Fish Audio launches Fish Agent on Live 3 full-duplex voice

Fish Audio, a company that makes AI voices, has launched Fish Agent, a no-code platform for building AI voice agents that answer and place phone calls (launch post). Builders describe the agent they want, attach a phone number, documents and API tools, and the agent can look up an order, book a slot or hand the call to a person with a summary. The part Fish presents as new is the voice model underneath, Live 3, which it calls full-duplex: it keeps listening while it speaks.

In the launch video, Fish describes the usual design as a relay. One model turns the caller's speech into text, a language model writes a reply, another model turns that reply back into audio, and a separate component keeps guessing when the caller has stopped talking. Fish argues that this is why such calls feel unnatural, and that it is an architectural problem a better prompt cannot fix. Its Live 3 announcement says the model was trained on real human conversations to learn when to acknowledge, wait, respond or stop. A caller reading out a phone number in chunks should hear "mm-hmm" and a pause rather than an interruption; a caller who says "yeah" while the agent lists opening hours should not stop it, while "Wait, actually, I just need Thursday" should. Fish says Live 3 can decide to respond in as little as 186 milliseconds. Live 3 handles the timing; the agent's instructions, knowledge and tool calls are still worked out by a language model, and builders can choose among hosted models or connect their own.

All of this is Fish's own account. The examples are company demos, including a staged call between two AI agents, and no independent test of turn-taking was available. Live 3 speaks only English for now. On the product page, Fish lists Live 3 at $0.035 a minute, half its $0.07 list price until December 31, 2026, plus $0.01 a minute for phone calls and $1.20 a month for a number; it also supports the older relay design, which it calls cascaded. The practical question for a business is whether an agent that tolerates pauses and corrections handles orders and bookings with fewer restarts, and that remains to be shown outside Fish's own demos.