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Hy4 preview vs Muse Spark Open

Hy4 preview and Muse Spark Open are closely matched at 49.6 and 45.3 on the LLM Stats Score.

Tencent · Meta · Updated for 2026

Which is better?

Hy4 preview and Muse Spark Open are closely matched on the overall LLM Stats Score at 49.6 and 45.3.

In the 5 individual benchmarks reported for both models, Hy4 preview wins 3; 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

  • you value its reported benchmark strengths — it wins 3 of 5 exact shared results

Choose Muse Spark Open

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

At a glance

The differences that matter most.

Hy4 preview
Tencent
Muse Spark Open
Meta
Core performance indexes
LLM Stats Score
49.6
#23
45.3
#42
Reasoning
49.8
#15
45.7
#35
Coding
37.0
#26
33.5
#40
Agents
34.8
#27
30.8
#43
Cost, coverage & limits
Benchmark wins
3 of 5
2 of 5
Input price
— / M
$1.25 / M
Output price
— / M
$4.25 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Hy4 preview
Muse Spark Open
Math
38.5#26
33.3#58
Tool use
28.9#20
23.3#45
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 17 for Muse Spark Open

5 shared

Hy4 preview outperforms in 3 benchmarks (GDPval-AA, GPQA, Terminal-Bench 2.1), while Muse Spark Open is better at 2 benchmarks (Job Bench, MCP Atlas).

Hy4 preview has a slight edge in benchmark performance.

Thu Oct 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

46.0B diff

Muse Spark Open has 46.0B more parameters than Hy4 preview, making it 6.0% larger.

Tencent
Hy4 preview
770.0Bparameters
Meta
Muse Spark Open
816.0Bparameters
770.0B
Hy4 preview
816.0B
Muse Spark Open

Context Window

Maximum input and output token capacity

Only Muse Spark Open specifies input context (1,048,576 tokens). Only Muse Spark Open specifies output context (1,048,576 tokens).

Tencent
Hy4 preview
Input- tokens
Output- tokens
Meta
Muse Spark Open
Input1,048,576 tokens
Output1,048,576 tokens
Thu Oct 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Muse Spark Open supports multimodal inputs, whereas Hy4 preview does not.

Muse Spark Open can handle both text and other forms of data like images, making it suitable for multimodal applications.

Hy4 preview

Text
Images
Audio
Video

Muse Spark Open

Text
Images
Audio
Video

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Muse Spark Open uses Muse Model License.

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

Hy4 preview

Apache 2.0

Open weights

Muse Spark Open

Muse Model License

Open weights

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Muse Spark Open was released on 2026-10-15.

Muse Spark Open is 2 months newer than Hy4 preview.

Hy4 preview

Aug 28, 2026

1 months ago

Muse Spark Open

Oct 15, 2026

4 days ago

1mo 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?

Judge for yourself.

Run your own prompts against Hy4 preview and Muse Spark Open side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Muse Spark Open
Open in Playground

FAQ

Common questions about Hy4 preview vs Muse Spark Open.

Which is better, Hy4 preview or Muse Spark Open?

Hy4 preview and Muse Spark Open are closely matched on the LLM Stats Score at 49.6 and 45.3. Hy4 preview is made by Tencent and Muse Spark Open is made by Meta. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Hy4 preview compare to Muse Spark Open 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%. Muse Spark Open scores MCP Atlas: 89.2%, GPQA: 89.0%, OSWorld-Verified: 80.4%, BabyVision: 80.2%, Terminal-Bench 2.1: 76.4%.

What are the context window sizes for Hy4 preview and Muse Spark Open?

Hy4 preview supports an unknown number of tokens and Muse Spark Open supports 1.0M 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 Muse Spark Open?

Key differences include LLM Stats Score (49.6 vs 45.3), multimodal support (no vs yes), licensing (Apache 2.0 vs Muse Model License). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and Muse Spark Open?

Hy4 preview is developed by Tencent and Muse Spark Open is developed by Meta.

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