Claude 3 Opus vs Grok 4.20 Beta

Compare Claude 3 Opus by Anthropic against Grok 4.20 Beta by xAI, context windows of 200K vs 2.0M, tested across 12 shared challenges. Updated March 2026.

Which is better, Claude 3 Opus or Grok 4.20 Beta?

Claude 3 Opus and Grok 4.20 Beta are both competitive models. Claude 3 Opus costs $15/M input tokens vs $2/M for Grok 4.20 Beta. Context windows: 200K vs 2000K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and Grok 4.20 Beta

Claude 3 Opus is made by anthropic while Grok 4.20 Beta is from xai. Claude 3 Opus has a 200K token context window compared to Grok 4.20 Beta's 2000K. On pricing, Claude 3 Opus costs $15/M input tokens vs $2/M for Grok 4.20 Beta.

Our Verdict
Grok 4.20 Beta
Grok 4.20 Beta
Claude 3 Opus
Claude 3 OpusRunner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — newer, bigger context window.

Grok 4.20 Beta is 13x cheaper per token — worth considering if cost matters.

Too close to call
FAQ

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