GPT-5.3-Codex vs 
Grok 3 Mini Beta
Grok 3 Mini Beta is cheaper than GPT-5.3-Codex at $0.4/M vs $1.75/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
Album
Book
City
Game
GPT-5.3-CodexGPT-5.3-Codex
Spirited Away
Kind of Blue
The Dispossessed
Kyoto
Outer Wilds
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, GPT-5.3-Codex has the edge: bigger model tier, newer, bigger context window. Grok 3 Mini Beta costs 18x less per token.
| Spec | GPT-5.3-Codex | Grok 3 Mini Beta |
|---|---|---|
| Input price | $1.75/M tokens | $0.4/M tokens |
| Output price | $14/M tokens | $0.8/M tokens |
| Context window | 400K tokens | 131K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Apr 2025 |
| At 10M a month | $17.50 | $4.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GPT-5.3-Codex2 hosts
Grok 3 Mini Beta
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between GPT-5.3-Codex and Grok 3 Mini Beta?
GPT-5.3-Codex is developed by OpenAI while Grok 3 Mini Beta is developed by xAI. GPT-5.3-Codex has a 400K 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, GPT-5.3-Codex or Grok 3 Mini Beta?
It depends on your use case. GPT-5.3-Codex 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 GPT-5.3-Codex cost compared to Grok 3 Mini Beta?
GPT-5.3-Codex costs $1.75/M input tokens and Grok 3 Mini Beta costs $0.4/M input tokens. Grok 3 Mini Beta is $1.35/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 GPT-5.3-Codex and Grok 3 Mini Beta on Rival?
This page shows a side-by-side comparison of GPT-5.3-Codex 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.
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