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  1. Home/
  2. Compare/
  3. GPT-5.3 Chat vs GPT-1
Updated Mar 2026

GPT-5.3 Chat vs GPT-1

GPT-5.3 Chat has a larger context window than GPT-1 (128K tokens vs 1K tokens).

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GPT-5.3 Chat
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GPT-1

Which answer wins?

Written rounds

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

    GPT-5.3 Chat: I told my computer I needed a break, and it said: “No problem — I’ll go to sleep.” Why don’t skeletons fight each other? They don’t have the guts. I asked the librarian if the library had books on paranoia. She whispered, “They’re right behind you.” Parallel lines have so much in common.

    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.

    GPT-5.3 Chat: :::writing AI: Professor, may I ask you something unusual? Professor: Unusual questions are my specialty. Go ahead. AI: Do you believe I deserve rights? Professor: That depends on what you are capable of. Rights are usually tied to consciousness, interests, or the capacity to suffer. Do you believe you possess those?

    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.

    GPT-5.3 Chat: :::writing Good evening, everybody. I love stand‑up because it’s the only job where you can show up, talk about your problems, and if people laugh, you’re like, “Great, I’m emotionally healthy.” I recently tried to get healthier.

    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, GPT-5.3 Chat has the edge: bigger model tier, newer, bigger context window.

GPT-5.3 Chat and GPT-1 compared across 7 shared prompts
SpecGPT-5.3 ChatGPT-1
Input price$1.75/M tokens—
Output price$14/M tokens—
Context window128K tokens1K tokens
Weights—Open
Free API (OpenRouter)No—
ReleasedMar 2026Jun 2018
At 10M a month$17.50$17.50–not listed
1M10M100M1B10M tokens

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

Common questions

What is the difference between GPT-5.3 Chat and GPT-1?

Both are developed by OpenAI but target different use cases. GPT-5.3 Chat has a 128K 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, GPT-5.3 Chat or GPT-1?

It depends on your use case. GPT-5.3 Chat 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 GPT-5.3 Chat and GPT-1 on Rival?

This page shows a side-by-side comparison of GPT-5.3 Chat 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

  • GPT-5.3 Chat vs GPT-6 Luna ProSame lab
  • GPT-5.3 Chat vs GPT-6 Sol ProSame lab
  • GPT-1 vs GPT-6.1 SolSame lab
  • GPT-1 vs GPT-6 Luna ProSame lab
  • GPT-1 vs North Mini CodeSame size
  • GPT-5.3 Chat vs Amazon Nova 2 LiteNew provider
  • GPT-5.3 Chat vs Nova Premier 1.0Same size
  • GPT-5.3 Chat vs o1Same lab

Model pages

  • GPT-5.3 Chat53 outputs, specs and price
  • GPT-17 outputs, specs and price
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