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Smallest.ai Raises $13M Series A to Build Two-Model Voice Agent Architecture

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Smallest.ai has closed a $13 million Series A round, bringing its total funding to $21 million since its late-2024 launch. The startup is deploying the capital behind a new architecture called Hydra, which splits a voice agent's processing between a small, real-time speech model and a larger foundational model for complex queries. The small model handles live conversation with near-zero latency, while the larger model is called upon only when deeper reasoning is needed — mirroring how a human support agent might briefly place a caller on hold to research an issue. CEO Sudarshan Kamath argues this two-model split is the future of all AI voice agents, targeting enterprise contact centers that prioritize instant response over premium audio quality. The announcement comes amid a broader wave of voice AI investment, with Fish Audio and Gradium also raising significant rounds in the same week, signaling growing market interest in low-latency voice infrastructure.

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