Claude Sonnet 4.5 vs DeepSeek V3.1

Compare Claude Sonnet 4.5 by Anthropic against DeepSeek V3.1 by DeepSeek, in 1 community votes, deepseek v3.1 wins 100% of head-to-head duels, context windows of 200K vs 164K, tested across 43 shared challenges. Updated February 2026.

In 1 community votes, DeepSeek V3.1 wins 100% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 1+ human preference judgments for this pair.

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