Sesame

Market position

Sesame is positioned in the emerging market for emotionally expressive voice AI and AI wearables, competing with command-oriented assistants such as Amazon Alexa. Its combination of a speech model and in-house glasses hardware, plus a founding team drawn from Oculus and Meta, is presented in coverage as a differentiator. A third-party profile reported preparation for a $200 million Series B at a $1 billion valuation as of mid-2025; the round announced in October 2025 was $250 million.

Sources cite: direct speech generation that conveys rhythm and emotion rather than text-to-speech over LLM output; sub-300 ms conversational latency; vertical integration of the AI model with proprietary all-day smart glasses; open-source model releases alongside hosted APIs; positioning of the assistant as a companion rather than a transactional command tool; and a hardware-experienced founding team from Oculus, Fitbit and Meta.

Technology

Voice-first conversational AI. Sesame's research spans speech generation, personality modeling and multimodality, supported by large GPU clusters and in-house training and evaluation capability. An investor description cited by TechCrunch says the system generates speech directly rather than converting LLM text output to audio, capturing rhythm, emotion and expressiveness. A third-party profile describes the underlying Conversational Speech Model as transformer-based, processing text and audio simultaneously with sub-300 ms response times, with an open-source CSM-1B variant published on Hugging Face. The hardware effort centers on lightweight eyewear with high-quality audio and hands-free voice interaction.

Go-to-market

Sesame emerged from stealth in February 2025 with public web demos of its AI voices, which generated substantial early usage and media coverage. It subsequently gated access through a research preview and an invite-limited iOS beta opened to a select group of testers in October 2025, with testers asked to keep feedback confidential. Hardware distribution plans have not been disclosed beyond a stated 2027 timeframe for the eyewear on the company's website.

Consumers seeking an always-available personal voice agent for everyday, "in-between" moments. One aggregator profile additionally cites potential applications in customer service, healthcare, education and personal assistance, and a developer audience for its open-source model.

Geography

Headquartered in San Francisco, California, with additional offices in Bellevue and New York.

History

An aggregator profile lists a 2022 founding and early rounds including a $27M round announced in June 2022 and a $48M Series A announced in October 2023. Sesame emerged from stealth in February 2025 with the Maya and Miles voice demos, which more than a million people accessed within the first few weeks, generating over 5 million minutes of conversation. In October 2025 the company announced a $250 million Series B and opened an early beta of its iOS app.

Risks & controversies

The sources note that hardware timelines are uncertain — an investor acknowledged "hardware takes time" and no availability date for the glasses was shared in October 2025, while the company website later cites 2027. Funding figures differ across sources: a third-party aggregator lists a $48M Series A in October 2023 and a separate $27M round in June 2022 while also describing a $47.5M Series A and a planned $200M Series B at a $1B valuation, and that aggregator's source list includes unrelated companies with similar names, reducing its reliability. No litigation or regulatory issues involving this Sesame appear in the sources.