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Claude Opus 5 vs Grok 4.5

Grok 4.5 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

Grok 4.5

Faster

Tie

Detailed Comparison

CategoryClaude Opus 5Grok 4.5
ProviderAnthropic xAI
Context Window200K WIN128K
Input Price ($/1M)$15 $0.2 WIN
Output Price ($/1M)$75 $1 WIN
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 is cheaper, Claude Opus 5 or Grok 4.5?

Grok 4.5 is approximately 99% cheaper than Claude Opus 5 per million tokens.

Which has a larger context window?

Claude Opus 5 supports 200K context, while Grok 4.5 supports 128K.

Is Claude Opus 5 or Grok 4.5 open source?

Claude Opus 5 is proprietary. Grok 4.5 is proprietary.

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