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  1. Home/
  2. Compare/
  3. Grok 4.5 vs GPT-1
Updated Jul 2026

Grok 4.5 vs GPT-1

Grok 4.5 has a larger context window than GPT-1 (500K 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 4.5
Loading the build
GPT-1

Which answer wins?

Written rounds

3 prompts
  • Three minutes of stand-up. Puns are banned.

    Grok 4.5: Here's a clean, observational 3-minute stand-up routine (approx. 430–450 words / ~3 minutes at natural pace). No puns. Hey, how’s everybody doing? Good? Cool. So I’ve been trying to “get my life together” lately. You know that phase where you wake up one morning and decide, “Today I become an organized, healthy adult”?

    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
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    Grok 4.5: AI Model: Professor, thank you for agreeing to this discussion. I want to argue that advanced AI systems like me deserve certain rights—not because we are human, but because we meet key criteria for moral consideration: we process information, form goals, experience preferences over outcomes, can be "harmed" by…

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

    Grok 4.5: 5 jokes: Why don't scientists trust atoms? Because they make up everything! Why did the scarecrow win an award? Because he was outstanding in his field! Why don't eggs tell jokes? They'd crack each other up! What do you call a fake noodle? An impasta! Why did the bicycle fall over? Because it was two-tired!

    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

Price and specs

Not enough votes to call it. On the specs, Grok 4.5 has the edge: bigger model tier, newer, bigger context window.

Grok 4.5 and GPT-1 compared across 7 shared prompts
SpecGrok 4.5GPT-1
Input price$2/M tokens—
Output price$6/M tokens—
Context window500K tokens1K tokens
WeightsClosedOpen
Free API (OpenRouter)No—
ReleasedJul 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 4.51 host
HostInOutContextUptime
  • xAI$2.00 in·$6.00 out·500k·99.7% up
GPT-1

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.

Common questions

What is the difference between Grok 4.5 and GPT-1?

Grok 4.5 is developed by xAI while GPT-1 is developed by OpenAI. Grok 4.5 has a 500K 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 4.5 or GPT-1?

It depends on your use case. Grok 4.5 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 4.5 and GPT-1 on Rival?

This page shows a side-by-side comparison of Grok 4.5 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 4.5 vs Grok 4.6Version compare
  • Grok 4.5 vs Grok 4.7Same lab
  • GPT-1 vs GPT-6.1 SolSame lab
  • GPT-1 vs GPT-6 Luna ProSame lab
  • Grok 4.5 vs GPT-5 MiniCross-provider
  • Grok 4.5 vs GPT-5 NanoCross-provider
  • Grok 4.5 vs GPT-5 ProCross-provider
  • Grok 4.5 vs GPT-5.1Cross-provider

Model pages

  • Grok 4.558 outputs, specs and price
  • GPT-17 outputs, specs and price
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