Prompt Engineering

Short vs Detailed Prompts: Which Wins?

Long prompts feel safer but often score worse. A worked comparison of a tight 25-word prompt against a 90-word ramble that controls less.

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Overview

The instinct says a longer prompt gives the model more to work with. Often the opposite is true: a short prompt that nails audience, format, and length out-controls a long one padded with hedges and restated wishes. The loaded pair makes the point — Prompt A is five lines and wins; Prompt B is a paragraph of 'thorough, comprehensive, but also brief' that contradicts itself. The interesting question isn't short versus long; it's words that control output versus words that don't.

How to use this resource

Compare the loaded pair

Run the comparison with Token Efficiency focus. The short prompt wins despite being a quarter of the length.
Read why B loses

B's gaps: a brevity-vs-exhaustive contradiction, hedges ('try to', 'if possible' style wording), and zero format control beyond adjectives.
Try your own pair

Paste your long prompt as B and write a 3-5 line version as A that keeps only the controlling instructions. Compare.
Keep whichever controls more

If the long version genuinely wins on completeness, keep it — the point is measuring, not always choosing short.

Why This Works

Efficiency scoring counts control per word, so padding actively costs points instead of looking thorough
The contradiction detector catches the classic long-prompt failure: demanding exhaustive detail and brevity at once
Seeing a 25-word prompt outscore a 90-word one recalibrates the instinct that length equals safety

Best for

Prompts that grew over time and now feel heavy
High-volume workflows where token count is real money
Anyone who suspects their long prompt works despite its length, not because of it

Not for

Tasks that genuinely need long context — context is input, not instruction bloat
Comparing two long prompts — this resource is specifically about the length trade-off

Use cases

Settling the 'should I write more?' question for a prompt you reuse daily
Trimming a bloated prompt and verifying the short version didn't lose control
Demonstrating to a team why hedge words and restated wishes cost quality

FAQ

Why does the short 25-word prompt beat the 90-word one in this comparison?

Prompt A's three lines each control output: '5 bullet points for executives' sets format, 'Lead with revenue impact' sets order, and 'Flag any number that changed more than 10% quarter over quarter' sets a concrete rule. Prompt B spends 90 words on adjectives like 'thorough' and 'engaging' that steer nothing. Efficiency scoring counts control per word, so B's padding loses points.

Does prompt-comparator actually declare which prompt is the winner?

The comparator surfaces an efficiency score and flags issues like Prompt B's brevity-vs-exhaustive contradiction, but it diagnoses rather than certifies a winner. Even the workflow says to keep the long version if it 'genuinely wins on completeness' for your task. You read the scores and the flagged contradiction, then decide; NewPrompt doesn't run your summary or guarantee the higher score is right for your job.

How do I compare my own long prompt instead of the built-in Prompt B?

Paste your long prompt into the B slot where the 'thorough, comprehensive... while also keeping it brief' ramble sits, then write a 3-5 line Prompt A that keeps only your controlling instructions, the way A uses '5 bullet points for executives' and 'Lead with revenue impact'. Run it on Token Efficiency. Keep whichever controls more; measuring is the point, not always choosing short.

Customize This Resource

Opens both prompts in Prompt Comparator. Compare them to see scores, strengths, and which one is stronger.

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Prompt A

Copy it as-is, or use Open in Prompt Comparator to load it pre-filled and customize it with your own context.

Summarize this report in 5 bullet points for executives.
Lead with revenue impact.
Flag any number that changed more than 10% quarter over quarter.

Prompt B

I would like you to please carefully read the entire report and then try to produce a thorough, comprehensive, and highly detailed summary covering every section, every figure, and all the nuances, while also keeping it brief and easy to scan, and please make sure it is high quality and useful and engaging for everyone who might read it across the company.

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