I would not use ChatGPT for market research and paste the output into a pitch deck. It will sound smooth. Smooth is dangerous when the stat never existed.
Safe uses
Brainstorm customer segments.
Draft interview questions.
Summarize notes you paste in.
Compare framing of a problem.
List hypotheses to test, not facts to trust.
Unsafe uses
Market size without sources.
Competitor revenue guesses.
Regulatory claims.
"Customers definitely want" statements with no interviews.
Pair with real work
Talk to ten buyers.
Read filings, reviews, forums, job posts.
Search for pricing pages and churn signals.
The best use of ChatGPT in research is thinking faster before you talk to humans, then throwing away anything that did not survive contact with reality.