Claude Sonnet 4 vs Grok Code Fast 1
Compare Claude Sonnet 4 by Anthropic against Grok Code Fast 1 by xAI, in 203 community votes, claude sonnet 4 wins 68% of head-to-head duels, context windows of 200K vs 256K, tested across 54 shared challenges. Updated May 2026.
Which is better, Claude Sonnet 4 or Grok Code Fast 1?
Claude Sonnet 4 is the better choice overall, winning 68% of 203 blind community votes on Rival. Claude Sonnet 4 costs $3/M input tokens vs $0.2/M for Grok Code Fast 1. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4 and Grok Code Fast 1
Claude Sonnet 4 is made by anthropic while Grok Code Fast 1 is from xai. Claude Sonnet 4 has a 200K token context window compared to Grok Code Fast 1's 256K. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $0.2/M for Grok Code Fast 1. In community voting, In 203 community votes, Claude Sonnet 4 wins 68% of head-to-head duels.
In 203 community votes, Claude Sonnet 4 wins 68% of head-to-head duels. Claude Sonnet 4 leads in Web Design, Image Generation, Conversation, while Grok Code Fast 1 leads in Reasoning, Analysis. Based on blind community voting from the Rival open dataset of 203+ human preference judgments for this pair.
Per 1M tokens
Grok Code Fast 1 is cheaper on both — 15× input, 10× output
Pick Claude Sonnet 4. In 203 blind votes, Claude Sonnet 4 wins 68% of the time. That's not luck.
Pick Claude Sonnet 4 for Image Generation, Conversation, Web Design. Pick Grok Code Fast 1 for Reasoning, Analysis. Grok Code Fast 1 is 10x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Sonnet 4 uses 14.7x more emoji
