Vapi, LiveKit, Retell and Pipecat differ by orchestration layer

AssemblyAI’s comparison argues that Vapi, LiveKit, Retell and Pipecat are not direct substitutes, but different layers in a production voice-agent stack, with the main choice being how much of the pipeline a team wants to own. In the source article published Oct. 13, 2026, AssemblyAI describes Retell as a managed, low-code phone-agent platform; Vapi as an API-first orchestrator; LiveKit as open-source WebRTC transport plus an agent framework; and Pipecat as an open-source Python pipeline that developers assemble themselves.

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