List LLM providers the organization can select in the settings UI.
Always includes the platform_default row first, followed by
concrete LLM providers known to the catalog with a connected
flag reflecting whether the organization already owns a matching
model resource.
Returns: Ordered list of provider summary rows for the settings picker.
Successful Response
Classification of a catalog model's capability tier.
Tier labels a model in the LLM catalog so the API can pick an appropriate concrete model for a requested PerformanceProfile. Tier and PerformanceProfile share the same string values but are semantically distinct: tier describes the model, profile describes the user's selection.
fast, balanced, reasoning