Google's new voice model keeps talking to you while it goes off and does the work
The hardest problem in voice assistants is not understanding you. It is the silence while the thing thinks. Google's answer is not to think faster; it is to keep talking.
On 15 September Google released Gemini 3.8 Live and Gemini 3.8 Live Extended Thinking, speech to speech models, meaning audio goes in and audio comes out with no transcript in between. Both execute tools and API calls in the background while the conversation continues, so checking a booking no longer stops the call. Extended Thinking reasons while it speaks and says so out loud. Google reports it first on the Artificial Analysis Speech to Speech Quality Index at 82.6, with 68.6% on tau-Voice, a benchmark that scores whether a voice agent actually finished the task, 35.1% on Sierra's banking version of it, and 97.7% on Big Bench Audio. The models detect and switch between 97 languages inside one conversation. They are live in the Gemini API and AI Studio, in Search Live, Gemini Live and Workspace for Pro and Ultra subscribers, and in private preview for Gemini Enterprise.
Why this one is different
Latency in voice assistants has been fought with smaller models, faster chips and shorter answers, all of which cost quality. This trades the appearance of latency instead of the latency itself. A model that can say let me check that and then actually check it is doing what a person on a phone does, and it is the first release where the interesting number is not time to first token but whether the task got done: tau-Voice scores completion, not fluency.
The fix for the silence is not speed. It is conversation.
How we got here
- 13 Aug 2026Gemini 3.7 Flash ships at an introductory price that doubles on 1 January 2027.
- 2 Sep 2026Gemini 3.8 Flash arrives at $0.75 per million input tokens, plus a cyber twin you have to apply for.
- 14 Sep 2026Apple ships Siri AI, built with Google's models, on iOS 27.
- 15 Sep 2026Gemini 3.8 Live and Live Extended Thinking, at the top of the speech to speech index.
What it does and does not mean
Every number here is Google's, on a board Google chose. Artificial Analysis is independent, but the selection of which index to lead with is not, and the published price covers Gemini 3.8 Live; Google has not separately published what Extended Thinking costs, so the cheap per minute figure and the top score do not yet belong to the same model. Read against the week, though, the shape is hard to miss. In two days Google put its models inside Apple's assistant and took the top of the voice board, which are the two places voice actually happens: the phone you own, and the support line you call.