Short version: when you want a quick comparison from an AI, tell it to list the options first, keep each explanation to one sentence, and push the caveats to the end. You get a scannable answer instead of a wall of text.
The Idea
A Reddit user on r/PromptEngineering shared a small tip. For a short comparison, ask the model to give you three options first. Each one gets a single sentence of explanation. Anything cautionary, like exceptions, trade-offs, or “it depends” notes, comes after the list.
The post is short and only has one upvote so far, so treat it as a handy habit rather than a tested method. It’s still a good habit, and it costs you nothing to try. You don’t need a special tool, a plugin, or a long system prompt. You only need to add one sentence to the question you were already going to ask.
Here is what a typical exchange looks like without the rule. You ask which note-taking app to use. The model opens with a paragraph about how the best choice depends on your workflow, adds a second paragraph about syncing and privacy, and finally names three apps somewhere in the middle of paragraph three. With the rule, you see three app names and three short descriptions in the first few lines. The warnings about syncing and privacy still show up, but they sit at the bottom where you can read them or skip them.
Why the Order Matters
By default, many AI answers open with context. They explain the background, add a few warnings, and only then get to the options. You read three paragraphs before you know what you’re choosing between.
Flipping the order fixes that. You see the full set of choices up front, so you can judge them side by side. Your eyes can jump from option one to option two to option three without hunting through qualifiers. The caveats then land when you already have the picture, which is when they make the most sense. A warning about export limits means little before you know which tools are even on the table. After the list, it becomes a useful filter.
The one-sentence limit does a lot of work too. It stops each option from turning into a mini essay, and it forces the model to say what actually separates one choice from another. If two options sound almost identical in a single sentence each, that is a useful signal on its own. It tells you the real difference is small, and you can pick based on price or personal taste instead.
There is also a practical benefit when you read on a phone. Short lines with the choices stacked at the top fit on one screen. You can make a quick call, then scroll down only if you want the fine print.
A few small tweaks make the pattern more flexible:
- Change the number. Three is a good default, but two works for a head-to-head and five works for a wide brainstorm.
- Name the criteria. Add “compare them on cost and setup time” so each sentence covers the same ground.
- Cap the caveats. Say “no more than three caveats” so the ending stays as tight as the list.
Use Cases
- Comparing tools, such as three project management apps for a small team. Ask for the options first, then let the caveats mention things like seat limits or missing integrations.
- Picking between approaches, such as three ways to structure a newsletter intro. One line each is enough to see whether you want a story opening, a question, or a bold claim.
- Quick decisions, such as which of three pricing models fits a first product. The caveats at the end can flag things like how each model behaves with a tiny audience.
- Brainstorming, where you want a list to react to before going deeper. You can pick the most interesting idea and ask for a longer breakdown of only that one.
- Research triage, such as sorting three possible sources or reading approaches before you commit an afternoon to one of them.
Prompt of the Day
List three options first. Keep each explanation to one sentence. Then put any caveats after the list.
Add your topic at the start, for example: “I need to choose a way to collect email signups. List three options first…” If one option catches your eye, ask a follow-up about just that one and let the model go deeper there. You can also say “now expand option two with steps and pitfalls” so the detail arrives only where you asked for it.
If the answer still comes back long, add “no intro, no summary” to the end of the prompt. Some models like to wrap up with a closing paragraph, and that line trims it.
Call to Action
Try this on your next comparison question and see how it changes the answer. Run the same question both ways, with and without the rule, and notice how long it takes you to understand each response. If the structure works for you, save it as a reusable snippet in your notes app or text expander so you don’t have to retype it. Small formatting rules like this one tend to pay off the most because you use them every day.
Put the options before the explanation
by u/Educational-View8524 in PromptEngineering