Model Comparison

Gemini 3.6 Flash vs Seed 2.1 ProWhich is better in 2026?

Gemini 3.6 Flash significantly outperforms across most benchmarks.

Verdict: Gemini 3.6 Flash vs Seed 2.1 Pro — which is better?

Gemini 3.6 Flash (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 3.6 Flash outperforms in 3 benchmarks (CharXiv-R, SWE-Bench Pro, Terminal-Bench 2.1), while Seed 2.1 Pro is better at 0 benchmarks. Gemini 3.6 Flash significantly outperforms across most benchmarks.

Choose Gemini 3.6 Flash if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose Seed 2.1 Pro if…

  • you are already invested in the ByteDance ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 3.6 Flash outperforms in 3 benchmarks (CharXiv-R, SWE-Bench Pro, Terminal-Bench 2.1), while Seed 2.1 Pro is better at 0 benchmarks.

Gemini 3.6 Flash significantly outperforms across most benchmarks.

Sun Jul 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 3.6 Flash specifies input context (1,048,576 tokens). Only Gemini 3.6 Flash specifies output context (65,536 tokens).

Google
Gemini 3.6 Flash
Input1,048,576 tokens
Output65,536 tokens
ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.6 Flash and Seed 2.1 Pro support multimodal inputs.

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

Gemini 3.6 Flash

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 3.6 Flash

Proprietary

Closed source

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.6 Flash was released on 2026-07-21, while Seed 2.1 Pro was released on 2026-06-24.

Gemini 3.6 Flash is 1 month newer than Seed 2.1 Pro.

Gemini 3.6 Flash

Jul 21, 2026

4 days ago

3w newer
Seed 2.1 Pro

Jun 24, 2026

1 months ago

Knowledge Cutoff

When training data ends

Gemini 3.6 Flash has a documented knowledge cutoff of 2026-03-31, while Seed 2.1 Pro's cutoff date is not specified.

We can confirm Gemini 3.6 Flash's training data extends to 2026-03-31, but cannot make a direct comparison without Seed 2.1 Pro's cutoff date.

Gemini 3.6 Flash

Mar 2026

Seed 2.1 Pro

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Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Higher CharXiv-R score (89.4% vs 86.4%)
Higher SWE-Bench Pro score (58.7% vs 57.5%)
Higher Terminal-Bench 2.1 score (78.0% vs 71.0%)
ByteDance

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.6 Flash and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Gemini 3.6 Flash
✓ Preferred
Seed 2.1 Pro
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.6 Flash
ByteDance
Seed 2.1 Pro

FAQ

Common questions about Gemini 3.6 Flash vs Seed 2.1 Pro.

Which is better, Gemini 3.6 Flash or Seed 2.1 Pro?

Gemini 3.6 Flash significantly outperforms across most benchmarks. Gemini 3.6 Flash 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 3.6 Flash compare to Seed 2.1 Pro in benchmarks?

Gemini 3.6 Flash scores CharXiv-R: 89.4%, OSWorld-Verified: 83.0%, Terminal-Bench 2.1: 78.0%, MLE-Bench: 63.9%, SWE-Bench Pro: 58.7%. 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 3.6 Flash and Seed 2.1 Pro?

Gemini 3.6 Flash 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 3.6 Flash and Seed 2.1 Pro?

Gemini 3.6 Flash is developed by Google and Seed 2.1 Pro is developed by ByteDance.

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