Microsoft VibeVoice: Open-Source Frontier Voice AI

(github.com)

145 points | by tosh 3 hours ago

23 comments

  • maxloh 2 hours ago
    I think we should stop calling this type of models open source. They are indeed "open weight." The training code is proprietary and never revealed.

    https://github.com/microsoft/VibeVoice/issues/102

    • simonw 26 minutes ago
      I'm reserving that complaint for "open source" models which are released under non-open-source licenses.

      I care that I know what I can DO with the project when I see it described as "open source".

      • yjftsjthsd-h 20 minutes ago
        > I care that I know what I can DO with the project when I see it described as "open source".

        Yes, the first of which is that you should be able to build it from source. Which requires the source code, and in this case data.

      • data-ottawa 8 minutes ago
        That would be “permissive license”

        Maybe we should have a little cue card for models: vendor/name, size, open weights, open source, permissive license.

        It’s simple enough an idea.

    • jcmfernandes 1 hour ago
      Indeed. We now live in a world where freeware is named open source. We are very sorry, Stallman.
      • MarsIronPI 1 hour ago
        If you're going to apologize to Stallman, you should apologize for conflating open source with software freedom. ;D
        • jcmfernandes 24 minutes ago
          I totally get you, but this is yet another thick layer away.
        • psychoslave 47 minutes ago
          With free libre software, where freedom and liberty are about what the end user is empowered with actually, the software is mostly metonymic. Free software, free society, because there are free people in the middle of course.
          • jrm4 43 minutes ago
            Right, as I said elsewhere, maybe let's just let "open-source" have it.

            "Open-source" can be "anything you can go out and grab a copy of and use" but doesn't give you much legal certainty about any of it, and reserve "free software" for the other, better thing.

            • hedora 18 minutes ago
              But, free software lost it's way around GPLv3. From the end user's perspective, GPLv3 says that you can only use the software if it's either a cloud service, on hypothetical open firmware devices, or if you install it yourself.

              AGPLv3 partially solves the issue by blocking people like Google from using it to build proprietary cloud services that take away their users' freedom. (It still doesn't solve the problem where providers use network effects to achieve the same end game.)

              • MarsIronPI 13 minutes ago
                > From the end user's perspective, GPLv3 says that you can only use the software if it's either a cloud service, on hypothetical open firmware devices, or if you install it yourself.

                What in the world do you mean?

    • JumpCrisscross 2 hours ago
      > we should stop calling this type of model open source. They are indeed "open weight”

      This ship has sailed. It’s now in the same category as hacker/cracker and the pronunciation of GIF.

      • andy_ppp 1 hour ago
        I think you mean GIF.
      • giancarlostoro 1 hour ago
        It's the same as GIS, you wouldn't say jizz now would you?
        • DoctorOW 1 hour ago
          I absolutely do, every single time it comes up.
        • ziml77 47 minutes ago
          I hadn't thought about how to pronounce GIS, but do you have a problem with the pronunciation of the Japanese Industrial Standards: JIS?
          • s20n 22 minutes ago
            I've been pronouncing both of them as /dʒis/ like hiss and not /dʒɪz/. I however am not a native english speaker of English. I wonder if native speakers gravitate towards the z more?
        • kevin_thibedeau 1 hour ago
          The developer of the format declared the pronunciation 30+ years ago. It has always been jif.
          • Geezus_42 1 hour ago
            Yeah, but society overruled them.
        • dijksterhuis 1 hour ago
          i am absolutely going to from now on
        • notabotiswear 1 hour ago
          I take it that you haven’t met the Arcgees people…
        • pardon_me 1 hour ago
          How do you pronounce giraffe?
          • giancarlostoro 30 minutes ago
            Same way I pronounce my first name btw ;) but I think of "gif" as "gift" and this is probably the subconscious association people make without realizing it.
          • parineum 1 hour ago
            How do you pronounce gift?
          • briffle 41 minutes ago
            gorge = george
      • WarmWash 1 hour ago
        And "hallucination" which should have been "delusion".

        Way early on (spring 2023) people tried to stop it, but no luck.

        • MagicMoonlight 31 minutes ago
          Why would it be delusion? It’s making something up which isn’t there and describing it.
          • WarmWash 28 minutes ago
            A hallucination is a false sensory experience.

            A delusion is a false mental belief.

            Basically hallucinations are false external things, and delusions false internal things. You hallucinate a pink elephant, you delude yourself into thinking trump won 2020.

    • bitvvip 41 minutes ago
      What you said makes a lot of sense. Free software should not be confused with open source
    • btown 1 hour ago
      At least it's MIT licensed! As much as non-open training data irks me, restrictive licensing irks me more!
    • scotty79 12 minutes ago
      Open weights is not exactly right either because we do get source of the software that uses those open weights.

      Maybe open inference?

      But we often also get source code for fine tunning the model.

      So maybe it's closer to open source than to anything else?

      Isn't it a bit like not calling a game open source because engine tooling used to made it isn't open source and they didn't publish .psd files with asset designs?

    • giancarlostoro 1 hour ago
      I mean, you have "AI" which means just about anything in marketing speak, "Agentic" is kind of becoming similar, hopefully they don't goof that one too badly, would be nice to know what you are trying to sell me. Used to be "Cloud" meant storage not just hosting (I guess it still does).

      Then there's "Smart" in front of Car, Phone, TV, and so on... Meaning different things.

      I do think "Open Weight" should be more commonly used. There's definitely communities that spring up that build the training infrastructure and inference infrastructure around open models on the other hand.

    • jrm4 45 minutes ago
      I'm genuinely torn on this one; I get technically why not, but why I think I have no problem with it is the wishy-washiness of "open source" generally.

      As I teach this stuff to people newer to this tech, it's probably just easier and more helpful to refer to the wide array of "stuff you can just download and use yourself" as "open-source" and then after that, go deeper and talk about why Stallman was right, how "Free Software" was first. etc.

    • notabotiswear 1 hour ago
      Openwashing is the new greenwashing, which, coincidently, seems to have gone out of fashion a few hundred datacentres ago.
      • dist-epoch 1 hour ago
        it was replaced with abundancewashing
        • Geezus_42 1 hour ago
          What is "abundancewashing"?
          • dist-epoch 51 minutes ago
            > “This means a future of abundance. A future where there is no poverty, where people can have whatever they want in terms of goods and services.” – Elon Musk

            > “I think we see a path now where the world gets much more abundant and much better every year.” – Sam Altman

            https://www.diamandis.com/blog/elon-sam-abundance

  • steinvakt2 2 hours ago
    This is not a new model. Also, it hallucinates a lot. Also, it's very heavy and slow in inference. It's also bad in multilingual.

    Edit: I'm talking purely about speech to text (STT). Not sure about the other things this can do.

    • scotty79 9 minutes ago
      You just saved me an afternoon.
    • gagan2020 15 minutes ago
      It is not good for text to speech (TTS) as well. I am trying it for few days. First of all 1.5B model documentation is not there. 0.5B realtime is shit model. I was converting text, line by line and it was randomly adding music and couldn't handle special characters like "…".

      I really disappointed with this model to say the least.

    • lblock 2 hours ago
      Yeah, I don't get why it is suddenly getting so much attention today, it is all over twitter too
    • SecretDreams 1 hour ago
      I think this was all covered when they said it was released by Microsoft?
      • NobleLie 1 hour ago
        The nuance is lost on LLM agentic dominant partakers.
  • aqme28 1 hour ago
    Interesting to see "vibe" enshrined by the likes of Microsoft as an AI product word.
    • accrual 1 hour ago
      Especially when "vibe coded" can have a negative connotation meaning quickly put together without understanding.
      • ryandrake 4 minutes ago
        In my mind, Vibe-anything means "some slop carelessly thrown together to ship as fast as possible." Wild that it's being used in a serious product name!
      • Barbing 1 hour ago
        I’m just surprised they put the name of the e-waste slop company in their product
    • altmanaltman 1 hour ago
      Which makes it even more weird they get offended when people use Mircoslop. They are the ones leaning into the marketing
      • Vinnl 49 minutes ago
        "get offended" is just what the clickbait news cycle made of it. It was based on the post at [1], and this is all it said:

        > We need to get beyond the arguments of slop vs sophistication and develop a new equilibrium in terms of our “theory of the mind” that accounts for humans being equipped with these new cognitive amplifier tools as we relate to each other

        [1] https://snscratchpad.com/posts/looking-ahead-2026/

        • altmanaltman 32 minutes ago
          When a CEO says "We need to get beyond the arguments of X" it is universally a polite, PR-scrubbed way of saying, "Please stop talking about X, it is hurting our business" which is how the media interpreted it.
  • xnx 31 minutes ago
    Still waiting for the open weights model that conclusively beats the multi-year old Whisper in accuracy, features, and performance.
    • scotty79 7 minutes ago
      It's crazy that a lot is happening in open models for stt, but there's very little progress when it comes to results, esp multilingual.
  • Void_ 2 hours ago
    I the past month or so, I added 2 models to my app Whisper Memos (https://whispermemos.com):

    - Cohere Transcribe (self hosted)

    - Grok Speech To Text (they provide an API, only $0.10/hr!)

    They are both excellent. I'm not sure about this one. Would you like to see it in a consumer speech to text app?

    • olejorgenb 2 hours ago
      I've had good experiences with the Mistral Voxtral models (I've used the API, but some of the model-variants are open weight)
    • Barbing 1 hour ago
      Does Cohere work with longer transcripts? Do you have to do some magic to merge recordings over 35 seconds long?
    • 2ndorderthought 2 hours ago
      Have you tried qwen?
    • SecretDreams 1 hour ago
      Any non-Musk alternatives that are comparable in quality and cost?
      • jayphen 1 hour ago
        Voxtral competes on price ($0.003/min) and quality. Speechmatics has best in class accuracy but is a bit more expensive ($0.004/min)
      • Void_ 1 hour ago
        Our default is still OpenAI Whisper. Grok is just a choice for users who might prefer it.
  • embedding-shape 2 hours ago
    Isn't this project the one Microsoft published but then soon after pulled it for security/safety reasons? What has changed since then?
    • 542458 2 hours ago
      Look at the "News" section in the readme - The original TTS model is gone from this repo (you can still find it other places), but the SST/ASR, long form TTS, and streaming TTS models are newer.
    • infecto 1 hour ago
      It’s confusing (at least for me) because the project covers a number of things including what you are mentioning.
      • Barbing 1 hour ago
        [off topic]

        When explanations get posted directly in HN comments, I imagine someone somewhere in the world is able to learn in spite of their Internet restrictions/firewalls

        People will also post their own interpretations in response to comments, and quickly find out they missed something.

        … But if you try to automate it, like include a summary under every HN post, you encourage laziness too much and are pre-chewing too heavily. Some balance here.

        [on topic]

        (OK I’m done making excuses, time to read the article… thanks for the encouragement!)

        I thought this was not explained in the readme directly but in fact I missed it. I wasn’t going to read Microsoft entire changelog! But it was substantive, thanks to sibling commenter:

        “2025-09-05: VibeVoice is an open-source research framework intended to advance collaboration in the speech synthesis community. After release, we discovered instances where the tool was used in ways inconsistent with the stated intent. Since responsible use of AI is one of Microsoft’s guiding principles, we have removed the VibeVoice-TTS code from this repository.”

  • CubsFan1060 2 hours ago
    Great post last night from Simon: https://simonwillison.net/2026/Apr/27/vibevoice/
    • 542458 2 hours ago
      Note that this just covers the Speech-to-Text/Speech-Recognition aspect (a-la whisper), there's also models for long-form Text-To-Speech and steaming Text-To-Speech.
    • JumpCrisscross 1 hour ago
      “VibeVoice can only handle up to an hour of audio”

      Why?

  • Anonyneko 2 hours ago
    You have selected Microsoft Sam as the computer's default voice.
    • accrual 1 hour ago
      My friends and I had fun in the computer lab with Microsoft Sam, inputting long strings of characters to create funny sound effects. Sususususususu.
  • ryukoposting 1 hour ago
    Holy moly, a Microsoft AI product that isn't named Copilot!
  • frangonf 1 hour ago
    I took a look into local options for ASR and diarization some months ago, I missed that VibeVoice now has this feature.

    My conclusions back then (which only came from a shallow research on the topic and 0 real experience mind you) was that Whisper + Pyannote was the "stable" approach.

    Have the VibeVoice, Voxtral, Qwen or the Nemo solutions caught up in segmentation and speaker recognition?

  • podgietaru 2 hours ago
    So we've really just settled on Vibe as the verb for AI then?
    • giarc 2 hours ago
      I'd be willing to bet it will be "Word of the Year" for 2026. Merriam-Webster had 'slop' for 2025, and 'polarization' for 2024. Is there a prediction market for this?
      • internet_points 1 hour ago
        it'll probably be something we're not even talking about yet - we still have 7 months in which to make the world even worse
    • pryanshu89 2 hours ago
      Why use precise technical language when you can just vibe with your AI system?
  • JumpCrisscross 1 hour ago
    What’s the current state of the art, for each of training locally and in the cloud, for learning my voice?
    • yreg 1 hour ago
      Locally maybe https://voicebox.sh/

      Elevenlabs in the cloud.

    • chrsw 1 hour ago
      Local? No idea. Cloud? Eleven Labs, probably. But it's described as "cloning" not "training". Not sure what the distinction is or why it matters if the end result is you can to generate any TTS that sounds like you. There might very well be an important one, I just don't know it.
    • khimaros 1 hour ago
      open weights i would say S2: https://github.com/rodrigomatta/s2.cpp
  • pluc 2 hours ago
    Interesting story about this repo/product/author by cybersecurity researcher Kevin Beaumont: https://cyberplace.social/@GossiTheDog/116454846703138243
  • Mobius01 59 minutes ago
    Microsoft has historically made poor choices in product naming, but this has to be a new low.
  • BlastBash192 1 hour ago
    Maybe Microsoft’s real strength was never making the best model, it was knowing you don’t need to, as long as you own the platform everyone builds on.
  • khimaros 1 hour ago
    looks like this offers ASR support in GGUF https://github.com/CrispStrobe/CrispASR -- haven't tested
  • chaosprint 1 hour ago
    Microsoft Store App Vibing.exe Accused of Harvesting Screens, Audio, and Clipboard Data:

    https://cyberpress.org/microsoft-store-app-vibing-exe-accuse...

  • Zopieux 26 minutes ago
    English only?
  • mistic92 2 hours ago
    For me its giving me very poor results
  • ChrisArchitect 1 hour ago
    • simonw 22 minutes ago
      That was about the text-to-speech model, the speech-to-text one was release in January.
  • starkeeper 1 hour ago
    Microsoft is famous for choosing terrible names but how could they be this terrible.
  • walthamstow 2 hours ago
    Seems quite heavy for a STT model, Parakeet and Whisper are much smaller and perform great for quick dictation and transcription of longer files. I guess that's due to additional accuracy and speaker diarisation?

    The TTS example clip in the repo of 'spontaneous singing' is creepy as fuck