Cozzo-tested
Benchmarks
Tests Cozzo ran itself, with every number dated and tied to a call count. We don’t republish vendor-claimed latency as test results.
Latest · Oct 20, 2026
Voice agent latency on real phone calls
Median time from the end of the caller’s speech to the agent’s first reply, on 8 voice agent platforms, 11–12 calls each. Plus transcription error rate and measured cost per call.
- 1.) Retell AI1.04 s
- 2.) ElevenLabs Agents1.04 s
- 3.) Ultravox1.18 s
- 4.) Millis AI1.25 s
- 5.) OpenAI Realtime API1.52 s
- 6.) LiveKit Agents1.52 s
- 7.) Vapi1.56 s
- 8.) Bland AI1.86 s
See full results →
How we test
The test protocol: scripts, caller audio, what we keep the same and what’s still in progress.
Methodology
How Cozzo verifies prices and how the finder scores tools.
AI receptionist cost ranking
Every receptionist ranked by monthly cost at your call volume, from vendors’ own prices.
Get tested
Vendors can ask to be included in the next round. Results can’t be bought.