Nuance Labs Launches Emma, a Video Avatar That Listens and Talks Simultaneously, and Opens Nuplex Beta API
Seattle-based startup Nuance Labs introduces Emma, a conversational video persona built on its Nuplex 1.0 audiovisual model that reacts with facial cues while being spoken to. The web demo is free with no account required, in English only, alongside a beta API with strict restrictions: no cloning, no sexual content, and visible watermarks.
Most AI avatars wait politely until you finish speaking, frozen-faced, before generating a reply. Nuance Labs, a Seattle startup, is introducing Emma, a video persona designed to do the opposite: nod, squint, glance away, and occasionally interrupt while you are still talking. It runs on Nuplex 1.0, the audiovisual foundation model the company has been developing for 18 months, and can be tried for free in the browser without creating an account.
The Right Moment to Respond
Nuplex is a full-duplex model: it listens and speaks at the same time, rather than strictly taking turns. In its launch post, Nuance Labs explains that its goal is not the fastest possible response, but the most human one. Across 1,785 questions drawn from its own recordings of real-world conversations, the moment Nuplex begins speaking matches that of the original human speaker in 89% of cases, compared to 35% for the closest alternative system. The company notably compares its performance against open systems like Moshi as well as GPT-Live or Gemini Live, tested through their public APIs and thus factoring in network latency. It openly admits that current benchmarks in this space do not yet capture real-world experience.
A Persona, Not an Average Face
The other calculated bet is artistic. Emma’s face and voice are licensed from an actress who recorded her natural patterns of listening, reacting, and speaking. Rather than an “average” expression synthesized across thousands of faces, Emma reproduces the distinctive quirks of a specific person: a prolonged blink to emphasize a word, or eyes that drift off before snapping back. Her personality has also been crafted to avoid sycophancy: she holds opinions, will push back, and still transparently reminds users she is an AI.
The limitations are acknowledged upfront: English only, potential reasoning errors, ill-timed interruptions, sensitivity to background noise, still-fragile camera understanding, and lip-sync artifacts on poor network connections.
A Deliberately Constrained API
The Nuplex Beta API lets developers brief several personas via system prompts and have them delegate tasks to external tools during the conversation. Safeguards are stringent: cloning a real person or uploading a custom face or voice is impossible, video output features a visible watermark, prompts portraying the persona as a real human or genuine business are rejected, and sexual content or romantic “companionship” are strictly prohibited, alongside all healthcare and minor-focused applications. During calls, automated guardrails cut off the conversation if violence, hate speech, or sexual content occurs, or if the persona asks for an authentication code, credit card, or remote access. The service is accessible in the European Union, the United Kingdom, Canada outside Quebec, and the United States with the exception of four states. Pricing was not disclosed in the launch announcement.
Our take
In the avatar space, the race has so far centered on visual realism and lip-sync accuracy. Nuance Labs shifts the focus toward conversational cadence and non-verbal cues—arguably the real dividing line between a convincing persona and a talking video. The 89% benchmark comes from its own proprietary dataset and methodology, meaning independent evaluations will be needed. The highly restrictive usage policy is the real standout on the commercial front: at a time when avatars are increasingly leveraged for scams and digital companionship, it sets a clear point of comparison against competitors offering self-serve cloning.
Sources
- Nuance Labs — Meet Emma, the First Nuplex Persona (November 9, 2026) Primary source
- Nuance Labs — Emma (online demo) Primary source
- Nuance Labs — Nuplex Beta API platform Primary source
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