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Grok 4.5 vs Kimi K3

Grok 4.5 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

Grok 4.5

Faster

Tie

Detailed Comparison

CategoryGrok 4.5Kimi K3
ProviderxAI Moonshot AI
Context Window128K 128K
Input Price ($/1M)$0.2 WIN$0.6
Output Price ($/1M)$1 WIN$2.5
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo Yes

Frequently Asked Questions

Which is cheaper, Grok 4.5 or Kimi K3?

Grok 4.5 is approximately 61% cheaper than Kimi K3 per million tokens.

Which has a larger context window?

Grok 4.5 supports 128K context, while Kimi K3 supports 128K.

Is Grok 4.5 or Kimi K3 open source?

Grok 4.5 is proprietary. Kimi K3 is open source.

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