Model Comparison

Gemini 3.1 Pro vs Seed 2.1 ProWhich is better in 2026?

Seed 2.1 Pro significantly outperforms across most benchmarks.

Verdict: Gemini 3.1 Pro vs Seed 2.1 Pro — which is better?

Gemini 3.1 Pro (by Google) and Seed 2.1 Pro (by ByteDance) 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.

Gemini 3.1 Pro outperforms in 0 benchmarks, while Seed 2.1 Pro is better at 7 benchmarks (APEX-Agents, BrowseComp, Humanity's Last Exam, MCP Atlas, MMMU-Pro, SciCode, SWE-Bench Pro). Seed 2.1 Pro significantly outperforms across most benchmarks.

Choose Gemini 3.1 Pro if…

  • you want predictable pricing at $2.50/M input and $15.00/M output

Choose Seed 2.1 Pro if…

  • you want the strongest raw capability — it leads on 7 of 7 shared benchmarks
  • you want the most recent training data — it shipped Jun 2026
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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Gemini 3.1 Pro outperforms in 0 benchmarks, while Seed 2.1 Pro is better at 7 benchmarks (APEX-Agents, BrowseComp, Humanity's Last Exam, MCP Atlas, MMMU-Pro, SciCode, SWE-Bench Pro).

Seed 2.1 Pro significantly outperforms across most benchmarks.

Thu Jun 25 2026 • llm-stats.com

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
ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
Thu Jun 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.1 Pro and Seed 2.1 Pro 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

Seed 2.1 Pro

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

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while Seed 2.1 Pro was released on 2026-06-24.

Seed 2.1 Pro is 4 months newer than Gemini 3.1 Pro.

Gemini 3.1 Pro

Feb 19, 2026

4 months ago

Seed 2.1 Pro

Jun 24, 2026

1 days ago

4mo newer

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a documented knowledge cutoff of 2025-01-31, while Seed 2.1 Pro'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 Seed 2.1 Pro's cutoff date.

Gemini 3.1 Pro

Jan 2025

Seed 2.1 Pro

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Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
ByteDance
Higher APEX-Agents score (33.8% vs 33.5%)
Higher BrowseComp score (86.2% vs 85.9%)
Higher Humanity's Last Exam score (55.7% vs 51.4%)
Higher MCP Atlas score (83.8% vs 69.2%)
Higher MMMU-Pro score (82.7% vs 80.5%)
Higher SciCode score (59.8% vs 59.0%)
Higher SWE-Bench Pro score (57.5% vs 54.2%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3.1 Pro
ByteDance
Seed 2.1 Pro

FAQ

Common questions about Gemini 3.1 Pro vs Seed 2.1 Pro.

Which is better, Gemini 3.1 Pro or Seed 2.1 Pro?

Seed 2.1 Pro significantly outperforms across most benchmarks. Gemini 3.1 Pro is made by Google and Seed 2.1 Pro is made by ByteDance. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3.1 Pro compare to Seed 2.1 Pro in benchmarks?

Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%. Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%.

What are the context window sizes for Gemini 3.1 Pro and Seed 2.1 Pro?

Gemini 3.1 Pro supports 1.0M tokens and Seed 2.1 Pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Gemini 3.1 Pro and Seed 2.1 Pro?

Gemini 3.1 Pro is developed by Google and Seed 2.1 Pro is developed by ByteDance.

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