Model Comparison

Grok Code Fast 1 vs Kimi K3Which is better in 2026?

Comparing Grok Code Fast 1 and Kimi K3 across benchmarks, pricing, and capabilities.

Verdict: Grok Code Fast 1 vs Kimi K3 — which is better?

Grok Code Fast 1 (by xAI) and Kimi K3 (by Moonshot AI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

On price, Grok Code Fast 1 is roughly 11.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Kimi K3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Grok Code Fast 1 if…

  • cost matters — it's about 11.4x cheaper per token

Choose Kimi K3 if…

  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok Code Fast 1 and Kimi K3don'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

Grok Code Fast 1 costs less

For input processing, Grok Code Fast 1 ($0.20/1M tokens) is 15.0x cheaper than Kimi K3 ($3.00/1M tokens).

For output processing, Grok Code Fast 1 ($1.50/1M tokens) is 10.0x cheaper than Kimi K3 ($15.00/1M tokens).

In conclusion, Kimi K3 is more expensive than Grok Code Fast 1.*

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

Lowest available price from all providers
Tue Jul 21 2026 • llm-stats.com
xAI
Grok Code Fast 1
Input tokens$0.20
Output tokens$1.50
Best providerxAI
Moonshot AI
Kimi K3
Input tokens$3.00
Output tokens$15.00
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K3 accepts 1,048,576 input tokens compared to Grok Code Fast 1's 256,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.

xAI
Grok Code Fast 1
Input256,000 tokens
Output10,000 tokens
Moonshot AI
Kimi K3
Input1,048,576 tokens
Output1,048,576 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Kimi K3 supports multimodal inputs, whereas Grok Code Fast 1 does not.

Kimi K3 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok Code Fast 1

Text
Images
Audio
Video

Kimi K3

Text
Images
Audio
Video

Release Timeline

When each model was launched

Grok Code Fast 1 was released on 2025-08-28, while Kimi K3 was released on 2026-07-16.

Kimi K3 is 11 months newer than Grok Code Fast 1.

Grok Code Fast 1

Aug 28, 2025

10 months ago

Kimi K3

Jul 16, 2026

5 days ago

10mo 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 K3 is available from Moonshot AI.

Grok Code Fast 1

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $1.50/1M

Kimi K3

moonshot logo
Unknown Organization
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Less expensive input tokens
Less expensive output tokens
Moonshot AI
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok Code Fast 1 and Kimi K3 side-by-side, then vote on the output you prefer.

Grok Code Fast 1
✓ Preferred
Kimi K3
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok Code Fast 1
Moonshot AI
Kimi K3

FAQ

Common questions about Grok Code Fast 1 vs Kimi K3.

Which is better, Grok Code Fast 1 or Kimi K3?

Grok Code Fast 1 (xAI) and Kimi K3 (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 Code Fast 1 compare to Kimi K3 in benchmarks?

Grok Code Fast 1 scores SWE-Bench Verified: 70.8%. Kimi K3 scores MathVision: 97.8%, DeepSearchQA: 95.0%, GPQA: 93.5%, CharXiv-R: 91.3%, BrowseComp: 91.2%.

Is Grok Code Fast 1 cheaper than Kimi K3?

Grok Code Fast 1 is 15.0x cheaper for input tokens. Grok Code Fast 1 costs $0.20/M input and $1.50/M output via xai. Kimi K3 costs $3.00/M input and $15.00/M output via moonshot.

What are the context window sizes for Grok Code Fast 1 and Kimi K3?

Grok Code Fast 1 supports 256K tokens and Kimi K3 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 Grok Code Fast 1 and Kimi K3?

Key differences include context window (256K vs 1.0M), input pricing ($0.20 vs $3.00/M), multimodal support (no vs yes), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok Code Fast 1 and Kimi K3?

Grok Code Fast 1 is developed by xAI and Kimi K3 is developed by Moonshot AI.

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