How OpenAI delivers low-latency voice AI at scale
127 points by Sean-Der 3 hours ago | 61 comments

Sean-Der 2 hours ago
Very grateful that OpenAI published the article/publicized their usage of Pion[0] a library I work on. If you aren't familiar with WebRTC it's a super fun space. I work on a book WebRTC for the Curious [1] that details how it works.

[0] https://github.com/pion/webrtc

[1] https://webrtcforthecurious.com

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haaz 3 minutes ago
Only a software dev would start their referencing at 0 lol
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vorticalbox 38 seconds ago
I do this too I never made the connection.
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aleda145 44 minutes ago
Appreciate you putting the entire book online!

I read parts of it a while ago when I had an idea on using webRTC data channels to pass data from databases to browser clients via a CLI. Your book made me understand that it's probably not a great fit for my use case. I just used a centralized control plane and websockets instead.

I still feel like there is something fun that we can do with webRTC data channels + zero copy Apache Arrow arraybuffers + duckdb WASM, but haven't figured it out yet

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dtran 56 minutes ago
Thanks for WebRTC for the Curious and for Pion! Not using the latter directly, but have used both to better understand WebRTC
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thatxliner 2 hours ago
slightly unrelated but what’s with storing the entire codebase in the root directory instead of a nested src folder? It makes getting to the README a lot more difficult
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nemothekid 60 minutes ago
Thats the default for go projects. Go imports are repository strings (e.g.):

     import ("github.com/go-sql-driver/mysql")
so it's standard to have the library files in the root directory.
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a456463 56 minutes ago
This is valid criticism. Go fanbois don't like listening to any go criticism. They were all like who needs templates in go. and now go has templates.

To me go code looks like somebody vomitted stuff in the root dir and i have to wade through that every time. No namespacing. nothing

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thefounder 16 minutes ago
Usually the projects are small and don’t need a lot of “namespaces”/sub-packages but larger projects do use sub packages and a lot of neat stuff(i.e “internal” packages).

Go provides you all the tools to organise your code as much as you want (I.e vanity domain names, meta tags so that you can import a package such aol.com/hello domain even if your package is in github.com/xha/src/pkg/aol

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junon 29 minutes ago
I don't like go as a personal preference but reducing them to "fanboys" is a bit reductive. I'm sure the same could be said about your own favorite language.
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altmanaltman 12 minutes ago
Is it reductive when its describing a group of people that like something and refusing to hear any ill of it? The comment wasn't shade at people using the language in general.

And you're right, fanboys are in every language. But resorting to changing the argument by whataboutism is a bit reductive.

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legohead 2 hours ago
The low latency is more of a pain point than a good thing, the way they have it implemented. Trying to have a casual conversation with it, as humans we naturally pause, and GPT will take this as you are "done" and start blabbing away.

I also suffer from finding the appropriate word I want as I've gotten older and slower, and this fast-voice-gpt just ends up frustrating me more than helping. I have to sit there and think out the whole sentence in my head before I say anything -- not very natural.

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zamadatix 2 hours ago
I think these are 2 different layers of "latency". The latency in the article is referring to the transport of the audio stream itself while the latency in your scenario is about how quickly to start responding inside the audio stream.
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janalsncm 43 minutes ago
I’ve also experienced this and it’s really annoying. There is this pressure to keep talking if I’m not done with my thought that feels pretty unnatural at least for me. If I’m searching for the right word, I want the opportunity to find it.

I think the solution is to handle pauses more intelligently rather than having a higher latency protocol. With low latency you can interrupt and the bot can immediately stop rambling.

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saturdaysaint 48 minutes ago
In voice conversations I tell it not to reply at all or only say “Understood” until I use some kind of code word. Not perfect, but less intrusive.
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dtran 15 minutes ago
This has more to do with Voice Activity Detection (VAD) than the latency described in the article
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richardw 2 hours ago
Hard problem. I find myself adding in filler to stop the thing from jabbering.

I also think it spends most of its iq on sounding good rather than thinking about the problem. “Yeah absolutely I can see why you’d like to…” etc. This is likely because it’s on a timer and maybe voice is more expensive to process? Text responses spend more time on the task.

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asdfman123 18 minutes ago
Fwiw you can prompt it to respond differently to you.
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throwuxiytayq 48 minutes ago
With higher latency this would be even more of an issue. When you pause and start talking again, the model wouldn't catch that until it has already interrupted you.

The actual implementation is at fault. I had some luck with instructing the model to only respond with "Mhm" until I've explicitly finished my thought and asked it a question. Makes this much less of an issue.

But I've decided that their voice mode is completely unusable for a different reason: the model feels incredibly dumb to interact with, keeps repeating and re-phrasing what I said, ends every single answer with a "hook" making the entire interaction idiotically robotic, completely ignores instructions when you ask it to stop that, and - most importantly - doesn't feel helpful for brainstorming. I was completely surprised how bad it is in practice; this should be their killer app but the model feels incredibly badly tuned.

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MagicMoonlight 60 minutes ago
It’s possible to change the amount of time it waits if you’re using the API
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Barbing 56 minutes ago
[flagged]
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thimabi 3 hours ago
> Voice AI only feels natural if conversation moves at the speed of speech […] At OpenAI’s scale, that translates into three concrete requirements: Global reach for more than 900 million weekly active users

Surely the number refers to the total users of ChatGPT overall, and the fraction of those who use voice features is considerably smaller, is it not?

That’s the kind of thing that influences business decisions like knowing how much hardware and software optimization to throw at a problem.

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stuartmemo 2 hours ago
Yeah, that's why they've used "reach" - the total number of users who could be exposed to the feature regardless of engagement.
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janalsncm 40 minutes ago
To defend them a little: voice is a little rough around the edges now, so there’s a chicken and egg problem of whether to prioritize improving voice if usage isn’t high partially because it’s clunky.
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Aeroi 3 hours ago
if anyone is looking to get into this. pipecat is a great open-source repo and community. https://github.com/pipecat-ai/pipecat
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pncnmnp 2 hours ago
I wish I had known about Pipecat a lot sooner. I found out about it a few weeks back, and since Gemma 4 launched, I've been building my own entirely local voice assistant using Gemma 4 + Kokoro TTS + Whisper from scratch - https://github.com/pncnmnp/strawberry.

Pipecat's smart turn model is really good for VAD - https://huggingface.co/pipecat-ai/smart-turn-v3

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zarldev 19 minutes ago
Yeah Gemma4 was and is great fun to do this with - I too am building pretty much the same as yourself in Go.

https://github.com/zarldev/zarl & https://www.zarl.dev/posts/hal-by-any-other-name

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AnthOlei 2 hours ago
What do you have going on the hardware side? I want to plug this into hass but don’t know what hardware I need for reasonable latency
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pncnmnp 48 minutes ago
The whole setup works on my M2 MacBook Pro with 16 GB RAM. I use Gemma 4B via LiteRT-LM.

I've found that LiteRT-LM has a much lower DRAM footprint than Ollama. I've also made tons of optimizations in the code - for eg, you can do quite a bit with a 16k context window for a voice assistant while managing a good footprint, so I keep track of the token usage and then perform an auto-compaction after a while. I use sub-agents and only do deep-think calls with them, so the context window is separated out. In a multi-turn conversation, if Gemma 4 directly processes audio input, the KV cache fills up within a few turns, so I channel it all via Whisper.

Also, by far the biggest optimization is: 3-stage producer-consumer architecture. The LiteRT-LM streams tokens and I split them into sentences. A synthesizer thread then converts each sentence to audio via Kokoro TTS - the main thread then plays audio chunks sequentially. There's a parallel barge-in monitor thread. https://github.com/pncnmnp/strawberry/blob/main/main.py#L446

I did not want to use openWakeWord or Picovoice because they had limitations on which wake word you could choose. Alternative was to train a model of my own. So I created my own wake word detection pipeline using Whisper Tiny - works surprisingly well: https://github.com/pncnmnp/strawberry/blob/main/main.py#L143...

Also, I have VAD going with smart turn v3 (like I mentioned above) + I use browser/websocket for AEC + Barge-in (https://github.com/pncnmnp/strawberry/blob/main/audio_ws.py).

I'm using the MacBook's built-in microphones for this, though, and I haven't fully tested it with other microphones. I've been ironing out the rough edges on a daily basis. I should write a quick blog on this too.

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Sean-Der 2 hours ago
Check out [0]. You can do 'Voice AI' on small/cheap hardware. It's the most fun you can have in the space ATM :) It's been a while, but posted a demo here [1]

[0] https://github.com/pipecat-ai/pipecat-esp32

[1] https://www.youtube.com/watch?v=6f0sUEUuruw

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AnthOlei 57 minutes ago
beautiful demo - is it running fully locally or talking to 3rd party API’s? That box was jaw dropping small
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BoxedEmpathy 3 hours ago
I've been looking at this! Great project.
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Lucasoato 26 minutes ago
Wait a minute... I’m genuinely happy that they are sharing this, but keep in mind that realtime audio model from OpenAI are still stuck with the 4o family in terms of capabilities, sadly. I still find them so useful, such a pity that there’s no real competitor in this segment, having the experience a real conversation has helped me so much in expressing ideas and concepts.

Still, it’s worth to keep in mind that these are not frontier models, differently from when they were released.

(Please Sam, if you read this, release the new realtime audio models)

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didibus 2 hours ago
I wouldn't mind waiting longer for answers that would go through a better model with more thinking. As long as it has good support for interrupting and also it doesn't start answering as soon as I pause for 1 second and it's smart about knowing I'm done speaking.
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logickkk1 42 minutes ago
IMO this probably isn't just about latency. keeping people in voice gives them training data text never will. is that why they were fine going transceiver over sfu and mostly ignoring multi-party?
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qrush 2 hours ago
Am I reading this right that OpenAI is not using Livekit for WebRTC/audio anymore?
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fidotron 27 minutes ago
It does appear that way. The LiveKit server is not what you would want for this architecture anyway (as they basically say with the SFU discussion), although it does have a lot of useful stuff in the client SDKs.
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fuddle 13 minutes ago
They do link to the Livekit docs in the footnotes: https://docs.livekit.io/transport/self-hosting/kubernetes/
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tom1IIIl1iIL 36 minutes ago
I think it's better to join some kind of club if you want to make friends?
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charisma123 2 hours ago
If a transceiver crashes during a stream, how is the active session recovered? Does the system automatically re-establish the context in a new WebRTC session?
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Sean-Der 2 hours ago
It doesn't today, but you could with sometime like this [0]. You can save/suspend all WebRTC state and bring it back with the next process.

[0] https://github.com/pion/webrtc-zero-downtime-restart

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anzerarkin 3 hours ago
I hate the voice ai though, it's so much dumber
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NikolaNovak 3 hours ago
Fwiw - I found the advanced AI voice feature to be actually detrimental. It's good if you just want a single sentence answer. I've turned it off though when I want a more detailed, structured, considered answer.
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drusepth 2 hours ago
Interestingly, that kind of parallels the real world too: if you want a quick and high level answer, talk to someone in person; if you want something detailed and info-dense, get them to write it down.
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doctorpangloss 2 hours ago
what i learned from making a webrtc+kubernetes game streaming product:

- openai is wrong. almost of the issues they described are issues with libwebrtc, not with webrtc, kubernetes, network architecture, etc. the clue was when they said "the conventional one-port-per-session WebRTC model."

- there are no alternatives worth trying. everything else open source in the ecosystem, like pion, coturn, stunner, are too immature.

- libwebrtc is the only game in town.

- they haven't discovered libwebrtc feature flags or how it works with candidates, which directly fix a bunch of latency issues they are discovering. a correct feature flag can instantly reduce latency for free, compared to pay for twilio network traversal style solutions

- 99% of low latency voice END USERS will be in a network situation that can eliminate relays, transceivers, etc. it is totally first class on kubernetes. but you have to know something :)

this is the first time i'm experiencing gell mann amnesia with openai! look those guys are brilliant, but there is hardly anyone in the world who is doing this stuff correctly.

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chevman 36 minutes ago
When you have hard problems with unclear optimal solutions, taking this approach of a public show & tell will often (always?) solicit lots of interesting ideas the team may have not yet considered :)
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Sean-Der 2 hours ago
Did you use libwebrtc on the backend? When you say `libwebrtc` is the only game in town are you talking about clients or servers?

Even for clients you have things like libpeer that libwebrtc can't hit.

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jiggawatts 2 hours ago
Something I noticed is that companies that are vibe-coding their products miss out on the intelligence that (still) only humans can bring to bear. Just the knowledge cutoff alone puts AI at a serious disadvantage in any rapidly changing field.
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fragmede 57 minutes ago
GPT 5.5's knowledge cutoff is August 2025. Which aspect of WebRTC has meaningfully changed since then?
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flakiness 2 hours ago
Should I or shouldn't I be glad to see zero mention on Codex.
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mock-possum 2 hours ago
Shouldn’t, I think - advanced voice is a surprisingly slick feature, and if you’re someone who feels that they can think and speak more naturally than when they think and type, AI voice transcription is kind of huge.
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gyanchawdhary 2 hours ago
100% .. as a product designer/developer, i use it heavily for early feature ideation .. i’ll do a loose, exploratory back and forth on a long walk .. then pass the transcript to claude to validate and turn into a spec ..
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AIorNot 3 hours ago
so is the answer

WebRTC + Kubernetes

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rvz 2 hours ago
OpenAI uses Go for the networking implementation for the relays and the services, which makes a ton of sense, instead of something immature as TypeScript / Node or whatever.

Yet another reason to not consider anything else like that for low-latency networking. Golang (or even Rust and C++) is unmatched for this use-case.

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bananamogul 48 minutes ago
"something immature as TypeScript / Node or whatever"

Node.js's initial release was May 27, 2009

Golang 's initial release was November 10, 2009

They're different, yes, but it's not like

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mghackerlady 43 minutes ago
okay, sure, but one is by microsoft, the other by a 25 year old, and another by rob pike. The one by rob pike is going to be infinitely more mature and thought out than a hacky type system on JS because it isn't his first rodeo
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nvarsj 2 hours ago
Can golang do zero copy networking nowadays? In the past golang was terrible at this kind of thing due to allocations and copies of all relayed data.
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fragmede 56 minutes ago
And the GC!
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DumpoLumbo 59 minutes ago
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DumpoLumbo 58 minutes ago
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Dorrell 2 hours ago
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testing_auth 2 hours ago
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testing_auth 2 hours ago
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jonahs197 2 hours ago
Who cares? Their company is dying.
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cdrnsf 3 hours ago
It's missing the part where they explain how they obtained the training data for their voice AI.
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CrzyLngPwd 2 hours ago
It's bad enough having to speed-read the waffle of its written answers; even when told to be concise, the thought of having to listen to it waffle on in its smarmy, sycohpantic fashion makes me want to reach for the sick bag.
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furyofantares 2 hours ago
> Global reach for more than 900 million weekly active users

lol, definitely didn't need to know there's 900M weekly users for this post. I mean yeah, there's a lot of users and they serve globally, that's relevant. But this is just pulling out your biggest stat because you can. How many voice users you have would actually be relevant and interesting but, to baselessly speculate on motivation here, might be a number that doesn't add as much fuel to an upcoming IPO as reminded people that you're almost at a billion users does.

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