Claude 2 vs Claude Opus 4

Compare Claude 2 and Claude Opus 4, both from Anthropic, in 2 community votes, claude opus 4 wins 100% of head-to-head duels, context windows of 100K vs 200K, tested across 4 shared challenges. Updated February 2026.

In 2 community votes, Claude Opus 4 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.

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