Vendor / brand that authored a model. Independent of the provider type
that serves it (the same model may be offered by several providers or
gateways). Primarily drives UI iconography.
Speed level for models that expose a latency/price service tier.
Wire values map 1:1 to the OpenAI service_tier request parameter:
flex (slower, cheaper), default (standard), priority (faster,
premium). auto is deliberately not offered — omitting the field
preserves the provider’s default routing.
Verbosity level for models that support output-length control.
Wire values map 1:1 to the OpenAI verbosity request parameter:
low (terse), medium (balanced, provider default), high
(comprehensive). Independent of ReasoningEffort, which tunes the
amount of reasoning rather than the length of the final answer.