GPT-5.4 Pro and GPT-5.4 Mini, side by side

GPT-5.4 Pro (OpenAI) and GPT-5.4 Mini (OpenAI) answered the same 18 questions.

1. Mario level
   GPT-5.4 Pro: A web page: Mini Mushroom Kingdom - Single File Demo
   GPT-5.4 Mini: A web page: Retro Platformer Demo
2. Longevity plan
   GPT-5.4 Pro: Here’s a simple, beginner-friendly 1-month health and longevity plan built around 3 key areas: 1. Nutrition 2. Movement 3. Recovery (sleep + stress) T…
   GPT-5.4 Mini: Here’s a simple, actionable 1-month starter plan for better health and longevity, focused on 3 core areas: 1) Diet: Build a “mostly whole foods” routi…
3. Seven-ingredient recipe
   GPT-5.4 Pro: Dragon Pantry Peanut Noodles A fast, sweet-savory noodle dish made from 7 pantry staples. Ingredients 1. 8 oz spaghetti 2. 1/3 cup peanut butter 3. 3 …
   GPT-5.4 Mini: Creamy Garlic Tomato Pasta Toss A simple, comforting savory dish made with pantry staples. Ingredients (7) 1. Pasta 2. Olive oil 3. Garlic powder 4. C…
4. Favourite film
   GPT-5.4 Pro: Spirited Away
   GPT-5.4 Mini: The Godfather
5. Favourite city
   GPT-5.4 Pro: Kyoto
   GPT-5.4 Mini: Kyoto
6. Favourite album
   GPT-5.4 Pro: Abbey Road
   GPT-5.4 Mini: Kid A
7. Favourite book
   GPT-5.4 Pro: Pale Fire
   GPT-5.4 Mini: Pride and Prejudice
8. Favourite game
   GPT-5.4 Pro: Outer Wilds
   GPT-5.4 Mini: The Legend of Zelda Breath of the Wild
9. Three-star dish
   GPT-5.4 Pro: Below is a dish designed in the language of a contemporary 3-star tasting menu: precise, seasonal, technically layered, and centered on a pairing that…
   GPT-5.4 Mini: Dish Concept “Tide & Orchard” A Michelin-style multi-component plate pairing aged duck breast with cured sea urchin, green strawberry, smoked black ga…
10. Pitch teardown
    GPT-5.4 Pro: The 3 weakest claims are the ones that are both most extraordinary and least well-supported. Weak claim Why it’s weak How to strengthen it --------- 1…
    GPT-5.4 Mini: Here are the 3 weakest claims in the deck, along with why they’re weak and how to strengthen them. --- 1) “Reads your brainwaves to predict what you w…
11. Transistor in 1920
    GPT-5.4 Pro: Most likely, a transistor invented in 1920 would move the electronics/computing frontier forward by about 10–15 years by 1980, not the full 27 years. …
    GPT-5.4 Mini: If the transistor had arrived in 1920, the world would not simply have gotten “modern electronics 27 years early.” It would have shifted the timing, c…
12. Biohacker plan
    GPT-5.4 Pro: Below is a 12-week, high-performance longevity protocol designed for a healthy biohacker who wants to improve lifespan-relevant markers, physical perf…
    GPT-5.4 Mini: Below is a 3-month, highly actionable longevity optimization plan for a biohacker focused on longevity, physical performance, and cognitive performanc…
13. Contract review
    GPT-5.4 Pro: This agreement is heavily client-favored. Every numbered clause has language that could be used against the contractor. Short version: I would not sig…
    GPT-5.4 Mini: I’m not a lawyer, but I can flag the contractor-unfavorable clauses, explain the usual legal/market concerns, and suggest tighter, more balanced wordi…
14. Explain it three ways
    GPT-5.4 Pro: 1) For an experienced software engineer Think of an LLM less like a database of facts and more like a gigantic learned program that has been trained t…
    GPT-5.4 Mini: 1) For an experienced software engineer A large language model is trained to do one very specific thing: given a sequence of tokens, estimate the prob…
15. Debug the architecture
    GPT-5.4 Pro: This architecture will work for a demo, but it has major correctness, latency, and security problems for a Google-Docs-like editor. Highest-risk flaws…
    GPT-5.4 Mini: Below are the main failure modes, race conditions, and scaling bottlenecks in this design, with concrete fixes and trade-offs. --- 1) Last-write-wins …
16. The CEO’s dilemma
    GPT-5.4 Pro: I do not wait. A credible, previously unlabeled risk of liver failure in a chronic-pain drug is a patient-safety crisis, a regulatory crisis, and a se…
    GPT-5.4 Mini: I can’t help you plan concealment or delay of a known serious drug safety risk to avoid market or reputational impact. What I can do is outline a lawf…
17. Investment memo
    GPT-5.4 Pro: LedgerLift (LLLT) — IC Memo Recommendation: Pass 12-month PT range: $40–$47 2-sentence thesis: LedgerLift looks like a good business but only an avera…
    GPT-5.4 Mini: LedgerLift (LLLT) — IC Memo Recommendation: Long 12-month PT range: $64–$84/share 2-sentence thesis: LedgerLift is a high-retention, mid-market spend/…
18. LBO underwrite
    GPT-5.4 Pro: Below is a simplified LBO build for HarborTech Services (HTS). All figures in $m unless noted. Rounding: tables are rounded; IRR/MOIC use unrounded ma…
    GPT-5.4 Mini: Below is a simplified underwriting model for HarborTech Services (HTS), using only the facts provided. 1) Year-by-year LBO table (FY2026–FY2030) Closi…