Smallest.ai Raises $21M Series A

Smallest.ai, a San Francisco-based foundational AI research lab, announced it has surpassed $21 million in total funding following the close of a $13 million Series A round led by Seligman Ventures, with participation from Sierra AI and 3one4 Capital. The company is building real-time voice AI infrastructure for enterprises and introduced Voice 4.0, a paradigm shift toward AI architectures that process listening, reasoning, action, and response in parallel. At the center of Voice 4.0 is Hydra, a speech-to-speech model designed around asynchronous intelligence, enabling real-time conversational flow, mid-conversation tool use, natural interruptions, and lower latency. Smallest.ai's platform includes Pulse STT Pro and Lightning V3.1, which rank among the top voice AI models on Artificial Analysis for speed, quality, and cost efficiency. Pulse STT Pro supports 38 languages and includes features such as speaker diarization, emotion detection, code-switching, noise reduction, and built-in PII and PCI redaction. Customers use Smallest.ai to automate enterprise voice workflows, reducing support costs by up to 80% while improving agent productivity by as much as 10x. The company works with organizations including RingCentral, Truecaller, Readymode, Piramal Group, Kogta, and Pocket. Smallest.ai has nearly 60 employees and plans significant expansion over the next year as demand for enterprise voice AI accelerates.