Quick answer
When evaluating a voice AI platform, the most critical metric for real‑time applications is turn latency. The 95th percentile (p95) captures the worst‑case experience most customers will notice, especially for sales and support calls that require rapid back‑and‑forth exchanges.
A bake‑off that truly reflects production performance begins with a common telephony source—Twilio, Telnyx, Plivo, or Vonage. By using the same carrier, you eliminate carrier‑induced variance and isolate the vendor’s stack from the PSTN path.
The benchmark test should consist of a scripted dialog that alternates between speech‑to‑text, LLM inference, and text‑to‑speech. Each turn’s latency is captured automatically in the vendor’s dashboard, then aggregated for the p95 calculation.
How Voxovo AI works on Voxovo
Voxovo AI’s latency scorecard reports every stage—STT, LLM, TTS, and overall turn time—in milliseconds. This transparency allows a side‑by‑side comparison with any managed stack that publishes comparable metrics.
Because latency is affected by network jitter, run the bake‑off from multiple geographic locations and repeat the same call set at least 30 times. The average of the p95 values gives a robust, reproducible benchmark.
A fair assessment also includes the presence buffer feature. Voxovo AI’s buffer pre‑loads filler audio so callers never hear dead air while the LLM or external tool processes the request, effectively reducing perceived latency even when backend latency spikes.
Live Sheet and Live Calendar integration provide a direct measure of mid‑call tool latency. In Voxovo AI, these tools execute within the same managed stack, keeping the turn latency within the vendor’s own latency envelope.
Implementation checklist
When comparing vendors, look at their native pipeline modes. Voxovo 1.0 Speed is engineered for the lowest turn latency, while Smart prioritizes accuracy and Ultra offers a Gemini Live speech‑to‑speech path. Each mode has distinct latency characteristics that should match your use case.
Competitive landscape: Vapi, Retell, and Bland AI are other options in the market. Vapi offers deep developer APIs and a robust assistant framework, Retell focuses on low‑latency telephony, and Bland AI specializes in outbound dialer scale and advanced AMD.
A practical checklist for your bake‑off: 1) Use the same carrier and phone number across vendors; 2) Run identical scripted dialogs from multiple regions; 3) Capture STT, LLM, and TTS timestamps; 4) Calculate p95 per turn; 5) Verify presence buffer activity; 6) Record tool execution latency in the live sheet/calendar.