Justin Uberti
5.4K posts

Justin Uberti
@juberti
Head of Realtime AI @OpenAI. Created WebRTC. Past: CTO @ultravox_dot_ai, Distinguished Engineer @google (Stadia, Meet/Duo), AIM. Amateur mathematician/musician.




From an AI user perspective, the four big leaps so far in ability: 1. GPT-3.5 (ChatGPT, November 2022) 2. GPT-4 (Spring 2023) 3. Reasoners (starts with o1-preview, but the real deal was o3, Spring 2025) 4. Workable agentic systems (Harness + good reasoner models, December 2025)







@juberti been experimenting with things like this and realtime-1.5 it's pretty fun and makes it engaging

@juberti Agree, nice option. Just hoping for a legit voice model intelligence update eventually. Tbf OpenAI has been ahead of all the other AI lab voice models for over 1.5yrs now which is impressive

@juberti Hi Justin, I tested it early in the morning. Will the final model be more expressive in terms of its tone variation and voice volume? It doesn't slow down the speed of its speech as much I would like and doesn't whisper. Also, it doesn't sing when asked to.

Voice workflows just got stronger with gpt-realtime-1.5 in the Realtime API. The model offers more reliable instruction following, tool calling, and multilingual accuracy. Demo with @charlierguo

NEW: Apple is preparing to allow voice-controlled artificial intelligence apps from other companies in CarPlay, a move that will let users query AI chatbots through its vehicle interface for the first time. bloomberg.com/news/articles/…

We learn to speak before we learn to read. Voice is the most natural interface we have. We just raised a $100M to make building voice AI as easy as a web app.







