I'd treat a claim as a way to correct and manage the listing, not as a ranking lever. Before changing anything, note the profile fields currently shown, then verify the real-world name, hours, phone, website and service area; track any referral visits separately in analytics. For a quick comparison, keep a small fixed set of customer-style prompts and recheck them after a few weeks, but don't treat a handful of chats as a ranking report because answers vary. On the data-source question, I wouldn't assume a particular API or provider unless OpenAI documents it; a claim screen alone doesn't reveal that pipeline. The practical win is accurate, maintainable business information, not guaranteed visibility.