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Claude Opus 4.5 vs Grok 3 Mini Beta

Compare Claude Opus 4.5 by Anthropic against Grok 3 Mini Beta by xAI, tested across 13 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.5 or Grok 3 Mini Beta?

Claude Opus 4.5 and Grok 3 Mini Beta are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and Grok 3 Mini Beta

Claude Opus 4.5 is made by anthropic while Grok 3 Mini Beta is from xai.

Our Verdict
Claude Opus 4.5
Claude Opus 4.5
Grok 3 Mini Beta
Grok 3 Mini BetaRunner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer.

Too close to call
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Claude Opus 4.5Grok 3 Mini Beta

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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