Model Comparison

Grok-4 vs Kimi-k1.5

Comparing Grok-4 and Kimi-k1.5 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok-4 and Kimi-k1.5 don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

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-k1.5
Input- tokens
Output- tokens
Sun May 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-4 and Kimi-k1.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok-4

Text
Images
Audio
Video

Kimi-k1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok-4

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-4 was released on 2025-07-09, while Kimi-k1.5 was released on 2025-01-20.

Grok-4 is 6 months newer than Kimi-k1.5.

Grok-4

Jul 9, 2025

10 months ago

5mo newer
Kimi-k1.5

Jan 20, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

Grok-4 has a documented knowledge cutoff of 2024-12-31, while Kimi-k1.5'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-k1.5's cutoff date.

Grok-4

Dec 2024

Kimi-k1.5

—

Outputs Comparison

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Key Takeaways

xAI
Larger context window (256,000 tokens)
Moonshot AI

No standout differentiators in the data we have for this pair.

xAIGrok-4
Moonshot AIKimi-k1.5
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Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-4
Moonshot AI
Kimi-k1.5

FAQ

Common questions about Grok-4 vs Kimi-k1.5.

Which is better, Grok-4 or Kimi-k1.5?

Grok-4 (xAI) and Kimi-k1.5 (Moonshot AI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Grok-4 compare to Kimi-k1.5 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-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%.

What are the context window sizes for Grok-4 and Kimi-k1.5?

Grok-4 supports 256K tokens and Kimi-k1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok-4 and Kimi-k1.5?

Grok-4 is developed by xAI and Kimi-k1.5 is developed by Moonshot AI.