Gemini 2.5 Flash Preview 05-20 (thinking) vs 
Llama 3.1 405B
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Llama 3.1 405B at $0.15/M vs $2.7/M input tokens.
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Price and specs
| Spec | Gemini 2.5 Flash Preview 05-20 (thinking) | Llama 3.1 405B |
|---|---|---|
| Input price | $0.15/M tokens | $2.7/M tokens |
| Output price | $3.5/M tokens | $3.1/M tokens |
| Context window | 1.0M tokens | 128K tokens |
| Parameters | Not disclosed | 405B |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Jul 2024 |
| At 10M a month | $1.50 | $27.00 |
Input tokens at list price. No caching, no batch discount.
Common questions
What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Llama 3.1 405B?
Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Llama 3.1 405B is developed by Meta AI. Gemini 2.5 Flash Preview 05-20 (thinking) 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.
Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or Llama 3.1 405B?
It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) 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.
How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to Llama 3.1 405B?
Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Llama 3.1 405B costs $2.7/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $2.55/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 Gemini 2.5 Flash Preview 05-20 (thinking) and Llama 3.1 405B on Rival?
This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) 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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