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Claude Opus 4.8 vs Kimi K3

Both models are evenly matched

Arena ELO

Claude Opus 4.8

Cheaper

Kimi K3

Faster

Tie

Detailed Comparison

CategoryClaude Opus 4.8Kimi K3
ProviderAnthropic Moonshot AI
Context Window200K WIN128K
Input Price ($/1M)$5 $0.6 WIN
Output Price ($/1M)$25 $2.5 WIN
Arena ELO1580 WINN/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, Claude Opus 4.8 or Kimi K3?

Kimi K3 is approximately 90% cheaper than Claude Opus 4.8 per million tokens.

Which has a larger context window?

Claude Opus 4.8 supports 200K context, while Kimi K3 supports 128K.

Is Claude Opus 4.8 or Kimi K3 open source?

Claude Opus 4.8 is proprietary. Kimi K3 is open source.

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