Model Comparison
Kimi K2.6 vs Grok 4.5Which is better in 2026?
Grok 4.5 significantly outperforms across most benchmarks. Kimi K2.6 is 2.1x cheaper per token.
Verdict: Kimi K2.6 vs Grok 4.5 — which is better?
Kimi K2.6 (by Moonshot AI) and Grok 4.5 (by xAI) 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.
Kimi K2.6 outperforms in 0 benchmarks, while Grok 4.5 is better at 3 benchmarks (GDPval-AA, GPQA, SWE-Bench Pro). Grok 4.5 significantly outperforms across most benchmarks.
On price, Kimi K2.6 is roughly 2.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4.5 also accepts a larger context window (500,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Kimi K2.6 if…
- cost matters — it's about 2.1x cheaper per token
- you need open weights you can self-host or fine-tune
Choose Grok 4.5 if…
- you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
- you process long inputs — it offers a 500,000 token context window
- you want the most recent training data — it shipped Jul 2026
Performance Benchmarks
Comparative analysis across standard metrics
Kimi K2.6 outperforms in 0 benchmarks, while Grok 4.5 is better at 3 benchmarks (GDPval-AA, GPQA, SWE-Bench Pro).
Grok 4.5 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Kimi K2.6 ($0.75/1M tokens) is 2.7x cheaper than Grok 4.5 ($2.00/1M tokens).
For output processing, Kimi K2.6 ($3.50/1M tokens) is 1.7x cheaper than Grok 4.5 ($6.00/1M tokens).
In conclusion, Grok 4.5 is more expensive than Kimi K2.6.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4.5 accepts 500,000 input tokens compared to Kimi K2.6's 262,144 tokens. Only Kimi K2.6 specifies output context (131,072 tokens).
Input Capabilities
Supported data types and modalities
Both Kimi K2.6 and Grok 4.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Kimi K2.6
Grok 4.5
License
Usage and distribution terms
Kimi K2.6 is licensed under Modified MIT License, while Grok 4.5 uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Modified MIT License
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Kimi K2.6 was released on 2026-04-20, while Grok 4.5 was released on 2026-07-08.
Grok 4.5 is 3 months newer than Kimi K2.6.
Apr 20, 2026
2 months ago
Jul 8, 2026
1 weeks ago
2mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Kimi K2.6 is available from DeepInfra, Fireworks, Moonshot AI, Novita, Together. Grok 4.5 is available from xAI.
Kimi K2.6
Grok 4.5
Outputs Comparison
Key Takeaways
Kimi K2.6
View detailsMoonshot AI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Kimi K2.6 and Grok 4.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Kimi K2.6 vs Grok 4.5.