GPT-5 Codex vs Claude Opus 4

Compare GPT-5 Codex by OpenAI against Claude Opus 4 by Anthropic, in 4 community votes, gpt-5 codex and claude opus 4 are closely matched, tested across 31 shared challenges. Updated February 2026.

In 4 community votes, GPT-5 Codex and Claude Opus 4 are closely matched. Claude Opus 4 leads in Web Design. Based on blind community voting from the RIVAL open dataset of 4+ human preference judgments for this pair.

Web Design: Claude Opus 4 wins 67% of votes
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