Youragent has a voice.Now give it a face.

Use a Cartesia Sonic voice in an Anam interactive avatar session. Keep the expressive speech layer, then add a synchronized face and live video without managing a separate Cartesia key in your app.

See it for yourself

Start a voice conversation, then flip the switch and watch how the avatar stays in sync without restarting the session or rebuilding your Cartesia agent.

Voice only Voice + Anam Reveal the face

Talk to the agent firstStart an audio-only conversation with your microphone.

cartesia-agent-demo · voice agent

KEEP EXPLORING

Build more with Anam + Cartesia

Docs Blog

Cartesia SonicText-to-speech

AnamLip sync · expression

Your appAudio + video

CARTESIA SONIC · SERVER-SIDE

From voice agent to video agent in a few lines.

Server-side integration reference. Use Coding Agents to adapt these snippets to your app or create a project.

Get API Key Read Integration Guide

// Server: use the Anam voice ID for a saved Cartesia voice
// Inside POST /api/anam-session; IDs and systemPrompt come from server config.
const response = await fetch("https://api.anam.ai/v1/auth/session-token", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.ANAM_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    personaConfig: {
      name: "Cartesia voice avatar",
      avatarId,
      voiceId,
      llmId,
      systemPrompt,
      voiceGenerationOptions: {
        speed: 1,
        volume: 1,
        emotion: "content",
      },
    },
  }),
});
if (!response.ok) throw new Error("Could not create Anam session");
const { sessionToken } = await response.json();
// Return { sessionToken } as JSON from your /api/anam-session route.

Add a face to your Cartesia agent.

Keep your current speech, language model, and voice stack. Add a synchronized avatar in a few lines.

Start building Read the guide