Voices
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Every agent speaks every language on bitHuman's built-in voice pipeline, included in the voice chat rate — or bring your own OpenAI, Grok, ElevenLabs, or Cartesia key for premium voices.
Two ways to give your agent a voice
| Option | What you get | Cost |
|---|---|---|
| bitHuman default | The built-in voice pipeline. Your agent detects the caller’s language and replies in it. No setup, no keys. | Included in the voice chat rate (pricing) |
| Bring your own provider | Connect your own OpenAI, Grok (xAI), ElevenLabs, or Cartesia key and pick that provider’s premium voices — including low-latency speech-to-speech (realtime). | The same voice chat rate, plus your provider’s charges on your key |
You never have to bring a key. The default pipeline already speaks every language. Bring your own only when you want a specific premium voice or a provider’s realtime engine.
Use the default (nothing to do)
Open any agent’s voice settings at bithuman.ai. The bitHuman voice section is marked Included — design a voice, clone one, or pick from the gallery. It’s multilingual automatically, so there’s no language toggle to manage.
Bring your own voice provider
1. Connect your key
Go to Developer → Integrations, add your provider, and paste that provider’s key; bitHuman checks the key there before saving and rejects an invalid one. The Providers API stores a key as sent, without a check, so start one session to confirm it works. Keys are encrypted at rest and never leave the platform in plaintext.
2. Pick a premium voice
Back in the agent’s voice settings, the premium providers you’ve connected unlock. Choose a voice; a provider you haven’t connected stays locked with a shortcut to Integrations. Your selection runs that voice on your key.
Supported providers
| Provider | Voices you can select | Realtime (speech-to-speech) |
|---|---|---|
| OpenAI | Realtime voices (alloy, ash, ballad, cedar, …) | ✓ |
| Grok (xAI) | Grok voices (ara, eve, rex, …) | ✓ |
| ElevenLabs | Your ElevenLabs voice library | — |
| Cartesia | Cartesia voices | — |
Tip Realtime providers (OpenAI, Grok) give the lowest-latency, most expressive speech-to-speech — great for kiosks and live demos. ElevenLabs and Cartesia give you a specific voice on the standard pipeline.
How billing works
- Every managed-agent conversation bills the voice chat rate, whichever voice it uses (pricing).
- A bring-your-own voice or realtime model is also billed by your provider on your key.
If a bring-your-own key ever fails or is removed, the agent automatically falls back to the built-in multilingual pipeline — it never silently stops talking.