consider these alternatives that might be more cost-effective:

Pre-populated Lookup Table: Create a table with common public email domains. Join your subscriptions_table with this lookup table to classify domains. This avoids AI calls altogether.

Rule-Based Classification: Develop a set of rules based on domain patterns (e.g., contains "gmail", ends with ".edu"). You can implement this using SQL within BigQuery.

Hybrid Approach: Use generative AI for a smaller subset of ambiguous domains that cannot be easily classified with rules or a lookup table.

General Best Practices

Start Small: Begin with a small sample of data to test your prompts and estimate costs. Monitor Usage: Track your token consumption closely using BigQuery's monitoring tools. Explore Alternatives: Always consider if simpler, non-AI solutions can achieve similar results. Stay Updated: Keep an eye on BigQuery's documentation for any pricing changes or new features that can help you optimize costs.