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Hy4 preview vs Seed 2.1 Turbo

Hy4 preview leads the LLM Stats Score 51.0 to 43.2.

Tencent · ByteDance · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.0 to 43.2, ranking #14 overall.

In the 16 individual benchmarks reported for both models, Hy4 preview wins 13; 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 51.0 and ranks #14 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 13 of 16 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 2.1 Turbo

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

Hy4 preview
Tencent
Seed 2.1 Turbo
ByteDance
Core performance indexes
LLM Stats Score
51.0
#14
43.2
#42
Reasoning
50.8
#10
44.5
#34
Coding
39.7
#14
31.0
#46
Agents
36.7
#16
29.1
#39
Cost, coverage & limits
Benchmark wins
13 of 16
3 of 16
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Hy4 preview
Seed 2.1 Turbo
Math
41.0#11
39.7#17
Tool use
30.9#14
21.4#51
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 90 for Seed 2.1 Turbo

16 shared

Hy4 preview outperforms in 13 benchmarks (APEX-Agents, CyberGym, DeepSWE, HorizonMath, MathArena Apex, MCP Atlas, NL2Repo, PostTrainBench, SuperChem, SWE-Bench Pro, Terminal-Bench 2.1, Toolathlon, Workspace Bench), while Seed 2.1 Turbo is better at 3 benchmarks (OfficeQA Pro, OneMillion Bench, Program Bench).

Hy4 preview significantly outperforms across most benchmarks.

Sun Sep 20 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Input capabilities

Documented input modalities across available providers

Seed 2.1 Turbo supports multimodal inputs, whereas Hy4 preview does not.

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

Hy4 preview

Text
Images
Audio
Video

Seed 2.1 Turbo

Text
Images
Audio
Video

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Seed 2.1 Turbo 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 2.1 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Seed 2.1 Turbo was released on 2026-06-24.

Hy4 preview is 2 months newer than Seed 2.1 Turbo.

Hy4 preview

Aug 28, 2026

3 weeks ago

2mo newer
Seed 2.1 Turbo

Jun 24, 2026

2 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→

Judge for yourself.

Run your own prompts against Hy4 preview and Seed 2.1 Turbo side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Seed 2.1 Turbo
Open in Playground

FAQ

Common questions about Hy4 preview vs Seed 2.1 Turbo.

Which is better, Hy4 preview or Seed 2.1 Turbo?

Hy4 preview leads the LLM Stats Score 51.0 to 43.2. Hy4 preview is made by Tencent and Seed 2.1 Turbo 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 2.1 Turbo 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 2.1 Turbo scores CharXiv-D: 94.6%, MathVision: 92.7%, MathVista: 90.5%, MathVerse: 89.2%, Video-MME: 89.0%.

What are the main differences between Hy4 preview and Seed 2.1 Turbo?

Key differences include LLM Stats Score (51.0 vs 43.2), 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 2.1 Turbo?

Hy4 preview is developed by Tencent and Seed 2.1 Turbo is developed by ByteDance.

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