Build the route
Voice uses GPT-Realtime-2.1 Mini, one response per turn. Typed tasks reserve at most $0.08704; recordings reserve at most $1.29024. These are conservative spending holds, not actual charges. Provider usage determines the final cost. Interrupted turns retain their hold until reconciled.
Provider credentials stay inside the Provider Broker. Generated files are encrypted before storage. A cost is marked exact only when a provider supplies authoritative billing evidence.