Claude Sonnet 4.5 vs Claude Opus 4.6

Compare Claude Sonnet 4.5 and Claude Opus 4.6, both from Anthropic, in 31 community votes, claude opus 4.6 wins 76% of head-to-head duels, context windows of 200K vs 1.0M, tested across 42 shared challenges. Updated February 2026.

In 31 community votes, Claude Opus 4.6 wins 76% of head-to-head duels. Claude Opus 4.6 leads in Web Design, Image Generation. Based on blind community voting from the RIVAL open dataset of 31+ human preference judgments for this pair.