Vapi voice agent with AssemblyAI Universal-3.5 Pro Realtime

Vapi is a managed voice platform that simplifies the creation of voice agents by handling telephony, turn-taking, and orchestration, while supporting over 14 speech-to-text providers. The guide focuses on using AssemblyAI's Universal-3.5 Pro Realtime model as the speech-to-text engine within Vapi, emphasizing its market-leading accuracy for voice agents, particularly in recognizing complex alphanumeric entities and domain-specific vocabulary through keyterm prompting. With a low word error rate of 6.99% on Pipecat's benchmark and a latency of around 150 ms, this model is ideal for real-time applications. Setting up a Vapi agent using AssemblyAI involves minimal configuration: adding an API key, selecting the transcriber and model, and optionally customizing for multilingual support. The Universal-3.5 Pro Realtime model supports 18 languages and includes features like Context Carryover, enhancing its suitability for varied conversational contexts. The model is priced at $0.45 per hour for transcription, with no minimum commitment, and Vapi's platform and other provider fees are billed separately. The transition from older model identifiers to "universal-3-5-pro" is scheduled by September 2026.

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