Diagnosing the difference.
THE USUAL ANSWER
Prompting.
The same tool produces very different output depending on how it is asked.
WHAT PEOPLE WHO GET GOOD RESULTS DO
Supply context about their situation State who the output is for Specify length and format Give an example Iterate rather than accepting the first answer Supply their own facts and material
WHAT PEOPLE WHO GET POOR RESULTS DO
Ask a one-line question Expect it to know their business Accept the first output Ask for facts rather than for language
THE SINGLE BIGGEST DIFFERENCE
Context.
A request with three sentences of context produces output of a different order from one without.
WHAT ELSE MATTERS
The tier you are using. Free and paid models differ substantially in capability.
WHAT TO TRY
Take a request that disappointed you. Add who you are, who it is for, and what you want. Ask again.