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Hy4 preview vs LongCat-Flash-Chat

Hy4 preview leads the LLM Stats Score 51.5 to 20.1.

Tencent · Meituan · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.5 to 20.1, ranking #10 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 51.5 and ranks #10 on LLM Stats
  • your work emphasizes reasoning and coding — 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

Choose LongCat-Flash-Chat

  • you want predictable pricing at $0.30/M input and $1.20/M output

At a glance

The differences that matter most.

Hy4 preview
Tencent
LongCat-Flash-Chat
Meituan
Core performance indexes
LLM Stats Score
51.5
#10
20.1
#183
Reasoning
51.2
#8
20.0
#179
Coding
40.9
#10
12.6
#132
Agents
37.1
#11
9.4
#115
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
— / M
$0.30 / M
Output price
— / M
$1.20 / M
Context window
—
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Hy4 preview
LongCat-Flash-Chat
Math
40.3#12
19.2#161
Tool use
32.6#7
9.7#123
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 16 for LongCat-Flash-Chat

1 shared

Hy4 preview outperforms in 1 benchmarks (GPQA), while LongCat-Flash-Chat is better at 0 benchmarks.

Hy4 preview significantly outperforms across most benchmarks.

Mon Aug 31 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

210.0B diff

Hy4 preview has 210.0B more parameters than LongCat-Flash-Chat, making it 37.5% larger.

Tencent
Hy4 preview
770.0Bparameters
Meituan
LongCat-Flash-Chat
560.0Bparameters
770.0B
Hy4 preview
560.0B
LongCat-Flash-Chat

Context Window

Maximum input and output token capacity

Only LongCat-Flash-Chat specifies input context (128,000 tokens). Only LongCat-Flash-Chat specifies output context (128,000 tokens).

Tencent
Hy4 preview
Input- tokens
Output- tokens
Meituan
LongCat-Flash-Chat
Input128,000 tokens
Output128,000 tokens
Mon Aug 31 2026 • llm-stats.com

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while LongCat-Flash-Chat uses MIT.

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

Hy4 preview

Apache 2.0

Open weights

LongCat-Flash-Chat

MIT

Open weights

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while LongCat-Flash-Chat was released on 2025-08-29.

Hy4 preview is 12 months newer than LongCat-Flash-Chat.

Hy4 preview

Aug 28, 2026

2 days ago

12mo newer
LongCat-Flash-Chat

Aug 29, 2025

1.0 years 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 LongCat-Flash-Chat side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
LongCat-Flash-Chat
Open in Playground

FAQ

Common questions about Hy4 preview vs LongCat-Flash-Chat.

Which is better, Hy4 preview or LongCat-Flash-Chat?

Hy4 preview leads the LLM Stats Score 51.5 to 20.1. Hy4 preview is made by Tencent and LongCat-Flash-Chat is made by Meituan. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Hy4 preview compare to LongCat-Flash-Chat 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%. LongCat-Flash-Chat scores MATH-500: 96.4%, MMLU: 89.7%, IFEval: 89.6%, ZebraLogic: 89.3%, HumanEval: 88.4%.

What are the context window sizes for Hy4 preview and LongCat-Flash-Chat?

Hy4 preview supports an unknown number of tokens and LongCat-Flash-Chat supports 128K 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 LongCat-Flash-Chat?

Key differences include LLM Stats Score (51.5 vs 20.1), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and LongCat-Flash-Chat?

Hy4 preview is developed by Tencent and LongCat-Flash-Chat is developed by Meituan.

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