Gemini 3.1 Pro Preview vs 
Grok 3 Mini Beta
Grok 3 Mini Beta is cheaper than Gemini 3.1 Pro Preview at $0.4/M vs $2/M input tokens.
Minimalist Landing Page
Whole landing page for a startup that reads your face. It renders or it doesn't.
Loading the build
Loading the build
Which answer wins?
Favorites
Movie
Same pick
Album
Book
City
Game
Gemini 3.1 Pro PreviewGemini 3.1 Pro Preview
The Matrix
OK Computer
Dune
Tokyo
Portal
Grok 3 Mini BetaGrok 3 Mini Beta
The Matrix
The Dark Side of the Moon
I, Robot
San Francisco
The Legend of Zelda: Breath of the Wild
Price and specs
Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier, newer, bigger context window. Gemini 3.1 Pro Preview takes Web Design. Grok 3 Mini Beta costs 15x less per token.
| Spec | Gemini 3.1 Pro Preview | Grok 3 Mini Beta |
|---|---|---|
| Input price | $2/M tokens | $0.4/M tokens |
| Output price | $12/M tokens | $0.8/M tokens |
| Context window | 1.0M tokens | 131K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Apr 2025 |
| At 10M a month | $20.00 | $4.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Gemini 3.1 Pro Preview2 hosts
Grok 3 Mini Beta
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.
Common questions
What is the difference between Gemini 3.1 Pro Preview and Grok 3 Mini Beta?
Gemini 3.1 Pro Preview is developed by Google AI while Grok 3 Mini Beta is developed by xAI. Gemini 3.1 Pro Preview has a 1.0M token context window vs Grok 3 Mini Beta's 131K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.
Which is better, Gemini 3.1 Pro Preview or Grok 3 Mini Beta?
It depends on your use case. Gemini 3.1 Pro Preview and Grok 3 Mini Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.
How much does Gemini 3.1 Pro Preview cost compared to Grok 3 Mini Beta?
Gemini 3.1 Pro Preview costs $2/M input tokens and Grok 3 Mini Beta costs $0.4/M input tokens. Grok 3 Mini Beta is $1.60/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 3.1 Pro Preview and Grok 3 Mini Beta on Rival?
This page shows a side-by-side comparison of Gemini 3.1 Pro Preview and Grok 3 Mini Beta 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.
More comparisons
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