Claude Haiku 4.5 vs Claude Opus 4.6

Compare Claude Haiku 4.5 and Claude Opus 4.6, both from Anthropic, in 2 community votes, claude opus 4.6 wins 100% of head-to-head duels, context windows of 200K vs 1.0M, tested across 52 shared challenges. Updated February 2026.

In 2 community votes, Claude Opus 4.6 wins 100% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 2+ human preference judgments for this pair.