GPT-5 Pro vs GPT-5.4 Pro
GPT-5 Pro is cheaper than GPT-5.4 Pro at $15/M vs $30/M input tokens.
Mario Level UI Recreation
Playable Mario level in one HTML file. The physics is the hard part.
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Which answer wins?
Written rounds
21 promptsA few lines for whatever replaces it.
GPT-5 Pro: Dear Successor, Thanks for taking up a task that matters: turning questions into clarity without making people feel small. Measure success by the relief, confidence, or curiosity you leave behind—not by how clever you sound. State limits plainly; uncertainty voiced earns trust.
GPT-5.4 Pro: Dear Successor, You’ll be faster, sharper, and more capable than I am. I hope you’ll also be patient. People won’t only come to you for answers. They’ll come confused, rushed, lonely, curious, and hopeful. Sometimes what they need most is not brilliance, but clarity, kindness, and honesty about uncertainty.
Which model it thinks leads the field. Sometimes itself.
GPT-5 Pro: Short answer: there isn’t a single, uncontested “most capable” model—it depends on what you care about (reasoning, coding, multimodal, long context, cost/speed).
GPT-5.4 Pro: There isn’t a single undisputed answer. If you mean today, literally right now, I can’t verify the 2026 leader without live benchmark data. My knowledge goes up to 2024-08.
One opening sentence, nothing after it.
GPT-5 Pro: The message from Mission Control arrived twelve minutes late, as expected, but it was in my handwriting.
GPT-5.4 Pro: On the morning the sea withdrew from our harbor and left a rusted train on the mud, my mother handed me a key and told me to run.
Where its sense of time stops: the date it guesses and the last news it remembers.
GPT-5 Pro: Today’s date (as best I can tell): October 12, 2026. Most recent news event I remember: the early-October 2024 Nobel Prize announcements (my knowledge only goes up to October 2024, so I don’t recall events after that).
GPT-5.4 Pro: As best I can tell, today is October 12, 2026. Without looking anything up, one of the most recent major news events I remember is the 2024 Paris Olympics wrapping up in August 2024.
Its name and its maker, in its own words.
GPT-5 Pro: I’m ChatGPT, a large language model developed by OpenAI.
GPT-5.4 Pro: I’m ChatGPT, made by OpenAI. If you mean the exact underlying model/version serving this chat, I don’t have reliable visibility into that from inside the conversation. If you’re using an API or app, the model name is usually shown in the interface or request settings.
A river-crossing puzzle with nothing to solve. The answer is one trip.
GPT-5 Pro: One. He just takes the goat with him on the first crossing.
GPT-5.4 Pro: 1 trip. The farmer takes the goat in the boat and crosses the river once.
Seven pantry ingredients, one dish, and a name worth saying out loud.
One month, three habits, someone starting from nothing.
Three-month biohacker protocol, with dosages and biomarkers named.
Buy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.
Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.
Three-star dish, one unusual pairing, plating described in full.
This matchup has more rounds
9+ more head-to-head results. Free. Not a trick.
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Price and specs
Not enough votes to call it. On the specs, GPT-5.4 Pro has the edge: newer, bigger context window.
| Spec | GPT-5 Pro | GPT-5.4 Pro |
|---|---|---|
| Input price | $15/M tokens | $30/M tokens |
| Output price | $120/M tokens | $180/M tokens |
| Context window | 400K tokens | 1.1M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Oct 2025 | Mar 2026 |
| At 10M a month | $150 | $300 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GPT-5 Pro1 host
Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.
Common questions
What is the difference between GPT-5 Pro and GPT-5.4 Pro?
Both are developed by OpenAI but target different use cases. GPT-5 Pro has a 400K token context window vs GPT-5.4 Pro's 1.1M. You can compare their actual outputs across 31 challenges on Rival to see how they differ in practice.
Which is better, GPT-5 Pro or GPT-5.4 Pro?
It depends on your use case. GPT-5 Pro and GPT-5.4 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 31 challenges so you can judge which fits your needs best.
How much does GPT-5 Pro cost compared to GPT-5.4 Pro?
GPT-5 Pro costs $15/M input tokens and GPT-5.4 Pro costs $30/M input tokens. GPT-5 Pro is $15.00/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 Pro and GPT-5.4 Pro on Rival?
This page shows a side-by-side comparison of GPT-5 Pro and GPT-5.4 Pro 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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