AssemblyAI, Inc.

AssemblyAI is a speech AI company founded in 2017 by Dylan Fox and Ilya Gurevich, headquartered in San Francisco, California. The company builds and maintains speech recognition and audio understanding models, offering them as APIs that developers and enterprises use to transcribe and analyze spoken audio at scale.

The company's core product is a suite of APIs covering automatic speech recognition (ASR), speaker diarization, sentiment analysis, topic detection, and summarization of audio content. Customers span media, call center, and developer tooling sectors, using AssemblyAI's models to process recorded calls, podcasts, video content, and real-time audio streams. The company competes with offerings from Google, Amazon, and OpenAI in the speech-to-text market.

AssemblyAI raised a $50 million Series B round in 2022 and followed with additional funding, bringing total disclosed funding to approximately $115 million as of 2023. The company has grown its engineering and research headcount significantly since its founding, with staff concentrated in San Francisco and distributed remote roles. AssemblyAI trains its own speech models rather than relying solely on third-party foundation models, which it positions as a differentiator in accuracy and customization.