Do we need to re-index when we switch models?

Re-indexing on provider change is the hidden switching cost that makes model independence theoretical for many platforms. If the index is a provider artefact, changing provider means rebuilding it, and the rebuild grows more expensive as the corpus does.

The Vector Index in Centralpoint is built and held in the organization's own environment, and model selection happens at runtime. Changing provider does not require re-indexing or restructuring the pipeline, which means the decision can be made on cost, capability or policy grounds rather than being deferred because the migration is daunting.