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Ultra-low-latency speech synthesis API for building real-time voice AI applications and conversational agents.
Lmnt (pronounced "element") is a San Francisco-based speech synthesis company that provides an ultra-low-latency text-to-speech API designed specifically for real-time voice AI applications including conversational AI agents, voice interfaces, and interactive voice response systems. While traditional TTS APIs have latency measured in hundreds of milliseconds, Lmnt's streaming architecture delivers the first audio bytes in under 100 milliseconds, enabling natural back-and-forth voice conversations without perceivable delay. The company offers voice cloning from short samples and a library of pre-built voices with emotional range, all accessible through a developer-friendly API. Lmnt is used by companies building AI companions, customer service voice bots, and voice-enabled productivity tools that require speech synthesis fast enough to feel natural. Founded in 2021 by ex-Google Brain researchers, Lmnt raised seed funding to commercialize research on real-time speech synthesis. It competes with ElevenLabs Turbo, Cartesia, and Deepgram TTS in the low-latency speech API market.
Adept AI raised $415M to pioneer computer-use AI agents; its core research and agent team moved to Amazon in 2024 in a landmark talent acquisition while the company continues developing ACT-1 for enterprise automation.
Adept AI was founded in 2022 by a team of former OpenAI, DeepMind, and Google Brain researchers to build AI that can take actions on computers — navigating software interfaces, filling forms, and executing multi-step workflows in any application. Its ACT-1 model demonstrated the ability to control web browsers and desktop applications through natural language instructions, pioneering the computer-use agent paradigm that Anthropic later commercialized with Claude's computer use feature.
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