One brain, three surfaces
Vex is not just a chat feature. The same AI model and knowledge sources power three separate surfaces in Yaplet:
- Widget chat: Vex auto-replies to visitors in the live chat widget.
- Inbox AI assist: Vex helps your agents draft, summarize, and rephrase messages — but doesn't auto-reply to visitors here. Agents are still in control.
- AI voice agent: Vex answers phone calls, speaks in real time, and hands off to a human agent when needed.
The knowledge sources, system prompt, and persona you configure for Vex in the chat context also inform the voice agent — you're not maintaining two separate AI setups.
What's different about voice
While the knowledge and persona are shared, voice has its own configuration layer:
- Voice and language selection: Pick from 30+ voices and 17 languages. Voice has a narrower language set than text chat (100+ languages) because spoken TTS/STT models are more limited than text LLMs.
- Phone number setup: Each AI voice agent is tied to a phone number you purchase through Yaplet.
- Call recordings and transcripts: Every call lands in the inbox as a transcript and optional recording — the same inbox where chat conversations live.
- Per-minute billing: Voice uses Yaplet credits at approximately $0.12 per minute, separate from AI chat usage.
Set up the voice surface
Everything about setting up, configuring, and billing for AI phone calls is covered in the AI phone category. Start with AI phone — how it works in the AI phone section.
Next step
Not ready for voice yet? Check Vex usage and credits to understand how chat AI usage is metered.