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Tavus: The AI Human Platform

Tavus is building real-time AI humans — systems that can see you, hear you, and respond with natural expression, emotion, and context. What began as personalized video has grown into a full platform used by companies from startups to the Fortune 10. The team recently raised a $40M Series B to advance this vision, introducing PALs: agentic AI humans that can perceive, reason, and act on their own. In this conversation with YC’s Diana Hu, founders Hassaan Raza and Quinn Favret share how they made the leap from generative video to real-time AI humans, the foundational models behind rendering and perception, and why they believe AI humans will become the next major interface for work and communication. Learn more about Tavus at https://www.tavus.io. Chapters: 00:24 – From Personalized Video to AI Humans 01:18 – Why Real-Time Matters 02:36 – How AI Humans See, Hear, and Respond 04:05 – Introducing PALs: Agentic AI Humans 05:42 – The Foundational Models Behind Tavus 07:28 – Building Emotion, Expression, and Context 09:10 – Use Cases From Startups to the Fortune 10 11:00 – Raising the $40M Series B 12:52 – The Future: AI Humans as the Next Interface

Diana HuhostHassaan RazaguestQuinn Favretguest
Nov 14, 202515mWatch on YouTube ↗

EVERY SPOKEN WORD

  1. 0:000:24

    Intro

    1. DH

      [upbeat music] I'm excited today to welcome the founders of Tavus, to Quinn and Hassaan, who just raised a 40 million Series B led by CRV. Tell us what Tavus does.

    2. HR

      We build AI humans. We're an AI research lab that focuses on teaching machines the art of how to be human, so teaching them to see,

  2. 0:241:18

    From Personalized Video to AI Humans

    1. HR

      hear, respond, act, even look like humans do.

    2. DH

      What does that look like? Can we take a look at a demo?

    3. HR

      Yeah, that'd be great. Here, we're about to talk with Charlie, one of our awesome Tavus pals, and it's really cool because, you know, you can video call them, you can audio call them, you can text them even. They're always on. They're thinking about you. They're agentic. You can-

    4. DH

      They look real, like a human.

    5. HR

      Yeah. Yeah, absolutely. And they can see you. They can react to all your expression and your emotions. They really feel like you're talking to a coworker or friend rather than a machine.

    6. DH

      And I think the impressive stuff is that this is all running in real time.

    7. HR

      Yeah, absolutely. It's all running in real time. Yeah.

    8. DH

      Let's actually see a very short clip of it interacting.

    9. HR

      Hey, what's up, Dom?

    10. SP

      Good morning, Hassaan. How may I assist you today?

    11. HR

      Yeah, can you tell me what my schedule's like for today?

    12. SP

      Certainly, sir. You are currently scheduled for a YC recording of some sort, followed by a 2:00 PM product meeting and a 3:30 investor call.

  3. 1:182:36

    Why Real-Time Matters

    1. HR

      Great. My recording's running over. Can you draft a quick email saying I'll be 15 minutes late to the product meeting?

    2. SP

      Right away, sir. If you check your email, I've already prepared a message informing them of your delay.

    3. HR

      Beautiful. Thanks.

    4. SP

      My pleasure, sir. Can I be of any other assistance today?

    5. DH

      Very cool, thank you.

    6. HR

      Yeah.

    7. DH

      That's, that was a cool demo. So tell us a bit about who are some of your top customers.

    8. HR

      We have a pretty awesome diverse set of customers, everything from, like, small startups to, like, Fortune 10 companies, uh, some of which are, like, Amazon, um, Better.com, Alibaba, that are using our interfaces and our models to build these really cool AI employees.

    9. DH

      What do these AI employees do? I think you mentioned you have three categories of types of applications?

    10. QF

      Yeah, so there's three big buckets that we really do a lot of work with. The first one is learning and development, so a lot of training, education, things like that. The second one is healthcare, so think patient intake, nutrition coaches, elderly companionship. And then the third bucket is go-to-market, so anything from an AI SDR to a AI solutions engineer to a customer support manager. So it's really across the board, and I think that's been part of the fun of building it, too.

    11. HR

      Yeah. It's, it's amazing to see all of the really awesome AI human use cases that we're seeing, um, people create. Like, just the craziest thing that we would never have imagined.

  4. 2:364:05

    How AI Humans See, Hear, and Respond

    1. DH

      So it's basically a virtual human that's doing all these tasks over, uh, video, right?

    2. HR

      Yeah. I, I mean, it's, you know, it's an AI human on video, um, but with, with the new updates, also we can, we can, it can video call you, it can audio call you, it can text you. It's, it feels like a coworker or friend.

    3. QF

      And for that to be the case, it needs to actually feel human, right? It needs to look like you, sound like you, understand, interact just like a human would and, and that's where, you know, it really, really gets its, its special touch.

    4. DH

      And there's a lot of custom use cases, so the way you guys work right now, you got to here with being a SDK where customers like Amazon, Alibaba, take your SDK and build-

    5. HR

      Mm-hmm

    6. DH

      ... the custom AI employee, right?

    7. HR

      Yeah.

    8. DH

      But that was not the case all the time, right?

    9. HR

      Yeah.

    10. DH

      I think when you guys went through the batch back in summer '21, this is, uh, way before the ChatGPT era. You were one of the OGs in AI before AI was a thing.

    11. HR

      Yeah.

    12. DH

      Tell us about that era.

    13. HR

      Well, we like to say that we were doing AI before it was a cool thing to do back in 2020 and 2021. Yeah, I mean, when we went through YC, it was, um... There was, there was not that much that you could do with the models of the time, right? And so we were, we were sort of limited by what we could create. And so at the time, the best that we could do with these generative models was do what we call, like, um, lip sync infill, which is like, you could, uh... And we used it for AI personalized video. So basically you could record one video saying, "Hey, Diana, saw you worked at YC," and then you could send out thousands that were all personalized, lip synced with your, with your voice that would say, "Hey there,

  5. 4:055:42

    Introducing PALs: Agentic AI Humans

    1. HR

      Alex, saw you worked at XYABC," right? That was what you could do at the time. You could create personalized video 'cause you could take a segment and, and really scale it up. Um, over time, though, of course, the models have evolved and our research has evolved to be able to do a lot more.

    2. DH

      You guys stayed the course in this direction because before you were selling this tool to sales team-

    3. HR

      Mm-hmm

    4. DH

      ... and then evolved into the SDK.

    5. HR

      Yeah.

    6. DH

      So tell us what was that pivotal moment.

    7. HR

      I mean, I think it was a few things. I think it was, um, really understanding who we wanted to be as a company, right? I think that, like, after we did our Series A, there was, like, this, uh, crucible moment where we're like, "Hey, are we going to be, like, an AI sales company, or are we going to be focusing on developing these models for, like, you know, like, human computing, essentially? Like, to develop the next generation models for, like, human behavioral analysis and simulation." And we decided that, hey, like, we don't wanna go down the path of being an AI sales company. That's not, just not the DNA of our team. It's not who we are. And ultimately, we didn't really think that we c- we personally could make a massive business with that. And so we decided to take the path of saying, "Hey, we're actually gonna take a step back, and we're gonna go and focus on building the models and serving these as a next generation interface and as an API that you can consume and build on."

    8. QF

      I think a lot of it came back to our core, too. I think, you know, we went through the YC batch and it was, you know, we were pushing, we were trying to get as much momentum as possible and, and build, build, build. And we got a ton of customers that came to us looking for very specific things, which was awesome at the time. And then at the end of the summer, we took that step back and said, "Wait a sec. Like, okay, these are, these are really cool customers to work with, but, like, is this really who we are and what we want to be building?" And

  6. 5:427:28

    The Foundational Models Behind Tavus

    1. QF

      took that, took that really critical reflection and ultimately, you know, made that jump into the API and SDK side.

    2. DH

      The impressive thing is having the courage to take that leap because you essentially... I remember having this conversation. You churn all those-

    3. HR

      Yeah

    4. DH

      ... customers, and you were on the track to get Series A traction before all that.

    5. HR

      Yeah.

    6. DH

      And you were growing quite quickly. And to say, "That is not the path, and our DNA are more extremely technical." You had some really impressive research work that you'd done. It was not to be a sales company, and to be now what you are becoming, a AI research lab, right, took a lot. And it was the right choice.

    7. HR

      Yeah.

    8. DH

      Evidently.

    9. HR

      Yeah, yeah.

    10. DH

      Because now-You are building foundation models not just for rendering, which is what it was before, and now also perception. Can you tell us about these two sides of the yin and yang?

    11. HR

      I mean, ultimately it came down to, like, we saw a larger vision that we could really... We wanted to pursue. And I think a lot of the team has had this vision for a long time around, you know, machines that, like, meet us where we are. Uh, instead of us having to learn how a machine talks, like, they can meet us so they can video call us, they phone us, text us. And in order to do that, in order to teach machines, like, the art of, of, like, what this is, like, this is, like, a dance, um, then just giving them the face isn't good enough. And also the f- the face won't be good enough ever unless you teach a machine to see the way that we see and teach them, like, perception, contextual perception. So we, we both... It was both necessity to make the rendering models better, but also part of, like, if we wanna build these AI humans, then they have to be able to see our expressions, our gestures, because we speak as much through our face and what we don't say as we do through our words. And so we really focused a lot on trying to collect all these signals that otherwise weren't collected before, um, and then make meaning out of them. So teach the machines the relationship

  7. 7:289:10

    Building Emotion, Expression, and Context

    1. HR

      between what you said and how you said it and the expression on your face and, like, how that was a reaction to what I had said, right? Like, all those things became es- you know, essential to building these AI humans.

    2. DH

      And I think a key thing is that this is only possible to be built now because for this to work, it needs the real low latency-

    3. HR

      Yes

    4. DH

      ... to have a fast response time. I mean, the human perception is more than, what is it, 10 milliseconds?

    5. HR

      Yeah. Yeah. At like, you know, an, a great response back and forth happens in, like, less than 200 milliseconds.

    6. DH

      So you guys have some new product launches that are coming up. Can you tell us more about it?

    7. HR

      I mean, yeah. So for the past couple of years we've been working on the foundational models to teach machines to see, hear, respond, even look like humans do. Um, and with this new product launch, we're actually, um, essentially bringing, like, AI humans to life for regular consumers and prosumers. And we really think it's, like, a transformative moment where, like, we feel like we've been in the command line era of AI, or just like in early computing where we went from these, like, command line computers to GUIs that allowed millions of people to use m- uh, machines. I think with what we're calling the Tavus PALs, it's going to be the same thing, where you'll have this AI human, um, that meets you where you are. It can video call you, it can text you, um, it can... You know, you can, you can, you can call it. It's proactive, it's multimodal, it's agentic, so it can go and do things for you, and it feels really, really natural because it has a high degree of emotional intelligence powered by these really amazing state-of-the-art perception models.

    8. DH

      That's pretty cool. This is a big evolution. You're going from serving very technical users with the SDK that need to be good software engineers to ship an AI human, now to someone who's not technical to be able to just launch it,

  8. 9:1011:00

    Use Cases From Startups to the Fortune 10

    1. DH

      and that's gonna unlock a lot more interactions. I mean, if you guys, if you guys succeed with this, you're gonna probably be doing at some point 100 billion-

    2. HR

      Yeah

    3. DH

      ... Tavus interactions, right?

    4. HR

      Yeah. Yeah.

    5. DH

      How will the world change when you get to... When you get there?

    6. HR

      Yeah, I mean, I think our team will cry happy and sad tears. [laughs] Um, but I think, I think what we're really excited about is solving the human computing problem, which if you solve, then essentially, like, using a computer becomes something that's like second nature. You don't have to learn how to do it. Uh, it just feels like talking to a friend or coworker. So you'll talk to your AI doctor or your AI therapist or your AI assistant sidekick. Everyone will have, like, Cortana and Jarvis, like, you know, like sci-fi dreamed of, in their hands. It'll understand you immensely and that's, like, a future we're really excited about.

    7. QF

      It's the start, right? It's the tip of the iceberg. These are the five first class citizens showing what AI humans can and, and should be, and then from there it will, will continue to expand where people can create their own and build on top of those.

    8. DH

      That's a very cool future where Tavus is going, and this is the other side of it where there might be a bit of, um, concerns from people-

    9. HR

      Mm-hmm

    10. DH

      ... in terms of alignment and a lot of these jobs that AI-

    11. HR

      Yeah

    12. DH

      ... are going to start taking. How do you guys think about that?

    13. HR

      I would say that, like, certainly some of that will happen, uh, I think at Tavus, like, we, we don't try to shy away from that and say, "Oh, we definitely, definitely won't be replacing jobs." But I think that the, the key goal is not to replace humans, but to replace bad machines that have been already put in place and are causing a regression. Like, telehealth already exists. You already don't get to talk to a front desk receptionist or a nurse, and it's just a worse experience for everyone involved. If you have an AI intake assistant that really understands you, it sees you, it sees how you're feeling, and it spends time with you in your language, like, that's a better experience. I also think that it's

  9. 11:0012:52

    Raising the $40M Series B

    1. HR

      a little bit of a privilege approach to be able to say, hey, like, if you had asked me, like, two years ago about AI therapy, I would've been like, "That's crazy. That's a bad idea." But the reality is, like, most people in the world can't afford therapy. They don't have access to it, and so the alternative isn't a human, it's nothing. Uh, and so if we can deliver a 80 to 90% good experience, it's not even replacing a human, it's putting this AI human somewhere where there was no alternative. Um, and that's something that we find to be really special.

    2. DH

      So how do you actually build these AI humans that have empathy?

    3. HR

      That's a good question. It's interesting because, like, human conversation is incredibly nuanced. Um, we like to say at Tavus that human conversation is an art, it's a dance. Like, this is a waltz that we're doing right now, and machines are in the corner doing the robot, and we're trying to do a waltz. And so to m- to bring machines, uh, to be able to do the waltz, the first thing is you have to give them the right signal and be able to collect the right data. And so that's why we spent some time on perception, being able to collect the most nuanced data on that eyebrow twitch you had or the slight smile, uh, to be able to collect that data and then to be able to actually form understanding around it. Um, and the understanding piece and the relationship piece is actually really important. So teaching them the relationship between the eyebr- the eyebrow twitch and what was said before that, like, what was that in response to? We spend a lot of time modeling those things, and essentially you can summarize what we're doing as creating human simulation models.And we're doing, we're simulating human conversations and reactions and expressions. And it's a lot of fun, and there's a- it's a very human thing to do, uh, which is, like, always a little tough for research teams is, like, there's like the research angle is, like, very, very human rooted.

    4. QF

      And a big part of what's important here, too, is how we bring it to the world. I think one of the lessons we learned really, really early on was we need an amazing demo that shows someone the magic, the experience.

    5. HR

      Yeah.

    6. QF

      Because we've, you know, adjusted to how

  10. 12:5215:18

    The Future: AI Humans as the Next Interface

    1. QF

      we talk to machines for so long, right? We type instead of talk, right? We have all of these lossy mechanisms for how we change information, and we're almost having to reteach humans how they can communicate with machines, how they can-

    2. HR

      Yeah

    3. QF

      ... actually talk naturally and normally. So it's not just the models, but it's actually creating the experience around it, where people are able to have this, you know, really refreshing, this new experience of, of talking to a machine.

    4. HR

      Yeah, 100%.

    5. DH

      What kind of advice would you have for founders that are just getting started?

    6. HR

      Have more conviction in, uh, in yourself and in the vision. Whenever you're a young founder, you can be more easily swayed [laughs] by, by, uh, by opinions and in, and feeling like you need to do, you know, you need to follow a certain path. And I think it took us a bit to figure out what we believed in is what we should be working on.

    7. DH

      In particular, was that crucible moment.

    8. HR

      Yeah.

    9. DH

      Because I remember that was a pretty big pivot for your company, and it took a bit of time for you to come into your own belief.

    10. HR

      Yeah.

    11. DH

      Because you had a bunch of other people telling you otherwise, right?

    12. HR

      Yes, absolutely.

    13. DH

      And it was a struggle.

    14. HR

      Yeah, it was. It, it felt like, it felt like you might let someone else down, and ultimately, like, this is a company that you're building, and you have to have full belief that the work that you're doing is a form of love. If you don't have that, then it's not gonna be successful no matter what.

    15. QF

      It, it's a craft. I, I think that was probably actually one of the most difficult times at Tavus, looking back at it-

    16. HR

      Yeah

    17. QF

      ... when we let those opinions influence us, right?

    18. HR

      Yeah.

    19. QF

      I think it impacted who we hired, what we were building, who we worked with. Like, it, it went throughout the business. It wasn't even just about the direction.

    20. HR

      Yeah.

    21. QF

      One of the learnings was definitely about not even believe in ourselves, but just have a deep conviction in what we're doing and let that flow everywhere throughout the business. But the other one is the only thing that matters is momentum.

    22. DH

      Hmm.

    23. QF

      Like [laughs] if, if things are not moving, then the business isn't moving. And, and it's in the small things, it's in the big things. But the only thing that matters is every day something needs to happen, right? And I think driving that through and pushing that through is, is one of the few things that has-

    24. HR

      Yeah

    25. QF

      ... kept things moving forward day over day.

    26. HR

      100%.

    27. DH

      I think that's a good way to end. I think we talked about in one of the videos recently that the first moat startups really only have is just speed.

    28. HR

      Yeah.

    29. DH

      And you guys done it.

    30. QF

      Our take on it is we are six months ahead, and we need to keep moving as, as fast as we can to keep that up.

Episode duration: 15:19

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