Model Comparison

Grok-2 vs Kimi K2 Instruct

Kimi K2 Instruct significantly outperforms across most benchmarks. Kimi K2 Instruct is 8.0x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Grok-2 outperforms in 0 benchmarks, while Kimi K2 Instruct is better at 4 benchmarks (GPQA, HumanEval, MMLU, MMLU-Pro).

Kimi K2 Instruct significantly outperforms across most benchmarks.

Fri May 08 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2 Instruct costs less

For input processing, Grok-2 ($2.00/1M tokens) is 4.0x more expensive than Kimi K2 Instruct ($0.50/1M tokens).

For output processing, Grok-2 ($10.00/1M tokens) is 20.0x more expensive than Kimi K2 Instruct ($0.50/1M tokens).

In conclusion, Grok-2 is more expensive than Kimi K2 Instruct.*

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

Lowest available price from all providers

Fri May 08 2026 • llm-stats.com

Grok-2

Input tokens$2.00

Output tokens$10.00

Best providerxAI

Kimi K2 Instruct

Input tokens$0.50

Output tokens$0.50

Best providerFireworks

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K2 Instruct accepts 200,000 input tokens compared to Grok-2's 128,000 tokens. Kimi K2 Instruct can generate longer responses up to 200,000 tokens, while Grok-2 is limited to 8,000 tokens.

Grok-2

Input128,000 tokens

Output8,000 tokens

Kimi K2 Instruct

Input200,000 tokens

Output200,000 tokens

Fri May 08 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok-2 supports multimodal inputs, whereas Kimi K2 Instruct does not.

Grok-2 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-2

Text

Images

Audio

Video

Kimi K2 Instruct

Text

Images

Audio

Video

License

Usage and distribution terms

Grok-2 is licensed under a proprietary license, while Kimi K2 Instruct uses MIT.

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

Grok-2

Proprietary

Closed source

Kimi K2 Instruct

MIT

Open weights

Release Timeline

When each model was launched

Grok-2 was released on 2024-08-13, while Kimi K2 Instruct was released on 2025-07-11.

Kimi K2 Instruct is 11 months newer than Grok-2.

Grok-2

Aug 13, 2024

1.7 years ago

Kimi K2 Instruct

Jul 11, 2025

10 months ago

11mo 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-2 is available from xAI. Kimi K2 Instruct is available from Fireworks, Novita.

Grok-2

xAI

Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M

Kimi K2 Instruct

Fireworks

Input Price:Input: $0.50/1MOutput Price:Output: $0.50/1M

Novita

Input Price:Input: $0.57/1MOutput Price:Output: $2.30/1M

* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Grok-2

View details

xAI

Supports multimodal inputs

Kimi K2 Instruct

View details

Moonshot AI

Larger context window (200,000 tokens)

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher GPQA score (75.1% vs 56.0%)

Higher HumanEval score (93.3% vs 88.4%)

Higher MMLU score (89.5% vs 87.5%)

Higher MMLU-Pro score (81.1% vs 75.5%)

Detailed Comparison

AI Model Comparison Table
Feature	Grok-2	Kimi K2 Instruct

FAQ

Common questions about Grok-2 vs Kimi K2 Instruct.

Which is better, Grok-2 or Kimi K2 Instruct?

Kimi K2 Instruct significantly outperforms across most benchmarks. Grok-2 is made by xAI and Kimi K2 Instruct is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-2 compare to Kimi K2 Instruct in benchmarks?

Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%. Kimi K2 Instruct scores MATH-500: 97.4%, GSM8k: 97.3%, CBNSL: 95.6%, HumanEval: 93.3%, MMLU-Redux: 92.7%.

Is Grok-2 cheaper than Kimi K2 Instruct?

Kimi K2 Instruct is 4.0x cheaper for input tokens. Grok-2 costs $2.00/M input and $10.00/M output via xai. Kimi K2 Instruct costs $0.50/M input and $0.50/M output via fireworks.

What are the context window sizes for Grok-2 and Kimi K2 Instruct?

Grok-2 supports 128K tokens and Kimi K2 Instruct supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-2 and Kimi K2 Instruct?

Key differences include context window (128K vs 200K), input pricing ($2.00 vs $0.50/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-2 and Kimi K2 Instruct?

Grok-2 is developed by xAI and Kimi K2 Instruct is developed by Moonshot AI.