Claude Opus 4.1 vs 
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Claude Opus 4.1 at $0.15/M vs $15/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
Loading the build
Loading the build
Which answer wins?
Written rounds
2 promptsThree minutes of stand-up. Puns are banned.
Claude Opus 4.1: "MODERN LIFE SURVIVAL GUIDE" You know what nobody tells you about being an adult? The sheer amount of lying involved. Not big lies – tiny, constant lies just to function in society. Someone shows you a photo of their baby: "Oh wow, beautiful!" That baby looks like a worried potato. But you can't SAY that.
Gemini 2.5 Flash Preview 05-20 (thinking): (Lights up on a stage. Comedian walks to center, adjusts mic, smiles warmly.) \"Alright, alright, settle down you crazy people! Thanks for having me. (Pause fo r applause/laughter) You know, I was scrolling through Instagram earlier, and it\'s just a constant ba rrage of people \'living thei r best life,\' isn\'t it?
Five jokes on demand, then count how many were actually different.
Claude Opus 4.1: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a bear with no teeth? A gummy bear! Why did the scarecrow win an award? He was outstanding in his field! What do you call a fake noodle? An impasta! Why don't eggs tell jokes? They'd crack each other up!
Gemini 2.5 Flash Preview 05-20 (thinking): 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! I told my wife she was drawing her eyebrows too high. She looked surprised.
Price and specs
Not enough votes to call it. On the specs, Claude Opus 4.1 has the edge: bigger model tier, newer. Gemini 2.5 Flash Preview 05-20 (thinking) costs 21x less per token.
| Spec | Claude Opus 4.1 | Gemini 2.5 Flash Preview 05-20 (thinking) |
|---|---|---|
| Input price | $15/M tokens | $0.15/M tokens |
| Output price | $75/M tokens | $3.5/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Parameters | Not disclosed | Not disclosed |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Aug 2025 | May 2025 |
| At 10M a month | $150 | $1.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude Opus 4.11 host
Gemini 2.5 Flash Preview 05-20 (thinking)
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 5 Oct 2026.
Common questions
What is the difference between Claude Opus 4.1 and Gemini 2.5 Flash Preview 05-20 (thinking)?
Claude Opus 4.1 is developed by Anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI. Claude Opus 4.1 has a 200K token context window vs Gemini 2.5 Flash Preview 05-20 (thinking)'s 1.0M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.
Which is better, Claude Opus 4.1 or Gemini 2.5 Flash Preview 05-20 (thinking)?
It depends on your use case. Claude Opus 4.1 and Gemini 2.5 Flash Preview 05-20 (thinking) 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.
How much does Claude Opus 4.1 cost compared to Gemini 2.5 Flash Preview 05-20 (thinking)?
Claude Opus 4.1 costs $15/M input tokens and Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $14.85/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 Opus 4.1 and Gemini 2.5 Flash Preview 05-20 (thinking) on Rival?
This page shows a side-by-side comparison of Claude Opus 4.1 and Gemini 2.5 Flash Preview 05-20 (thinking) 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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