Model Comparison

Kimi K2.5 vs Grok-4.20 Beta Reasoning

Comparing Kimi K2.5 and Grok-4.20 Beta Reasoning 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-4.20 Beta Reasoning 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 3.3x cheaper than Grok-4.20 Beta Reasoning ($2.00/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 2.0x cheaper than Grok-4.20 Beta Reasoning ($6.00/1M tokens).

In conclusion, Grok-4.20 Beta Reasoning is more expensive than Kimi K2.5.*

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

Lowest available price from all providers
Sat Apr 18 2026 • llm-stats.com
Moonshot AI
Kimi K2.5
Input tokens$0.60
Output tokens$3.00
Best providerFireworks
xAI
Grok-4.20 Beta Reasoning
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Kimi K2.5's 262,100 tokens. Kimi K2.5 can generate longer responses up to 262,100 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.

Moonshot AI
Kimi K2.5
Input262,100 tokens
Output262,100 tokens
xAI
Grok-4.20 Beta Reasoning
Input2,000,000 tokens
Output30,000 tokens
Sat Apr 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and Grok-4.20 Beta Reasoning support multimodal inputs.

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

Kimi K2.5

Text
Images
Audio
Video

Grok-4.20 Beta Reasoning

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while Grok-4.20 Beta Reasoning 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-4.20 Beta Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while Grok-4.20 Beta Reasoning was released on 2026-03-09.

Grok-4.20 Beta Reasoning is 1 month newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

2 months ago

Grok-4.20 Beta Reasoning

Mar 9, 2026

1 months ago

1mo 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-4.20 Beta Reasoning 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-4.20 Beta Reasoning

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Moonshot AI
Less expensive input tokens
Less expensive output tokens
Has open weights
xAI
Larger context window (2,000,000 tokens)

Detailed Comparison

AI Model Comparison Table
Feature
Moonshot AI
Kimi K2.5
xAI
Grok-4.20 Beta Reasoning

FAQ

Common questions about Kimi K2.5 vs Grok-4.20 Beta Reasoning

Kimi K2.5 (Moonshot AI) and Grok-4.20 Beta Reasoning (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%.
Kimi K2.5 is 3.3x cheaper for input tokens. Kimi K2.5 costs $0.60/M input and $3.00/M output via fireworks. Grok-4.20 Beta Reasoning costs $2.00/M input and $6.00/M output via xai.
Kimi K2.5 supports 262K tokens and Grok-4.20 Beta Reasoning supports 2.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (262K vs 2.0M), input pricing ($0.60 vs $2.00/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.
Kimi K2.5 is developed by Moonshot AI and Grok-4.20 Beta Reasoning is developed by xAI.