Shipped: Allocate AI spend by the tags on your IAM roles
The tags you put on the IAM users and roles that call your models now come through as dimensions you can group and filter on. Tag a role with costCenter, department, email, or name, group by that key, and the model spend those callers drove shows up underneath. That gives you the human-readable half of caller identity. A caller ARN like assumed-role/inference-gateway/session-8842 names a role.