Model Comparison

Grok Code Fast 1 vs Kimi K2-Thinking-0905

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. Grok Code Fast 1 is 1.6x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok Code Fast 1 outperforms in 0 benchmarks, while Kimi K2-Thinking-0905 is better at 1 benchmark (SWE-Bench Verified).

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks.

Mon Jun 01 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok Code Fast 1 costs less

For input processing, Grok Code Fast 1 ($0.20/1M tokens) is 2.3x cheaper than Kimi K2-Thinking-0905 ($0.47/1M tokens).

For output processing, Grok Code Fast 1 ($1.50/1M tokens) is 1.3x cheaper than Kimi K2-Thinking-0905 ($2.00/1M tokens).

In conclusion, Kimi K2-Thinking-0905 is more expensive than Grok Code Fast 1.*

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

Lowest available price from all providers

Mon Jun 01 2026 • llm-stats.com

Grok Code Fast 1

Input tokens$0.20

Output tokens$1.50

Best providerxAI

Kimi K2-Thinking-0905

Input tokens$0.47

Output tokens$2.00

Best providerDeepinfra

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K2-Thinking-0905 accepts 262,144 input tokens compared to Grok Code Fast 1's 256,000 tokens. Kimi K2-Thinking-0905 can generate longer responses up to 262,144 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.

Grok Code Fast 1

Input256,000 tokens

Output10,000 tokens

Kimi K2-Thinking-0905

Input262,144 tokens

Output262,144 tokens

Mon Jun 01 2026 • llm-stats.com

License

Usage and distribution terms

Grok Code Fast 1 is licensed under a proprietary license, while Kimi K2-Thinking-0905 uses MIT.

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

Grok Code Fast 1

Proprietary

Closed source

Kimi K2-Thinking-0905

MIT

Open weights

Release Timeline

When each model was launched

Grok Code Fast 1 was released on 2025-08-28, while Kimi K2-Thinking-0905 was released on 2025-09-05.

Kimi K2-Thinking-0905 is 0 month newer than Grok Code Fast 1.

Grok Code Fast 1

Aug 28, 2025

9 months ago

Kimi K2-Thinking-0905

Sep 5, 2025

8 months ago

1w 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

Grok Code Fast 1 is available from xAI. Kimi K2-Thinking-0905 is available from DeepInfra, Novita, Fireworks.

Grok Code Fast 1

xAI

Input Price:Input: $0.20/1MOutput Price:Output: $1.50/1M

Kimi K2-Thinking-0905

Deepinfra

Input Price:Input: $0.47/1MOutput Price:Output: $2.00/1M

Novita

Input Price:Input: $0.48/1MOutput Price:Output: $2.00/1M

Fireworks

Input Price:Input: $0.60/1MOutput Price:Output: $2.50/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Grok Code Fast 1

View details

xAI

Less expensive input tokens

Less expensive output tokens

Kimi K2-Thinking-0905

View details

Moonshot AI

Larger context window (262,144 tokens)

Has open weights

Higher SWE-Bench Verified score (71.3% vs 70.8%)

Detailed Comparison

AI Model Comparison Table
Feature	Grok Code Fast 1	Kimi K2-Thinking-0905

FAQ

Common questions about Grok Code Fast 1 vs Kimi K2-Thinking-0905.

Which is better, Grok Code Fast 1 or Kimi K2-Thinking-0905?

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. Grok Code Fast 1 is made by xAI and Kimi K2-Thinking-0905 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok Code Fast 1 compare to Kimi K2-Thinking-0905 in benchmarks?

Grok Code Fast 1 scores SWE-Bench Verified: 70.8%. Kimi K2-Thinking-0905 scores AIME 2025: 100.0%, HMMT 2025: 97.5%, MMLU-Redux: 94.4%, FRAMES: 87.0%, MMLU-Pro: 84.6%.

Is Grok Code Fast 1 cheaper than Kimi K2-Thinking-0905?

Grok Code Fast 1 is 2.3x cheaper for input tokens. Grok Code Fast 1 costs $0.20/M input and $1.50/M output via xai. Kimi K2-Thinking-0905 costs $0.47/M input and $2.00/M output via deepinfra.

What are the context window sizes for Grok Code Fast 1 and Kimi K2-Thinking-0905?

Grok Code Fast 1 supports 256K tokens and Kimi K2-Thinking-0905 supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok Code Fast 1 and Kimi K2-Thinking-0905?

Key differences include context window (256K vs 262K), input pricing ($0.20 vs $0.47/M), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok Code Fast 1 and Kimi K2-Thinking-0905?

Grok Code Fast 1 is developed by xAI and Kimi K2-Thinking-0905 is developed by Moonshot AI.