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Hy4 preview vs Seed 2.0 Pro

Hy4 preview leads the LLM Stats Score 50.7 to 39.5.

Tencent · ByteDance · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 50.7 to 39.5, ranking #15 overall.

In the 1 individual benchmarks reported for both models, Hy4 preview wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Hy4 preview

  • overall performance matters — it scores 50.7 and ranks #15 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Aug 2026
  • you need open weights you can self-host or fine-tune

Choose Seed 2.0 Pro

  • you want predictable pricing at $0.50/M input and $3.00/M output

At a glance

The differences that matter most.

Hy4 preview
Tencent
Seed 2.0 Pro
ByteDance
Core performance indexes
LLM Stats Score
50.7
#15
39.5
#60
Reasoning
50.5
#10
39.0
#59
Coding
39.2
#16
22.0
#86
Agents
36.3
#17
16.8
#80
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
— / M
$0.50 / M
Output price
— / M
$3.00 / M
Context window
—
256,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Hy4 preview
Seed 2.0 Pro
Math
41.0#11
32.2#62
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 6 for Seed 2.0 Pro

1 shared

Hy4 preview outperforms in 1 benchmarks (GPQA), while Seed 2.0 Pro is better at 0 benchmarks.

Hy4 preview significantly outperforms across most benchmarks.

Tue Sep 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Seed 2.0 Pro specifies input context (256,000 tokens). Only Seed 2.0 Pro specifies output context (131,072 tokens).

Tencent
Hy4 preview
Input- tokens
Output- tokens
ByteDance
Seed 2.0 Pro
Input256,000 tokens
Output131,072 tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Seed 2.0 Pro supports multimodal inputs, whereas Hy4 preview does not.

Seed 2.0 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Hy4 preview

Text
Images
Audio
Video

Seed 2.0 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Seed 2.0 Pro uses a proprietary license.

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

Hy4 preview

Apache 2.0

Open weights

Seed 2.0 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Seed 2.0 Pro was released on 2026-02-14.

Hy4 preview is 7 months newer than Seed 2.0 Pro.

Hy4 preview

Aug 28, 2026

3 weeks ago

6mo newer
Seed 2.0 Pro

Feb 14, 2026

7 months ago

Knowledge Cutoff

When training data ends

Seed 2.0 Pro has a documented knowledge cutoff of 2024-01-01, while Hy4 preview's cutoff date is not specified.

We can confirm Seed 2.0 Pro's training data extends to 2024-01-01, but cannot make a direct comparison without Hy4 preview's cutoff date.

Hy4 preview

—

Seed 2.0 Pro

Jan 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Hy4 preview and Seed 2.0 Pro side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Seed 2.0 Pro
Open in Playground

FAQ

Common questions about Hy4 preview vs Seed 2.0 Pro.

Which is better, Hy4 preview or Seed 2.0 Pro?

Hy4 preview leads the LLM Stats Score 50.7 to 39.5. Hy4 preview is made by Tencent and Seed 2.0 Pro is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Hy4 preview compare to Seed 2.0 Pro in benchmarks?

Hy4 preview scores GPQA: 92.3%, Terminal-Bench 2.1: 85.4%, WideSearch: 83.9%, MCP Atlas: 83.7%, SWE-bench Multilingual: 82.9%. Seed 2.0 Pro scores AIME 2025: 98.3%, AIME 2026: 94.2%, GPQA: 88.9%, LiveCodeBench v6: 87.8%, BrowseComp: 77.3%.

What are the context window sizes for Hy4 preview and Seed 2.0 Pro?

Hy4 preview supports an unknown number of tokens and Seed 2.0 Pro supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Hy4 preview and Seed 2.0 Pro?

Key differences include LLM Stats Score (50.7 vs 39.5), multimodal support (no vs yes), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and Seed 2.0 Pro?

Hy4 preview is developed by Tencent and Seed 2.0 Pro is developed by ByteDance.

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