Decagon Introduces Alto to Control Voice Agent Conversations
What happened
On November 11, 2026, Decagon launched Alto, a new model designed to control the conversational flow of its duplex voice agent. Alto determines when the agent should speak and what it should say during customer calls. The company reported that Alto increased the rate of successfully resolved live calls by over five percentage points, while maintaining quick response times. Alto operates alongside Decagon’s existing reasoning model, allowing the agent to interact with callers while complex tasks are being processed in the background.
Key details
- Alto responds in about 700 milliseconds on average.
- Resolution rates on live customer calls increased by more than five percentage points after Alto was introduced.
- The rest of the voice agent’s logic was unchanged during the resolution comparison.
- Alto was tested on over 90 million simulated calls before being used in live settings.
- Alto focuses on deciding whether to answer immediately or wait for confirmation before responding.
Why it matters
Companies using Decagon’s voice agents can now resolve customer calls more efficiently, with a measurable improvement in resolution rates. Callers experience quicker and more interactive conversations, as the agent can keep them engaged while waiting for complex information. Businesses benefit from a system that can handle ambiguous situations and follow specific policies without sacrificing speed or reliability.