# LemonSlice

> LemonSlice is a San Francisco AI research and product lab that turns a single photo into a real-time, talking video avatar - the visual face for voice agents and chatbots. Its Lemon Slice-2 model is a purpose-built, large-scale video diffusion transformer that generates every pixel from scratch to produce expressive, full-emotion talking characters (human or cartoon) that livestream at conversational speed. Founded in 2024 by three PhD-creators (formerly Infinity AI), the company raised a $10.5M seed led by Matrix Partners and Y Combinator to make all video interactive.

- **Founded:** 2024
- **Headquarters:** San Francisco, United States
- **Founders:** Lina Colucci (Co-founder & CEO), Sidney Primas (Co-founder), Andrew Weitz (Co-founder)
- **Team size:** ~8-11 employees
- **Products:** Lemon Slice-2, Real-time interactive avatars, Avatar API & embeddable widget, AI talking-head video generation (legacy, formerly Infinity AI)
- **Notable:** Raised $10.5M seed (Dec 2025) led by Matrix Partners and Y Combinator, with backing from a Dropbox co-founder, a Twitch co-founder and The Chainsmokers., Built Lemon Slice-2, a ~20B-parameter video diffusion transformer in the same class as Sora and Veo3 but specialized for talking humans and real-time use., Achieved real-time avatar streaming (~20 fps) on a single GPU from a single input image.

## Products & services

- **Lemon Slice-2** — A proprietary large-scale video diffusion transformer (~20 billion parameters) specialized for talking humans and optimized for real-time performance. It generates every pixel from scratch, enabling full-emotion facial animation, hand gestures, and expressive whole-body movement from a single image.
- **Real-time interactive avatars** — Turns a single photo into a real-time video call - like FaceTime with an AI. Avatars livestream at ~20 fps on a single GPU, work for photorealistic humans and cartoon/non-human characters, and can access external knowledge bases so responses stay contextually accurate.
- **Avatar API & embeddable widget** — Developers add a talking video face to voice agents and chatbots via an API or a single line of embed code, with customizable backgrounds, styling and appearance. Voice is powered by ElevenLabs; built-in content moderation guards against unauthorized face/voice cloning.
- **AI talking-head video generation (legacy, formerly Infinity AI)** — Create AI talking-head videos from a photo and script - the earlier product line from when the company operated as Infinity AI, including creator and video tools.

## Achievements

- Raised $10.5M seed (Dec 2025) led by Matrix Partners and Y Combinator, with backing from a Dropbox co-founder, a Twitch co-founder and The Chainsmokers.
- Built Lemon Slice-2, a ~20B-parameter video diffusion transformer in the same class as Sora and Veo3 but specialized for talking humans and real-time use.
- Achieved real-time avatar streaming (~20 fps) on a single GPU from a single input image.
- Y Combinator Winter 2024 batch company; rebranded from Infinity AI to LemonSlice.

## Latest updates

- **2025-12** — Emerged from stealth with $10.5M seed funding and publicly unveiled real-time interactive avatars powered by the Lemon Slice-2 model.
- **2025-12** — TechCrunch reported the raise from YC and Matrix to build out the digital-avatar technology; company team size around 8.
- **2024** — Founded and joined Y Combinator's Winter 2024 batch; rebranded from Infinity AI to LemonSlice.

## Links

- Website: https://lemonslice.com
- LinkedIn: https://www.linkedin.com/company/lemonslice
- Twitter/X: https://twitter.com/LemonSliceAI
- YouTube: https://www.youtube.com/channel/UCcpOAt8ePJrfrYS5tADQXqw

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Profile page: https://yespress.io/lemonslice
Published by YesPress — https://yespress.io
Last updated: 2026-08-04