-Reasoning.*

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

Lowest available price from all providers
Thu Apr 16 2026 • llm-stats.com
Google
Gemini 3.1 Pro
Input tokens$2.50
Output tokens$15.00
Best providerGoogle
xAI
Grok-4.1 Fast Non-Reasoning
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-4.1 Fast Non-Reasoning accepts 2,000,000 input tokens compared to Gemini 3.1 Pro's 1,048,576 tokens. Gemini 3.1 Pro can generate longer responses up to 65,536 tokens, while Grok-4.1 Fast Non-Reasoning is limited to 30,000 tokens.

Google
Gemini 3.1 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok-4.1 Fast Non-Reasoning
Input2,000,000 tokens
Output30,000 tokens
Thu Apr 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Pro and Grok-4.1 Fast Non-Reasoning support multimodal inputs.

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

Gemini 3.1 Pro

Text
Images
Audio
Video

Grok-4.1 Fast Non-Reasoning

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 3.1 Pro

Proprietary

Closed source

Grok-4.1 Fast Non-Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while Grok-4.1 Fast Non-Reasoning was released on 2025-11-17.

Gemini 3.1 Pro is 3 months newer than Grok-4.1 Fast Non-Reasoning.

Gemini 3.1 Pro

Feb 19, 2026

1 months ago

3mo newer
Grok-4.1 Fast Non-Reasoning

Nov 17, 2025

5 months ago

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a documented knowledge cutoff of 2025-01-31, while Grok-4.1 Fast Non-Reasoning's cutoff date is not specified.

We can confirm Gemini 3.1 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok-4.1 Fast Non-Reasoning's cutoff date.

Gemini 3.1 Pro

Jan 2025

Grok-4.1 Fast Non-Reasoning

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Provider Availability

Gemini 3.1 Pro is available from Google. Grok-4.1 Fast Non-Reasoning is available from xAI.

Gemini 3.1 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Grok-4.1 Fast Non-Reasoning

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
xAI
Larger context window (2,000,000 tokens)
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3.1 Pro
xAI
Grok-4.1 Fast Non-Reasoning

FAQ

Common questions about Gemini 3.1 Pro vs Grok-4.1 Fast Non-Reasoning

Gemini 3.1 Pro (Google) and Grok-4.1 Fast Non-Reasoning (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%.
Grok-4.1 Fast Non-Reasoning is 12.5x cheaper for input tokens. Gemini 3.1 Pro costs $2.50/M input and $15.00/M output via google. Grok-4.1 Fast Non-Reasoning costs $0.20/M input and $0.50/M output via xai.
Gemini 3.1 Pro supports 1.0M tokens and Grok-4.1 Fast Non-Reasoning 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 ($2.50 vs $0.20/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 3.1 Pro is developed by Google and Grok-4.1 Fast Non-Reasoning is developed by xAI.