GPT-4.5 vs Claude Opus 4

Compare GPT-4.5 by OpenAI against Claude Opus 4 by Anthropic, in 90 community votes, claude opus 4 wins 85% of head-to-head duels, context windows of 128K vs 200K, tested across 17 shared challenges. Updated February 2026.

In 90 community votes, Claude Opus 4 wins 85% of head-to-head duels. Claude Opus 4 leads in Web Design, Image Generation, Conversation. Based on blind community voting from the RIVAL open dataset of 90+ human preference judgments for this pair.