Model Comparison

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

Seed 2.1 Pro significantly outperforms across most benchmarks.

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

Gemini 3.5 Flash-Lite (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-Lite outperforms in 0 benchmarks, while Seed 2.1 Pro is better at 3 benchmarks (CharXiv-R, SWE-Bench Pro, Terminal-Bench 2.1). Seed 2.1 Pro significantly outperforms across most benchmarks.

Choose Gemini 3.5 Flash-Lite if…

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

Choose Seed 2.1 Pro if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 3.5 Flash-Lite outperforms in 0 benchmarks, while Seed 2.1 Pro is better at 3 benchmarks (CharXiv-R, SWE-Bench Pro, Terminal-Bench 2.1).

Seed 2.1 Pro 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 3.5 Flash-Lite specifies input context (1,048,576 tokens). Only Gemini 3.5 Flash-Lite specifies output context (65,536 tokens).

Google
Gemini 3.5 Flash-Lite
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 3.5 Flash-Lite and Seed 2.1 Pro support multimodal inputs.

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

Gemini 3.5 Flash-Lite

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-Lite

Proprietary

Closed source

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Gemini 3.5 Flash-Lite

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

We can confirm Gemini 3.5 Flash-Lite's training data extends to 2026-03-31, but cannot make a direct comparison without Seed 2.1 Pro's cutoff date.

Gemini 3.5 Flash-Lite

Mar 2026

Seed 2.1 Pro

—

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
ByteDance
Higher CharXiv-R score (86.4% vs 76.5%)
Higher SWE-Bench Pro score (57.5% vs 54.2%)
Higher Terminal-Bench 2.1 score (71.0% vs 54.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

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

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

FAQ

Common questions about Gemini 3.5 Flash-Lite vs Seed 2.1 Pro.

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

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

Gemini 3.5 Flash-Lite scores CharXiv-R: 76.5%, OSWorld-Verified: 74.0%, SWE-Bench Pro: 54.2%, Terminal-Bench 2.1: 54.0%, MLE-Bench: 39.2%. 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 context window sizes for Gemini 3.5 Flash-Lite and Seed 2.1 Pro?

Gemini 3.5 Flash-Lite 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 3.5 Flash-Lite and Seed 2.1 Pro?

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

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