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Hy4 preview vs Mercury 3

Hy4 preview leads the LLM Stats Score 49.6 to 36.1.

Tencent · Inception · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 49.6 to 36.1, ranking #23 overall.

In the 2 individual benchmarks reported for both models, Hy4 preview wins 2; 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 49.6 and ranks #23 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you need open weights you can self-host or fine-tune

Choose Mercury 3

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

At a glance

The differences that matter most.

Hy4 preview
Tencent
Mercury 3
Inception
Core performance indexes
LLM Stats Score
49.6
#23
36.1
#98
Reasoning
49.8
#15
34.8
#103
Coding
37.0
#26
21.5
#105
Agents
34.8
#27
19.4
#84
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
— / M
$0.10 / M
Output price
— / M
$0.35 / M
Context window
—
1,000,000

Individual benchmarks

32 reported for Hy4 preview · 12 for Mercury 3

2 shared

Hy4 preview outperforms in 2 benchmarks (GDPval-AA, GPQA), while Mercury 3 is better at 0 benchmarks.

Hy4 preview significantly outperforms across most benchmarks.

Thu Oct 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 Mercury 3 specifies input context (1,000,000 tokens). Only Mercury 3 specifies output context (131,072 tokens).

Tencent
Hy4 preview
Input- tokens
Output- tokens
Inception
Mercury 3
Input1,000,000 tokens
Output131,072 tokens
Thu Oct 22 2026 • llm-stats.com

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Mercury 3 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

Mercury 3

Proprietary

Closed source

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Mercury 3 was released on 2026-10-19.

Mercury 3 is 2 months newer than Hy4 preview.

Hy4 preview

Aug 28, 2026

1 months ago

Mercury 3

Oct 19, 2026

3 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 Mercury 3 side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Mercury 3
Open in Playground

FAQ

Common questions about Hy4 preview vs Mercury 3.

Which is better, Hy4 preview or Mercury 3?

Hy4 preview leads the LLM Stats Score 49.6 to 36.1. Hy4 preview is made by Tencent and Mercury 3 is made by Inception. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Hy4 preview compare to Mercury 3 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%. Mercury 3 scores GPQA: 89.2%, AA-LCR: 77.7%, IFBench: 76.8%, MRCR v2: 75.5%, DeepSearchQA: 71.3%.

What are the context window sizes for Hy4 preview and Mercury 3?

Hy4 preview supports an unknown number of tokens and Mercury 3 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 Mercury 3?

Key differences include LLM Stats Score (49.6 vs 36.1), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and Mercury 3?

Hy4 preview is developed by Tencent and Mercury 3 is developed by Inception.

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