OpenAI launches GPT-Live outbound phone calls API at $0.05 per minute

Developers can now have GPT-Live voice agents dial real phone numbers through SIP providers like Telnyx and Twilio OpenAI’s voice AI can now pick up the phone and make the call itself. On November 4, 2026, the company announced general availability of its GPT-Live outbound telephony API. Developers can now point GPT-Live voice agents at real phone numbers and have them dial out. The calls run through compatible SIP trunk providers. What OpenAI actually shipped The core feature is outbound calling over SIP, short for Session Initiation Protocol. Think of SIP as the switchboard operator of internet-based phone calls. It sets up the connection, manages it, and hangs up when everyone is done. Developers don’t need to build that plumbing themselves. They connect GPT-Live to a SIP trunk provider, which links to the traditional phone network. Named launch partners include Telnyx and Twilio. Ozonetel has also been confirmed as a supported provider. The external providers handle PSTN termination, meaning they carry the call onto the public switched telephone network. OpenAI keeps control of the audio processing and session logic on its side of the line. The calls are full-duplex. Both sides...