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Claude Opus 4.8 vs Kimi K2

Kimi K2 leads in 4 of 8 categories

Arena ELO

Kimi K2

Cheaper

Kimi K2

Faster

Kimi K2

Detailed Comparison

CategoryClaude Opus 4.8Kimi K2
ProviderAnthropic Moonshot
Context Window200K WIN128K
Input Price ($/1M)$5 $0.55 WIN
Output Price ($/1M)$25 $2.2 WIN
Arena ELON/A 1380 WIN
CodingN/A 65.8% SWE-bench
ReasoningN/A 60.2% BrowseComp
Speed (tokens/sec)N/A ~50 t/s WIN
Open SourceNo Yes

Frequently Asked Questions

Which is cheaper, Claude Opus 4.8 or Kimi K2?

Kimi K2 is approximately 91% cheaper than Claude Opus 4.8 per million tokens.

Which is better for coding, Claude Opus 4.8 or Kimi K2?

Claude Opus 4.8 scores N/A on coding benchmarks, while Kimi K2 scores 65.8% SWE-bench.

Which has a larger context window?

Claude Opus 4.8 supports 200K context, while Kimi K2 supports 128K.

Is Claude Opus 4.8 or Kimi K2 open source?

Claude Opus 4.8 is proprietary. Kimi K2 is open source.

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