Google's[2][3] post is dated "Sep 15, 2026" and says "3.8 Live is rolling out starting today"; 9to5Google's[5] report of the same day says "Google today announced Gemini 3.8 Live and Gemini 3.8 Live Extended Thinking", and the Gemini API changelog lists both as generally available on September 15.
Google releases two real-time voice models: Gemini 3.8 Live, built for low-cost fluid dialogue that sees through the camera and switches among 97 languages, and 3.8 Live Extended Thinking, which reasons while it speaks and tops Artificial Analysis' speech-to-speech quality index at 82.6.