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Hy4 preview vs Kimi K2 Base

Hy4 preview leads the LLM Stats Score 51.0 to 13.5.

Tencent · Moonshot AI · Updated for 2026

Which is better?

Hy4 preview leads the overall LLM Stats Score 51.0 to 13.5, ranking #14 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 51.0 and ranks #14 on LLM Stats
  • your work emphasizes reasoning — 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 Kimi K2 Base

  • you are already invested in the Moonshot AI ecosystem

At a glance

The differences that matter most.

Hy4 preview
Tencent
Kimi K2 Base
Moonshot AI
Core performance indexes
LLM Stats Score
51.0
#14
13.5
#244
Reasoning
50.8
#10
12.6
#242
Coding
39.7
#14
10.6
#163
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Hy4 preview
Kimi K2 Base
Math
41.0#11
14.3#219
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Hy4 preview · 13 for Kimi K2 Base

1 shared

Hy4 preview outperforms in 1 benchmarks (GPQA), while Kimi K2 Base is better at 0 benchmarks.

Hy4 preview significantly outperforms across most benchmarks.

Mon Sep 21 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 Base has 230.0B more parameters than Hy4 preview, making it 29.9% larger.

Tencent
Hy4 preview
770.0Bparameters
Moonshot AI
Kimi K2 Base
1.0Tparameters
770.0B
Hy4 preview
1000.0B
Kimi K2 Base

License

Usage and distribution terms

Hy4 preview is licensed under Apache 2.0, while Kimi K2 Base 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 Base

MIT

Open weights

Release Timeline

When each model was launched

Hy4 preview was released on 2026-08-28, while Kimi K2 Base was released on 2025-07-11.

Hy4 preview is 14 months newer than Kimi K2 Base.

Hy4 preview

Aug 28, 2026

3 weeks ago

1.1yr newer
Kimi K2 Base

Jul 11, 2025

1.2 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 Kimi K2 Base side-by-side, then vote on the output you prefer.

Hy4 preview
✓ Preferred
Kimi K2 Base
Open in Playground

FAQ

Common questions about Hy4 preview vs Kimi K2 Base.

Which is better, Hy4 preview or Kimi K2 Base?

Hy4 preview leads the LLM Stats Score 51.0 to 13.5. Hy4 preview is made by Tencent and Kimi K2 Base 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 Base 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 Base scores C-Eval: 92.5%, GSM8k: 92.1%, MMLU-redux-2.0: 90.2%, MMLU: 87.8%, TriviaQA: 85.1%.

What are the main differences between Hy4 preview and Kimi K2 Base?

Key differences include LLM Stats Score (51.0 vs 13.5), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Hy4 preview and Kimi K2 Base?

Hy4 preview is developed by Tencent and Kimi K2 Base is developed by Moonshot AI.

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