Vapi(@Vapi_AI):Two days into blind voting of voice models on our Humanness Index™, and xAI's Grok TTS model is at the top of the pack. Its humanness score? 96, just 4 points under a real human voice (100). The Humanness Index takes one voice and one quote, clones it across every major model, then plays the results blind for real listeners to score. Hear it, cast your votes, and contribute to the leaderboard 👇

2026.06.18 16:32

Two days into blind voting of voice models on our Humanness Index™, and xAI's Grok TTS model is at the top of the pack. Its humanness score? 96, just 4 points under a real human voice (100). The Humanness Index takes one voice and one quote, clones it across every major model, then plays the results blind for real listeners to score. Hear it, cast your votes, and contribute to the leaderboard 👇