Model Comparison

Seed 2.1 Turbo vs Gemini 3.5 FlashWhich is better in 2026?

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks.

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

Seed 2.1 Turbo (by ByteDance) and Gemini 3.5 Flash (by Google) 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.

Seed 2.1 Turbo outperforms in 2 benchmarks (Humanity's Last Exam, SWE-Bench Pro), while Gemini 3.5 Flash is better at 4 benchmarks (CharXiv-R, MCP Atlas, MMMU-Pro, Toolathlon). Gemini 3.5 Flash shows notably better performance in the majority of benchmarks.

Choose Seed 2.1 Turbo if…

  • you want the most recent training data — it shipped Jun 2026

Choose Gemini 3.5 Flash if…

  • you want the strongest raw capability — it leads on 4 of 6 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Seed 2.1 Turbo outperforms in 2 benchmarks (Humanity's Last Exam, SWE-Bench Pro), while Gemini 3.5 Flash is better at 4 benchmarks (CharXiv-R, MCP Atlas, MMMU-Pro, Toolathlon).

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 3.5 Flash specifies input context (1,048,576 tokens). Only Gemini 3.5 Flash specifies output context (65,536 tokens).

ByteDance
Seed 2.1 Turbo
Input- tokens
Output- tokens
Google
Gemini 3.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Seed 2.1 Turbo and Gemini 3.5 Flash support multimodal inputs.

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

Seed 2.1 Turbo

Text
Images
Audio
Video

Gemini 3.5 Flash

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.

Seed 2.1 Turbo

Proprietary

Closed source

Gemini 3.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Seed 2.1 Turbo was released on 2026-06-24, while Gemini 3.5 Flash was released on 2026-05-19.

Seed 2.1 Turbo is 1 month newer than Gemini 3.5 Flash.

Seed 2.1 Turbo

Jun 24, 2026

3 weeks ago

1mo newer
Gemini 3.5 Flash

May 19, 2026

1 months ago

Knowledge Cutoff

When training data ends

Gemini 3.5 Flash has a documented knowledge cutoff of 2026-01-31, while Seed 2.1 Turbo's cutoff date is not specified.

We can confirm Gemini 3.5 Flash's training data extends to 2026-01-31, but cannot make a direct comparison without Seed 2.1 Turbo's cutoff date.

Seed 2.1 Turbo

—

Gemini 3.5 Flash

Jan 2026

Outputs Comparison

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Key Takeaways

ByteDance
Higher Humanity's Last Exam score (54.6% vs 40.2%)
Higher SWE-Bench Pro score (57.0% vs 55.1%)
Google
Larger context window (1,048,576 tokens)
Higher CharXiv-R score (84.2% vs 83.6%)
Higher MCP Atlas score (83.6% vs 80.3%)
Higher MMMU-Pro score (83.6% vs 82.2%)
Higher Toolathlon score (56.5% vs 49.1%)

Detailed Comparison

Interactive Arena

Judge for yourself.

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

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

FAQ

Common questions about Seed 2.1 Turbo vs Gemini 3.5 Flash.

Which is better, Seed 2.1 Turbo or Gemini 3.5 Flash?

Gemini 3.5 Flash shows notably better performance in the majority of benchmarks. Seed 2.1 Turbo is made by ByteDance and Gemini 3.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Seed 2.1 Turbo compare to Gemini 3.5 Flash in benchmarks?

Seed 2.1 Turbo scores CharXiv-D: 94.6%, MathVision: 92.7%, MathVista: 90.5%, MathVerse: 89.2%, Video-MME: 89.0%. Gemini 3.5 Flash scores CharXiv-R: 84.2%, MCP Atlas: 83.6%, MMMU-Pro: 83.6%, OSWorld-Verified: 78.4%, Terminal-Bench 2.0: 76.2%.

What are the context window sizes for Seed 2.1 Turbo and Gemini 3.5 Flash?

Seed 2.1 Turbo supports an unknown number of tokens and Gemini 3.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Seed 2.1 Turbo and Gemini 3.5 Flash?

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

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