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Claude Sonnet 4.5 vs Grok 4.20 Beta

Compare Claude Sonnet 4.5 by Anthropic against Grok 4.20 Beta by xAI, context windows of 200K vs 2.0M, tested across 42 shared challenges. Updated March 2026.

Which is better, Claude Sonnet 4.5 or Grok 4.20 Beta?

Claude Sonnet 4.5 and Grok 4.20 Beta are both competitive models. Claude Sonnet 4.5 costs $3/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 Sonnet 4.5 and Grok 4.20 Beta

Claude Sonnet 4.5 is made by anthropic while Grok 4.20 Beta is from xai. Claude Sonnet 4.5 has a 200K token context window compared to Grok 4.20 Beta's 2000K. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $2/M for Grok 4.20 Beta.

Our Verdict
Grok 4.20 Beta
Grok 4.20 Beta
Claude Sonnet 4.5
Claude Sonnet 4.5Runner-up

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

Slight edge
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