Claude Opus 4.6 vs GPT-5.1 Codex Max

Compare Claude Opus 4.6 by Anthropic against GPT-5.1 Codex Max by OpenAI, in 4 community votes, claude opus 4.6 wins 100% of head-to-head duels, tested across 52 shared challenges. Updated February 2026.

In 4 community votes, Claude Opus 4.6 wins 100% of head-to-head duels. Claude Opus 4.6 leads in Image Generation. Based on blind community voting from the RIVAL open dataset of 4+ human preference judgments for this pair.