ChatGPT-4o (March 2025) vs Claude Opus 4

Compare ChatGPT-4o (March 2025) by OpenAI against Claude Opus 4 by Anthropic, in 6 community votes, claude opus 4 wins 75% of head-to-head duels, context windows of 128K vs 200K, tested across 20 shared challenges. Updated February 2026.

In 6 community votes, Claude Opus 4 wins 75% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 6+ human preference judgments for this pair.

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