Full-Duplex Voice AI.
Talk. Listen. Simultaneously.
Seeduplex is ByteDance's breakthrough voice model — the first production-scale full-duplex speech AI. No more taking turns. Natural conversation, like a phone call with a person.
You
Speaking...
Seeduplex
Listening & Replying
Visualization of full-duplex interaction — live demo coming soon
Why Seeduplex is Different
Not a pipeline. Not a turn-based system. A native full-duplex model built from the ground up.
True Full-Duplex
Hear and speak simultaneously. The AI listens while talking — just like a human conversation.
Interference Resistant
50% fewer false triggers in noisy environments — navigation audio, background voices, ambient sound.
Dynamic Turn-Taking
250ms faster end-of-turn detection. The model knows the difference between a thinking pause and finishing a sentence.
End-to-End Native
Not a pipeline of ASR + LLM + TTS. One unified model — lower latency, higher coherence.
How Full-Duplex Works
Simultaneous Input
Seeduplex continuously streams audio input, extracting speech features in real-time — even while generating its own response.
Joint Acoustic + Semantic Inference
The model fuses acoustic signals with dialogue context to decide: keep listening, start replying, or handle an interruption.
Dynamic Turn Control
Using combined speech + semantic features, the model distinguishes a thinking pause from a conversation ending — 250ms faster than half-duplex.
Seeduplex vs The Competition
How does it stack up against GPT-4o Voice and Gemini Live?
| Feature | Seeduplex | GPT-4o Voice | Gemini Live |
|---|---|---|---|
| Full-duplex architecture | |||
| Native speech-semantic joint model | |||
| Interference suppression | partial | partial | |
| Dynamic turn-taking | |||
| Production scale deployment | |||
| Free access tier |
Learn About Seeduplex
All articlesApr 9, 2026
What is Seeduplex? ByteDance's Full-Duplex Voice AI Explained
A plain-English breakdown of how Seeduplex works and why full-duplex changes everything.
Apr 10, 2026
Seeduplex vs GPT-4o Voice: Which is More Natural?
Head-to-head comparison on latency, interruption handling, and real-world call quality.
Apr 10, 2026
How to Use Seeduplex Free — Full Access Guide 2026
Step-by-step guide to access Seeduplex via Doubao and the Seed API.