For an AI product, model, assistant or developer tool, a short .ai can be a very strong name. In that situation the extension is doing part of the branding for you, and the higher yearly cost may be easy to justify.
I would be much more cautious if AI is only a small feature of the business. Paying a premium every renewal for an extension that does not add anything to the brand is hard to justify, especially if a clean .com is available for much less.
What I would check before buying
- Is AI central enough to the brand that .ai adds real meaning?
- Is the domain standard-priced or premium-priced?
- What is the full two-year renewal cost?
- Would the matching .com or another extension work just as well?
If cost is the deciding factor, take the .ai quote you are considering and compare it with current .com pricing. The difference is easier to judge when you look at the full registration and renewal cost rather than the headline offer.