For customer support in your business, it's essential to strike a balance between response quality and cost efficiency. I would recommend using the Curie 001 AI model. This model is a cost-effective choice that still delivers a high level of capability, making it suitable for handling customer support queries.

Curie 001 is fast and provides a good balance between performance and cost. It should be able to handle most customer support tasks, including answering frequently asked questions, providing assistance with common issues, and offering guidance on using your products or services.

However, if your customer support requires more complex problem-solving, deeper understanding, or a higher level of accuracy, you might consider using one of the Davinci models (002 or 003) for better performance, but at a higher cost.