Sesame

What it does

Sesame's Conversational Speech Model (CSM) creates AI voices that go beyond text-to-speech, aiming for truly natural and engaging conversations.

Voice is our most intimate medium as humans. At Sesame, we are creating conversational partners that achieve voice presence—the quality that makes spoken interactions feel real, understood, and valued.

How do we know when someone truly understands us? It is rarely just our words—it is in the subtleties of voice: the rising excitement, the thoughtful pause, the warm reassurance. Voice is our most intimate medium as humans, carrying layers of meaning through countless variations in tone, pitch, rhythm, and emotion. Today’s digital voice assistants lack essential qualities to make them truly useful. Without unlocking the full power of voice, they cannot hope to effectively collaborate with us. A personal assistant who speaks only in a neutral tone has difficulty finding a permanent place in our daily lives after the initial novelty wears off. Over time this emotional flatness becomes more…from sesame.com

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