Model Comparison

Seed 2.1 Pro vs Hy3Which is better in 2026?

Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Verdict: Seed 2.1 Pro vs Hy3 — which is better?

Seed 2.1 Pro (by ByteDance) and Hy3 (by Tencent) 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 Pro outperforms in 10 benchmarks (APEX-Agents, BrowseComp, DeepSWE, FrontierScience Olympiad, FrontierScience Research, MCP Atlas, NL2Repo, SuperChem, Toolathlon, WildClawBench), while Hy3 is better at 4 benchmarks (HorizonMath, MathArena Apex, SWE-Bench Pro, Terminal-Bench 2.1). Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Choose Seed 2.1 Pro if…

  • you want the strongest raw capability — it leads on 10 of 14 shared benchmarks

Choose Hy3 if…

  • you want the most recent training data — it shipped Jul 2026
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

14 benchmarks

Seed 2.1 Pro outperforms in 10 benchmarks (APEX-Agents, BrowseComp, DeepSWE, FrontierScience Olympiad, FrontierScience Research, MCP Atlas, NL2Repo, SuperChem, Toolathlon, WildClawBench), while Hy3 is better at 4 benchmarks (HorizonMath, MathArena Apex, SWE-Bench Pro, Terminal-Bench 2.1).

Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Seed 2.1 Pro supports multimodal inputs, whereas Hy3 does not.

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

Seed 2.1 Pro

Text
Images
Audio
Video

Hy3

Text
Images
Audio
Video

License

Usage and distribution terms

Seed 2.1 Pro is licensed under a proprietary license, while Hy3 uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

Seed 2.1 Pro

Proprietary

Closed source

Hy3

Apache 2.0

Open weights

Release Timeline

When each model was launched

Seed 2.1 Pro was released on 2026-06-24, while Hy3 was released on 2026-07-06.

Hy3 is 0 month newer than Seed 2.1 Pro.

Seed 2.1 Pro

Jun 24, 2026

3 weeks ago

Hy3

Jul 6, 2026

1 weeks ago

1w newer

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

ByteDance
Supports multimodal inputs
Higher APEX-Agents score (33.8% vs 25.6%)
Higher BrowseComp score (86.2% vs 84.2%)
Higher DeepSWE score (32.7% vs 28.0%)
Higher FrontierScience Olympiad score (75.0% vs 74.8%)
Higher FrontierScience Research score (28.3% vs 21.3%)
Higher MCP Atlas score (83.8% vs 79.1%)
Higher NL2Repo score (47.0% vs 45.6%)
Higher SuperChem score (59.8% vs 54.9%)
Higher Toolathlon score (50.6% vs 48.5%)
Higher WildClawBench score (61.7% vs 53.6%)
Tencent
Has open weights
Higher HorizonMath score (7.1% vs 2.0%)
Higher MathArena Apex score (38.7% vs 31.3%)
Higher SWE-Bench Pro score (57.9% vs 57.5%)
Higher Terminal-Bench 2.1 score (71.7% vs 71.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Seed 2.1 Pro and Hy3 side-by-side, then vote on the output you prefer.

Seed 2.1 Pro
✓ Preferred
Hy3
Open in Playground
AI Model Comparison Table
Feature
ByteDance
Seed 2.1 Pro
Tencent
Hy3

FAQ

Common questions about Seed 2.1 Pro vs Hy3.

Which is better, Seed 2.1 Pro or Hy3?

Seed 2.1 Pro shows notably better performance in the majority of benchmarks. Seed 2.1 Pro is made by ByteDance and Hy3 is made by Tencent. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Seed 2.1 Pro compare to Hy3 in benchmarks?

Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%. Hy3 scores DeepSearchQA: 91.0%, GPQA: 90.4%, IMO-AnswerBench: 90.0%, BrowseComp: 84.2%, MCP Atlas: 79.1%.

What are the main differences between Seed 2.1 Pro and Hy3?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Seed 2.1 Pro and Hy3?

Seed 2.1 Pro is developed by ByteDance and Hy3 is developed by Tencent.

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