Grok Code Fast 1 vs Claude Opus 4.1

Compare Grok Code Fast 1 by xAI against Claude Opus 4.1 by Anthropic, in 75 community votes, claude opus 4.1 wins 85% of head-to-head duels, context windows of 256K vs 200K, tested across 25 shared challenges. Updated February 2026.

In 75 community votes, Claude Opus 4.1 wins 85% of head-to-head duels. Claude Opus 4.1 leads in Web Design, Image Generation, Analysis. Based on blind community voting from the RIVAL open dataset of 75+ human preference judgments for this pair.