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Which AI voices sound most human
Ranked by blind A/B votes with a Bradley-Terry model, measured against a real human baseline.
Read the methodology & get the full 2026 reportHumanness rescales the blind win-rate vs a real human: 50% (indistinguishable) = 100, so 95 ≈ picked 47% of the time. Latency is warm first-audio at the Speko gateway (n=30); price is the provider's published rate. Each row is one fixed male+female voice pair. Vote counts are live rounds; the fit also carries a disclosed Vapi-index prior. Dimmed rows: too few live rounds yet. Open data: JSON · CSV (CC BY 4.0).
The tradeoff
Naturalness vs. speed
The most human voice isn't always the one you can ship in a live call. The closer to the dashed human line and the further right, the better the deal.
Every voice here runs on Speko
Speko is the voice-AI gateway — one API for ElevenLabs, OpenAI, Cartesia and every provider above, auto-picked by benchmark for latency, cost and naturalness.
Help decide the ranking
Every blind vote sharpens these numbers.