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Justin Uberti
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@juberti

Justin Uberti

@juberti
Head of Realtime AI @OpenAI. Created WebRTC. Past: Distinguished Engineer @google, AIM. Amateur mathematician/musician.
Seattle, WA
juberti.com
Joined February 2007
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  • Pinned
    @juberti
    Justin Uberti
    @juberti
    Aug 3
    Just posted our technical deep dive on the GPT-Live system, by @zahanm and yours truly.
    @OpenAI
    OpenAI
    @OpenAI
    Aug 3
    GPT-Live can listen while it speaks. To make that feel natural at ChatGPT scale, we rebuilt the voice stack from client to model. This new architecture keeps audio flowing continuously, so deeper reasoning and tool use don't interrupt the conversation.
    Image
    34
  • @juberti
    Justin Uberti
    @juberti
    Aug 18
    Real artists ship. Congrats to Gavin and the @Etched team on a remarkable milestone!
    @Etched
    Etched
    @Etched
    Aug 18
    We've raised $700M at a $21B valuation from Jane Street, Kleiner Perkins, Sequoia, A16Z, Peter Thiel, BCV, and Blackstone. We're also excited to share that we've shipped our first rack to Jane Street.
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    00:00
    6
  • @juberti
    Justin Uberti
    @juberti
    Aug 6
    One other WebRTC thing we did for GPT-Live: we worked with @_pion to build a production-quality Opus decoder in Go, and are now using it in our systems. It supports the full Opus bitstream, has performance close to the C version, and is much more secure!
    Image
    GitHub - pion/opus: Pure Go implementation of Opus
    From github.com
    5
  • @juberti
    Justin Uberti
    @juberti
    Aug 6
    If you're interested in using WARP (faster startup for WebRTC) in your web app, most of the benefits are available today. Chrome supports DTLS 1.3, and you can enable SNAP (SCTP speedup) via an origin trial.
    datatracker.ietf.org
    WebRTC Abridged Roundtrip Protocol (WARP)
    This document outlines a set of improvements to the WebRTC session setup protocols aimed at significantly reducing connection setup latency. This improved setup mechanism is known as the WebRTC...
    2
  • @juberti
    Justin Uberti
    @juberti
    Aug 5
    @pion has a spiffy new web page pion.ly
    Image
    1
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