Claude Opus 4.1 vs Llama 3.1 405B

Compare Claude Opus 4.1 by Anthropic against Llama 3.1 405B by Meta AI, in 1 community votes, claude opus 4.1 wins 100% of head-to-head duels, context windows of 200K vs 128K, tested across 2 shared challenges. Updated February 2026.

In 1 community votes, Claude Opus 4.1 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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