Model Comparison

Gemini 3.5 Flash Cyber vs Seed 2.1 ProWhich is better in 2026?

Gemini 3.5 Flash Cyber significantly outperforms across most benchmarks.

Verdict: Gemini 3.5 Flash Cyber vs Seed 2.1 Pro — which is better?

Gemini 3.5 Flash Cyber (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 3.5 Flash Cyber outperforms in 1 benchmarks (CyberGym), while Seed 2.1 Pro is better at 0 benchmarks. Gemini 3.5 Flash Cyber significantly outperforms across most benchmarks.

Choose Gemini 3.5 Flash Cyber if…

  • you want the strongest raw capability — it leads on 1 of 1 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

1 benchmarks

Gemini 3.5 Flash Cyber outperforms in 1 benchmarks (CyberGym), while Seed 2.1 Pro is better at 0 benchmarks.

Gemini 3.5 Flash Cyber significantly outperforms across most benchmarks.

Sun Jul 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Seed 2.1 Pro supports multimodal inputs, whereas Gemini 3.5 Flash Cyber does not.

Seed 2.1 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3.5 Flash Cyber

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 3.5 Flash Cyber

Proprietary

Closed source

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.5 Flash Cyber was released on 2026-07-21, while Seed 2.1 Pro was released on 2026-06-24.

Gemini 3.5 Flash Cyber is 1 month newer than Seed 2.1 Pro.

Gemini 3.5 Flash Cyber

Jul 21, 2026

4 days ago

3w newer
Seed 2.1 Pro

Jun 24, 2026

1 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Higher CyberGym score (83.2% vs 70.2%)
ByteDance
Supports multimodal inputs

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.5 Flash Cyber and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Gemini 3.5 Flash Cyber
✓ Preferred
Seed 2.1 Pro
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.5 Flash Cyber
ByteDance
Seed 2.1 Pro

FAQ

Common questions about Gemini 3.5 Flash Cyber vs Seed 2.1 Pro.

Which is better, Gemini 3.5 Flash Cyber or Seed 2.1 Pro?

Gemini 3.5 Flash Cyber significantly outperforms across most benchmarks. Gemini 3.5 Flash Cyber 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 3.5 Flash Cyber compare to Seed 2.1 Pro in benchmarks?

Gemini 3.5 Flash Cyber scores CyberGym: 83.2%. 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 main differences between Gemini 3.5 Flash Cyber and Seed 2.1 Pro?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.5 Flash Cyber and Seed 2.1 Pro?

Gemini 3.5 Flash Cyber is developed by Google and Seed 2.1 Pro is developed by ByteDance.

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