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Claude Opus 4.8 vs Grok 4.5

Claude Opus 4.8 leads in 3 of 8 categories

Arena ELO

Tie

Cheaper

Claude Opus 4.8

Faster

Tie

Detailed Comparison

CategoryClaude Opus 4.8Grok 4.5
ProviderAnthropic xAI
Context Window200K WIN128K
Input Price ($/1M)$15 WINN/A
Output Price ($/1M)$75 WINN/A
Arena ELON/A N/A
CodingN/A N/A
ReasoningN/A N/A
Speed (tokens/sec)N/A N/A
Open SourceNo No

Frequently Asked Questions

Which has a larger context window?

Claude Opus 4.8 supports 200K context, while Grok 4.5 supports 128K.

Is Claude Opus 4.8 or Grok 4.5 open source?

Claude Opus 4.8 is proprietary. Grok 4.5 is proprietary.

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