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Grok 4.6 vs Kimi K2 Instruct

Comparing Grok 4.6 and Kimi K2 Instruct across benchmarks, pricing, and capabilities.

xAI · Moonshot AI · Updated for 2026

Which is better?

Grok 4.6 and Kimi K2 Instruct trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Kimi K2 Instruct is roughly 6.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok 4.6 also accepts a larger context window (500,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Grok 4.6

  • you process long inputs — it offers a 500,000 token context window
  • you want the most recent training data — it shipped Aug 2026

Choose Kimi K2 Instruct

  • cost matters — it's about 6.0x cheaper per token
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok 4.6
xAI
Kimi K2 Instruct
Moonshot AI
Benchmark wins
—
—
Input price
$2.00 / M
$0.50 / M
Output price
$6.00 / M
$0.50 / M
Context window
500,000
200,000
Released
Aug 2026
Jul 2025
License
Proprietary
MIT

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok 4.6 and Kimi K2 Instructdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

Kimi K2 Instruct costs less

For input processing, Grok 4.6 ($2.00/1M tokens) is 4.0x more expensive than Kimi K2 Instruct ($0.50/1M tokens).

For output processing, Grok 4.6 ($6.00/1M tokens) is 12.0x more expensive than Kimi K2 Instruct ($0.50/1M tokens).

In conclusion, Grok 4.6 is more expensive than Kimi K2 Instruct.*

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

Lowest available price from all providers
Mon Aug 24 2026 • llm-stats.com
xAI
Grok 4.6
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Moonshot AI
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

Grok 4.6 accepts 500,000 input tokens compared to Kimi K2 Instruct's 200,000 tokens. Only Kimi K2 Instruct specifies output context (200,000 tokens).

xAI
Grok 4.6
Input500,000 tokens
Output- tokens
Moonshot AI
Kimi K2 Instruct
Input200,000 tokens
Output200,000 tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4.6 supports multimodal inputs, whereas Kimi K2 Instruct does not.

Grok 4.6 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok 4.6

Text
Images
Audio
Video

Kimi K2 Instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4.6 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 4.6

Proprietary

Closed source

Kimi K2 Instruct

MIT

Open weights

Release Timeline

When each model was launched

Grok 4.6 was released on 2026-08-12, while Kimi K2 Instruct was released on 2025-07-11.

Grok 4.6 is 13 months newer than Kimi K2 Instruct.

Grok 4.6

Aug 12, 2026

1 weeks ago

1.1yr newer
Kimi K2 Instruct

Jul 11, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Grok 4.6 has a documented knowledge cutoff of 2026-02-01, while Kimi K2 Instruct's cutoff date is not specified.

We can confirm Grok 4.6's training data extends to 2026-02-01, but cannot make a direct comparison without Kimi K2 Instruct's cutoff date.

Grok 4.6

Feb 2026

Kimi K2 Instruct

—

Provider Availability

Grok 4.6 is available from xAI. Kimi K2 Instruct is available from Fireworks, Novita.

Grok 4.6

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M

Kimi K2 Instruct

fireworks logo
Fireworks
Input Price:Input: $0.50/1MOutput Price:Output: $0.50/1M
novita logo
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→

Judge for yourself.

Run your own prompts against Grok 4.6 and Kimi K2 Instruct side-by-side, then vote on the output you prefer.

Grok 4.6
✓ Preferred
Kimi K2 Instruct
Open in Playground

FAQ

Common questions about Grok 4.6 vs Kimi K2 Instruct.

Which is better, Grok 4.6 or Kimi K2 Instruct?

Grok 4.6 (xAI) and Kimi K2 Instruct (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 4.6 compare to Kimi K2 Instruct in benchmarks?

Grok 4.6 scores CursorBench v3.2: 69.9%, DeepSWE 1.1: 65.9%, FrontierCode: 61.3%, AA-Index: 61.0%, GDPval-AA: 58.4%. Kimi K2 Instruct scores MATH-500: 97.4%, GSM8k: 97.3%, CBNSL: 95.6%, HumanEval: 93.3%, MMLU-Redux: 92.7%.

Is Grok 4.6 cheaper than Kimi K2 Instruct?

Kimi K2 Instruct is 4.0x cheaper for input tokens. Grok 4.6 costs $2.00/M input and $6.00/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 4.6 and Kimi K2 Instruct?

Grok 4.6 supports 500K 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 4.6 and Kimi K2 Instruct?

Key differences include context window (500K 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 4.6 and Kimi K2 Instruct?

Grok 4.6 is developed by xAI and Kimi K2 Instruct is developed by Moonshot AI.

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