The AI arena is free today

Open Superagent

Hy4 preview vs Kimi K2-Instruct-0905

Hy4 preview leads the LLM Stats Score 51.1 to 21.7.

Tencent · Moonshot AI · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.1 to 21.7, ranking #14 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 51.1 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 2 of 2 exact shared results
  • you want the most recent training data — it shipped Aug 2026

Choose Kimi K2-Instruct-0905

  • you are already invested in the Moonshot AI ecosystem

At a glance

The differences that matter most.

Hy4 preview
Tencent
Kimi K2-Instruct-0905
Moonshot AI
Core performance indexes
LLM Stats Score
51.1
#14
21.7
#176
Reasoning
50.7
#11
22.0
#164
Coding
39.8
#12
10.0
#159
Agents
36.3
#14
-4.2
#169
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
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
Kimi K2-Instruct-0905
Math
39.4#17
21.8#137
Tool use
31.1#10
7.4#135
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 29 for Kimi K2-Instruct-0905

2 shared

Hy4 preview outperforms in 2 benchmarks (GPQA, SWE-bench Multilingual), while Kimi K2-Instruct-0905 is better at 0 benchmarks.

Hy4 preview significantly outperforms across most benchmarks.

Fri Sep 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

230.0B diff

Kimi K2-Instruct-0905 has 230.0B more parameters than Hy4 preview, making it 29.9% larger.

Tencent
Hy4 preview
770.0Bparameters
Moonshot AI
Kimi K2-Instruct-0905
1.0Tparameters
770.0B
Hy4 preview
1000.0B
Kimi K2-Instruct-0905

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Kimi K2-Instruct-0905 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

Kimi K2-Instruct-0905

MIT

Open weights

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Kimi K2-Instruct-0905 was released on 2025-09-05.

Hy4 preview is 12 months newer than Kimi K2-Instruct-0905.

Hy4 preview

Aug 28, 2026

6 days ago

11mo newer
Kimi K2-Instruct-0905

Sep 5, 2025

12 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 Kimi K2-Instruct-0905 side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Kimi K2-Instruct-0905
Open in Playground

FAQ

Common questions about Hy4 preview vs Kimi K2-Instruct-0905.

Which is better, Hy4 preview or Kimi K2-Instruct-0905?

Hy4 preview leads the LLM Stats Score 51.1 to 21.7. Hy4 preview is made by Tencent and Kimi K2-Instruct-0905 is made by Moonshot AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Hy4 preview compare to Kimi K2-Instruct-0905 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%. Kimi K2-Instruct-0905 scores MATH-500: 97.4%, MMLU-Redux: 92.7%, IFEval: 89.8%, AutoLogi: 89.5%, MMLU: 89.5%.

What are the main differences between Hy4 preview and Kimi K2-Instruct-0905?

Key differences include LLM Stats Score (51.1 vs 21.7), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and Kimi K2-Instruct-0905?

Hy4 preview is developed by Tencent and Kimi K2-Instruct-0905 is developed by Moonshot AI.

Related comparisons