Claude Opus 5.5vsLlama 3.1 405B

Claude Opus 5.5 is developed by Anthropic while Llama 3.1 405B is developed by Meta AI. Claude Opus 5.5 has a 1.0M token context window vs Llama 3.1 405B's 128K. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude Opus 5.5 and Llama 3.1 405B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 5 challenges so you can judge which fits your needs best.

Claude Opus 5.5 costs $4/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. Llama 3.1 405B is $1.30/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude Opus 5.5 and Llama 3.1 405B across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.