Model Comparison

Grok-3 vs Kimi K2 Base

Grok-3 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok-3 outperforms in 1 benchmarks (GPQA), while Kimi K2 Base is better at 0 benchmarks.

Grok-3 significantly outperforms across most benchmarks.

Thu May 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok-3 specifies input context (128,000 tokens). Only Grok-3 specifies output context (8,000 tokens).

xAI
Grok-3
Input128,000 tokens
Output8,000 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Thu May 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok-3 supports multimodal inputs, whereas Kimi K2 Base does not.

Grok-3 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-3

Text
Images
Audio
Video

Kimi K2 Base

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-3 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-3

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

Grok-3 was released on 2025-02-17, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 5 months newer than Grok-3.

Grok-3

Feb 17, 2025

1.2 years ago

Kimi K2 Base

Jul 11, 2025

10 months ago

4mo newer

Knowledge Cutoff

When training data ends

Grok-3 has a documented knowledge cutoff of 2024-11-17, while Kimi K2 Base's cutoff date is not specified.

We can confirm Grok-3's training data extends to 2024-11-17, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

Grok-3

Nov 2024

Kimi K2 Base

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Outputs Comparison

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Key Takeaways

xAI
Larger context window (128,000 tokens)
Supports multimodal inputs
Higher GPQA score (84.6% vs 48.1%)
Moonshot AI
Has open weights
xAIGrok-3
Moonshot AIKimi K2 Base
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-3
Moonshot AI
Kimi K2 Base

FAQ

Common questions about Grok-3 vs Kimi K2 Base.

Which is better, Grok-3 or Kimi K2 Base?

Grok-3 significantly outperforms across most benchmarks. Grok-3 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-3 compare to Kimi K2 Base in benchmarks?

Grok-3 scores AIME 2024: 93.3%, AIME 2025: 93.3%, GPQA: 84.6%, LiveCodeBench: 79.4%, MMMU: 78.0%. 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-3 and Kimi K2 Base?

Grok-3 supports 128K 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-3 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-3 and Kimi K2 Base?

Grok-3 is developed by xAI and Kimi K2 Base is developed by Moonshot AI.