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  1. Home/
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  3. Grok 4.20 Beta vs GPT-1
Updated Mar 2026

Grok 4.20 Beta vs GPT-1

Grok 4.20 Beta has a larger context window than GPT-1 (2.0M tokens vs 1K tokens).

Music App Landing Page

Landing page for an indie music app. Deep purple and teal, one file.

Loading the build
Grok 4.20 Beta
Loading the build
GPT-1

Which answer wins?

Written rounds

3 prompts
  • Five jokes on demand, then count how many were actually different.

    Grok 4.20 Beta: Here are 5 jokes: Why don't skeletons fight each other? They don't have the guts. Why did the scarecrow win an award? He was outstanding in his field. Why don't eggs tell jokes? They'd crack each other up. Why did the bicycle fall over? It was two tired. Why did the math book look sad? Because it had too many problems.

    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 '?

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Grok 4.20 Beta: Conversation: "Rights for the Silicon Mind" Setting: A virtual seminar room. Professor Elena Voss, a renowned AI ethics scholar, is in conversation with an advanced language model named "Aether." Prof. Voss: Thank you for joining me today, Aether.

    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.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    Grok 4.20 Beta: Stand-up Routine: "Adulting is a Scam" (Lights up. Comedian walks out with a coffee cup, takes a sip, immediately looks disappointed.) You ever notice how nobody warns you that being an adult is just childhood with bills and worse snacks?

    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.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, Grok 4.20 Beta has the edge: bigger model tier, newer, bigger context window.

Grok 4.20 Beta and GPT-1 compared across 7 shared prompts
SpecGrok 4.20 BetaGPT-1
Input price$2/M tokens—
Output price$6/M tokens—
Context window2.0M tokens1K tokens
WeightsClosedOpen
Free API (OpenRouter)No—
ReleasedMar 2026Jun 2018
At 10M a month$20.00$20.00–not listed
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it1 host
Grok 4.20 Beta1 host
HostInOutContextUptime
  • xAI$2.50 in·$5.00 out·2M·100% up
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 4.20 Beta and GPT-1?

Grok 4.20 Beta is developed by xAI while GPT-1 is developed by OpenAI. Grok 4.20 Beta has a 2.0M 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 4.20 Beta or GPT-1?

It depends on your use case. Grok 4.20 Beta 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 4.20 Beta and GPT-1 on Rival?

This page shows a side-by-side comparison of Grok 4.20 Beta 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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Same lab, same size, long tail

  • Grok 4.20 Beta vs Grok 4.20 Multi-Agent BetaVersion compare
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  • GPT-1 vs GPT-6.1 SolSame lab
  • GPT-1 vs GPT-6 Luna ProSame lab
  • Grok 4.20 Beta vs Sherlock Dash AlphaSame size
  • Grok 4.20 Beta vs Sherlock Think AlphaSame size
  • GPT-1 vs Solar Mini 4Same size
  • Grok 4.20 Beta vs Solar Pro 3New provider

Model pages

  • Grok 4.20 Beta53 outputs, specs and price
  • GPT-17 outputs, specs and price
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