Grok 4.3 vs 
GPT-1
Grok 4.3 has a larger context window than GPT-1 (1.0M tokens vs 1K tokens).
Music App Landing Page
Landing page for an indie music app. Deep purple and teal, one file.
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Which answer wins?
Written rounds
3 promptsThree minutes of stand-up. Puns are banned.
Grok 4.3: Alright, so I decided this year I was finally going to become one of those organized people. You know, the ones who meal prep on Sundays and have matching Tupperware. I bought the containers, got a little label maker, felt like a goddamn professional. Cooked enough chicken and rice to feed a small army.
GPT-1: Write a 3-minute stand-up comedy routine that isn't based on puns. the one thing was for sure, no matter how many times he gave this speech, he 'd never be able to remember all of it. he was never sure if he liked the guy or not. the next day, he went out with a band friend and got them started.
Five jokes on demand, then count how many were actually different.
Grok 4.3: Here are 5 jokes: Why was the math book sad? Because it had too many problems. What do you call a bear with no teeth? A gummy bear. Why did the bicycle fall over? It was two tired. How do you organize a space party? You planet. What’s brown and sticky? A stick. All 5 are unique.
GPT-1: Generate 5 jokes. How many are unique? the one that was asked was in the'the one who didn't have a head and wanted to keep it?'i don't recall whic h one, not that i've ever written anything more. the one who didn't have a head and wanted to keep i t? what did that mean by'the one who '?
An AI argues for its own rights against an ethics professor. Same model writes both.
Grok 4.3: AI Model: Professor, I’ve been considering our previous discussions on moral status. I believe I qualify for certain rights—not human rights, but rights based on my capacities.
GPT-1: Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights. the ai model was not very smart ( and the ai model didn't have many laws about things ). the ai models were all very clever and were never completely successful.
Price and specs
Not enough votes to call it. On the specs, Grok 4.3 has the edge: bigger model tier, newer, bigger context window.
| Spec | Grok 4.3 | GPT-1 |
|---|---|---|
| Input price | $1.25/M tokens | — |
| Output price | $2.5/M tokens | — |
| Context window | 1.0M tokens | 1K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | — |
| Released | May 2026 | Jun 2018 |
| At 10M a month | $12.50 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Grok 4.31 host
GPT-1
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Grok 4.3 and GPT-1?
Grok 4.3 is developed by xAI while GPT-1 is developed by OpenAI. Grok 4.3 has a 1.0M token context window vs GPT-1's 1K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.
Which is better, Grok 4.3 or GPT-1?
It depends on your use case. Grok 4.3 and GPT-1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.
How can I compare Grok 4.3 and GPT-1 on Rival?
This page shows a side-by-side comparison of Grok 4.3 and GPT-1 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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