Model Comparison

Grok-4 vs Kimi K2 Base

Grok-4 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok-4 outperforms in 1 benchmarks (GPQA), while Kimi K2 Base is better at 0 benchmarks.

Grok-4 significantly outperforms across most benchmarks.

Mon Jun 01 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok-4 specifies input context (256,000 tokens). Only Grok-4 specifies output context (8,000 tokens).

xAI
Grok-4
Input256,000 tokens
Output8,000 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Mon Jun 01 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok-4 supports multimodal inputs, whereas Kimi K2 Base does not.

Grok-4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-4

Text
Images
Audio
Video

Kimi K2 Base

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 is licensed under a proprietary license, while Kimi K2 Base uses MIT.

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

Grok-4

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

Grok-4 was released on 2025-07-09, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 0 month newer than Grok-4.

Grok-4

Jul 9, 2025

10 months ago

Kimi K2 Base

Jul 11, 2025

10 months ago

2d newer

Knowledge Cutoff

When training data ends

Grok-4 has a documented knowledge cutoff of 2024-12-31, while Kimi K2 Base's cutoff date is not specified.

We can confirm Grok-4's training data extends to 2024-12-31, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

Grok-4

Dec 2024

Kimi K2 Base

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Outputs Comparison

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Key Takeaways

xAI
Larger context window (256,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.5% vs 48.1%)
Moonshot AI
Has open weights
xAIGrok-4
Moonshot AIKimi K2 Base
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Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-4
Moonshot AI
Kimi K2 Base

FAQ

Common questions about Grok-4 vs Kimi K2 Base.

Which is better, Grok-4 or Kimi K2 Base?

Grok-4 significantly outperforms across most benchmarks. Grok-4 is made by xAI and Kimi K2 Base is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-4 compare to Kimi K2 Base in benchmarks?

Grok-4 scores AIME 2025: 91.7%, HMMT25: 90.0%, GPQA: 87.5%, LiveCodeBench: 79.0%, Humanity's Last Exam: 40.0%. 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 context window sizes for Grok-4 and Kimi K2 Base?

Grok-4 supports 256K tokens and Kimi K2 Base supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-4 and Kimi K2 Base?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4 and Kimi K2 Base?

Grok-4 is developed by xAI and Kimi K2 Base is developed by Moonshot AI.