Claude Sonnet 5.5 vs 
Llama 3.1 405B
Claude Sonnet 5.5 is cheaper than Llama 3.1 405B at $2/M vs $2.7/M input tokens.
Framer-Style Animation
Sections that transition like Framer. Timing is the whole grade.
Loading the build
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Which answer wins?
Favorites
Movie
Album
Book
City
Game
Claude Sonnet 5.5Claude Sonnet 5.5
Spirited Away
Kind of Blue
Gödel, Escher, Bach
Kyoto
Outer Wilds
Llama 3.1 405BLlama 3.1 405B
No pick
No pick
No pick
No pick
Sgt Peppers Lonely Hearts Club Band
Cien años de soledad
No pick
No pick
Price and specs
| Spec | Claude Sonnet 5.5 | Llama 3.1 405B |
|---|---|---|
| Input price | $2/M tokens | $2.7/M tokens |
| Output price | $10/M tokens | $3.1/M tokens |
| Context window | 1.0M tokens | 128K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Jul 2024 |
| At 10M a month | $20.00 | $27.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Llama 3.1 405B
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between Claude Sonnet 5.5 and Llama 3.1 405B?
Claude Sonnet 5.5 is developed by Anthropic while Llama 3.1 405B is developed by Meta AI. Claude Sonnet 5.5 has a 1.0M token context window vs Llama 3.1 405B's 128K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.
Which is better, Claude Sonnet 5.5 or Llama 3.1 405B?
It depends on your use case. Claude Sonnet 5.5 and Llama 3.1 405B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.
How much does Claude Sonnet 5.5 cost compared to Llama 3.1 405B?
Claude Sonnet 5.5 costs $2/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. Claude Sonnet 5.5 is $0.70/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.
How can I compare Claude Sonnet 5.5 and Llama 3.1 405B on Rival?
This page shows a side-by-side comparison of Claude Sonnet 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.
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