A — 0: There is only a demo or an undocumented current model. B — 1: The current configuration is recorded, but obvious prompt/schema/retrieval fixes are untested. C — 2: The current and improved practical baseline have been tested with versions, settings and results saved.
Evidence to attach: model/endpoint, prompt, corpus version, date and measured outcomes. If weak: spend a bounded period improving the comparator; do not let the supplier choose a deliberately weak baseline.