AI platforms don't have a single business database. They assemble information from multiple sources — web scraping, licensed data partnerships, public directories, and user-submitted corrections — and reconcile them into a composite picture. When the sources agree, the AI is confident. When they conflict, the AI either picks the most recent source, hedges its answer, or skips the business entirely.
ChatGPT primarily draws on training data with a cutoff date. For local businesses, this means the information could be 12–18 months out of date. Phone numbers change. Businesses move. Hours shift. The AI doesn't know.
Gemini has an advantage through its integration with Google Business Profile data, which is more current. But GBP data is still user-submitted and unverified at the source level. A business that hasn't updated their GBP in two years is presenting the same stale data to Gemini as to ChatGPT.
Perplexity uses live web search to assemble answers, which means more current data — but also more noise. It cannot determine which source is authoritative. Your website, a scraper directory from 2022, and a competitor's mention of you carry roughly equal weight unless you provide a verified anchor point.