Amazon Nova 2 Sonic
Nova 2 Sonic is Amazon’s real-time speech-to-speech model designed to deliver natural, flowing voice interactions without relying on separate systems for text and audio. It combines speech recognition, speech generation, and text processing in a single model, enabling smooth, human-like conversations that can shift effortlessly between voice and text. With expanded multilingual support and expressive voice options, it produces responses that sound more lifelike and contextually aware. Its one-million-token context window allows for long, continuous interactions without losing track of prior details. It supports asynchronous task handling, meaning users can continue speaking, change topics, or ask follow-up questions while background tasks, such as searching for information or completing a request, continue uninterrupted. This makes voice experiences feel more fluid and less bound by traditional turn-based dialog constraints.
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Retell AI
Retell AI is an advanced platform that enables businesses to build, test, deploy, and monitor AI-powered voice agents for seamless customer interactions. With features like call transfer, appointment scheduling, and knowledge base synchronization, it allows for the creation of lifelike conversations with minimal latency. The platform supports integration with various telephony systems and offers multilingual capabilities, making it suitable for global operations. Retell AI's scalable infrastructure ensures reliable performance, handling high call volumes efficiently. Additionally, it provides robust monitoring tools to analyze call performance and user sentiment, facilitating continuous improvement of voice agents.
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Gemini 2.5 Flash Native Audio
Google has released updated Gemini audio models that significantly expand the platform’s capabilities for natural, expressive voice interactions and real-time conversational AI with the introduction of Gemini 2.5 Flash Native Audio and improved text-to-speech technology. The updated native audio model powers live voice agents that can handle complex workflows, follow detailed user instructions more reliably, and maintain smoother multi-turn conversations by better recalling context from previous turns. It is now available across Google AI Studio,Gemini Enterprise Agent Platform, Gemini Live, and Search Live, enabling developers and products to build interactive voice experiences such as intelligent assistants and enterprise voice agents. In addition to the real-time voice improvements, Google enhanced the underlying Text-to-Speech (TTS) models in the Gemini 2.5 family to offer greater expressivity, tone control, pacing adjustments, and multilingual support.
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Telnyx
Telnyx is a global communications infrastructure platform that provides voice, messaging, networking, and AI-powered real-time communication capabilities through a fully owned telecom stack. The platform combines carrier-grade networking, programmable identity systems, AI inference, and low-latency communication infrastructure to support real-time conversational AI agents and enterprise communication workflows. Telnyx owns and operates its entire network stack, including physical infrastructure, mobile core systems, edge processing, and AI compute layers, enabling faster performance and lower latency without relying on third-party telecom providers. The platform offers tools such as voice agent builders, speech-to-text, text-to-speech, global phone numbers, AI orchestration, and programmable compliance controls for building intelligent voice and messaging systems.
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