Gemini 2.5 Flash Preview 05-20 is cheaper than Gemini 3.1 Pro Preview at $0.15/M vs $2/M input tokens.
Pokémon battle screen you can actually click. One HTML file.
Which answer wins?
Three minutes of stand-up. Puns are banned.
Gemini 2.5 Flash Preview 05-20: Alright, alright, settle down you magnificent collection of human beings! You look good tonight. Not just good, but… like you've all collectively decided to nail the 'I'm here to laugh and avoid talking about my Monday' look. And I respect that. Seriously though, it's great to be back on stage. I'm living the dream.
Gemini 3.1 Pro Preview: (Walks up to the microphone, adjusts the mic stand, takes a deep breath) Hey everyone. I realized recently that I am my own worst enemy. Specifically, when I go to the grocery store. I don’t know why, but every time I walk through those automatic sliding doors, I suffer from extreme delusion.
Five jokes on demand, then count how many were actually different.
Gemini 2.5 Flash Preview 05-20: Here are 5 jokes for you: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised.
Gemini 3.1 Pro Preview: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta! Why did the scarecrow win an award? Because he was outstanding in his field! How does a penguin build its house? Igloos it together! Why don't skeletons fight each other?
Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier, newer. Gemini 3.1 Pro Preview wins Web Design and Image Generation. Gemini 2.5 Flash Preview 05-20 costs 20x less per token.
| Spec | ||
|---|---|---|
| Input price | $0.15/M tokens | $2/M tokens |
| Output price | $0.6/M tokens | $12/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Feb 2026 |
| At 10M a month | $1.50 | $20.00 |
Input tokens at list price. No caching, no batch discount.
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.
Both are developed by Google AI but target different use cases. Gemini 2.5 Flash Preview 05-20 has a 1.0M token context window vs Gemini 3.1 Pro Preview's 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.
It depends on your use case. Gemini 2.5 Flash Preview 05-20 and Gemini 3.1 Pro Preview each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.
Gemini 2.5 Flash Preview 05-20 costs $0.15/M input tokens and Gemini 3.1 Pro Preview costs $2/M input tokens. Gemini 2.5 Flash Preview 05-20 is $1.85/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 Gemini 2.5 Flash Preview 05-20 and Gemini 3.1 Pro Preview 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.