Vapi opens GPT-Live beta to all customers, splitting voice agents into speaker and reasoner

Vapi has opened its GPT-Live beta to every Vapi customer, after a limited beta last month with OpenAI's full-duplex speech-to-speech model. On Vapi the model runs as a speaker that handles the whole call and delegates lookups or actions to a separate reasoner model, with the handoff controlled through two prompts instead of one. Existing phone numbers, tools, tests and observability carry over, the transcriber config is dropped, and the voice switches to one of OpenAI's 22.