Model Comparison

Gemini 3.1 Pro vs U2 Preview

Comparing Gemini 3.1 Pro and U2 Preview 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 U2 Preview don'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 Gemini 3.1 Pro specifies input context (1,048,576 tokens). Only Gemini 3.1 Pro specifies output context (65,536 tokens).

Google
Gemini 3.1 Pro
Input1,048,576 tokens
Output65,536 tokens
Unisound
U2 Preview
Input- tokens
Output- tokens
Thu May 28 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Pro and U2 Preview 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

U2 Preview

Text
Images
Audio
Video

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while U2 Preview was released on 2026-05-28.

U2 Preview is 3 months newer than Gemini 3.1 Pro.

Gemini 3.1 Pro

Feb 19, 2026

3 months ago

U2 Preview

May 28, 2026

0 days ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a documented knowledge cutoff of 2025-01-31, while U2 Preview'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 U2 Preview's cutoff date.

Gemini 3.1 Pro

Jan 2025

U2 Preview

—

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Unisound
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3.1 Pro
Unisound
U2 Preview

FAQ

Common questions about Gemini 3.1 Pro vs U2 Preview.

Which is better, Gemini 3.1 Pro or U2 Preview?

Gemini 3.1 Pro (Google) and U2 Preview (Unisound) 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 3.1 Pro compare to U2 Preview in benchmarks?

Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%.

What are the context window sizes for Gemini 3.1 Pro and U2 Preview?

Gemini 3.1 Pro supports 1.0M tokens and U2 Preview supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.1 Pro and U2 Preview?

Key differences include licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.1 Pro and U2 Preview?

Gemini 3.1 Pro is developed by Google and U2 Preview is developed by Unisound.