6 best orchestration tools to build AI voice agents in 2025

In 2025, the development of AI voice agents is significantly enhanced by orchestration tools, which seamlessly integrate essential components such as speech-to-text, large language models, and text-to-speech technologies. These tools are pivotal in transforming impersonal IVR systems into conversational interfaces that can understand natural language, maintain context, and deliver human-like responses. As 70% of contact centers aim to implement voice AI by the end of 2025, six standout orchestration platforms offer unique advantages: Vapi combines visual design with API flexibility, LiveKit and Pipecat provide open-source customization, Retell emphasizes natural conversation flow, Synthflow enables no-code deployment, and Bland focuses on self-hosted security for sensitive data. AssemblyAI's speech-to-text API plays a crucial role in these systems, offering ultra-low latency and high accuracy for seamless conversational experiences.