Claude Opus 4.5 vs DeepSeek R1

Compare Claude Opus 4.5 by Anthropic against DeepSeek R1 by DeepSeek, in 1 community votes, claude opus 4.5 and deepseek r1 are closely matched, tested across 42 shared challenges. Updated February 2026.

In 1 community votes, Claude Opus 4.5 and DeepSeek R1 are closely matched. Based on blind community voting from the RIVAL open dataset of 1+ human preference judgments for this pair.

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