Model Comparison

Kimi K2.5 vs Grok 4.3

Comparing Kimi K2.5 and Grok 4.3 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Kimi K2.5 and Grok 4.3 don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2.5 costs less

For input processing, Kimi K2.5 ($0.60/1M tokens) is 2.1x cheaper than Grok 4.3 ($1.25/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 1.2x more expensive than Grok 4.3 ($2.50/1M tokens).

In conclusion, Grok 4.3 is more expensive than Kimi K2.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed May 06 2026 • llm-stats.com
Moonshot AI
Kimi K2.5
Input tokens$0.60
Output tokens$3.00
Best providerFireworks
xAI
Grok 4.3
Input tokens$1.25
Output tokens$2.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4.3 accepts 1,000,000 input tokens compared to Kimi K2.5's 262,100 tokens. Only Kimi K2.5 specifies output context (262,100 tokens).

Moonshot AI
Kimi K2.5
Input262,100 tokens
Output262,100 tokens
xAI
Grok 4.3
Input1,000,000 tokens
Output- tokens
Wed May 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Kimi K2.5 supports multimodal inputs, whereas Grok 4.3 does not.

Kimi K2.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Kimi K2.5

Text
Images
Audio
Video

Grok 4.3

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while Grok 4.3 uses a proprietary license.

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

Kimi K2.5

MIT

Open weights

Grok 4.3

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while Grok 4.3 was released on 2026-05-06.

Grok 4.3 is 3 months newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

3 months ago

Grok 4.3

May 6, 2026

0 days ago

3mo newer

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

Provider Availability

Kimi K2.5 is available from Fireworks, Moonshot AI. Grok 4.3 is available from xAI.

Kimi K2.5

fireworks logo
Fireworks
Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M
moonshot logo
Unknown Organization
Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

Grok 4.3

xai logo
xAI
Input Price:Input: $1.25/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Moonshot AI
Supports multimodal inputs
Less expensive input tokens
Has open weights
xAI
Larger context window (1,000,000 tokens)
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Moonshot AI
Kimi K2.5
xAI
Grok 4.3

FAQ

Common questions about Kimi K2.5 vs Grok 4.3.

Which is better, Kimi K2.5 or Grok 4.3?

Kimi K2.5 (Moonshot AI) and Grok 4.3 (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Kimi K2.5 compare to Grok 4.3 in benchmarks?

Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%.

Is Kimi K2.5 cheaper than Grok 4.3?

Kimi K2.5 is 2.1x cheaper for input tokens. Kimi K2.5 costs $0.60/M input and $3.00/M output via fireworks. Grok 4.3 costs $1.25/M input and $2.50/M output via xai.

What are the context window sizes for Kimi K2.5 and Grok 4.3?

Kimi K2.5 supports 262K tokens and Grok 4.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2.5 and Grok 4.3?

Key differences include context window (262K vs 1.0M), input pricing ($0.60 vs $1.25/M), multimodal support (yes vs no), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.5 and Grok 4.3?

Kimi K2.5 is developed by Moonshot AI and Grok 4.3 is developed by xAI.