Behind the Features: Your Top Questions from the Vapi Webinar, Answered

Vapi introduced three product releases aimed at helping builders select voice-agent models, test agents before deployment, and run outbound calling at scale. Model Intelligence provides presets and performance data for transcribers, LLMs, and voices, including cost, latency, transcription word error rate, and a proprietary voice Humanness Index, with metrics based on live-call performance. Simulations lets teams create customizable AI callers and test scenarios that generate pass/fail outcomes, transcripts, and recordings; it supports dashboard and API workflows, configurable LLM judges, and repeated test runs to account for non-deterministic results, while Vapi still recommends manual testing. Rebuilt Campaigns can call lists of up to 10,000 contacts with personalized calls, eligibility checks, scheduled dialing windows, and adjustable concurrency, though automatic concurrency management is planned rather than currently available. Vapi advises lower outbound concurrency to avoid poor answer-rate periods and recommends a fixed opening message to reduce first-turn latency.

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