Negative Prompting: Getting Better Results by Saying What You Don't Want
ALG Team
Everything AI and More · Aug 9, 2026 · 3 min read
Most prompting advice focuses on describing the output you want. But sometimes the fastest fix for a bad response is telling the model exactly what to stop doing — a technique that's easy to overlook but often solves a stubborn problem in one line.
- Naming an unwanted behavior directly often fixes it faster than restating what you want.
- Be as specific about what to exclude as you would be about what to include.
- Pair a negative instruction with a positive alternative for the clearest result.
When positive instructions aren't enough
If a model keeps sneaking in a habit you don't want — hedging every sentence, adding a closing summary you didn't ask for, using a phrase you're tired of — describing the ideal output again often doesn't fix it. Naming the specific unwanted behavior directly usually does.
Be specific about what to exclude
"Don't be repetitive" is too vague to act on. "Don't repeat the question back before answering it" or "don't use the phrase 'in today's fast-paced world'" gives the model something concrete to avoid, the same way a good positive instruction needs to be concrete.
Combine it with a positive instruction
Negative prompting works best paired with a positive one: "don't include a summary at the end — instead, end right after your last point." Telling the model what to do instead of the unwanted behavior gives it a clear alternative rather than just a rule to avoid.
Frequently Asked Questions
What is negative prompting?
Explicitly telling a model what to avoid — a specific phrase, habit, or format — rather than only describing the output you want.
When is negative prompting most useful?
When a model keeps repeating a specific unwanted behavior across responses that a positive instruction alone hasn't fixed.