Can I get the AI to slow down if the user requested it?

Yes, you can slow down the AI's speech if the user requests it, provided you are using a supported provider like Cartesia. To do this, set the

speed

property in your voice configuration to a slower value, such as

'slow'

or a numeric value (e.g.,

-0.5

):

json
"voice": {
  "provider": "cartesia",
  "speed": "slow" // or use a value like -0.5 for more control
}

Update this property in your assistant's configuration when the user asks to slow down the speech. Note: This feature is only available for certain providers like Cartesia and PlayHT. [See documentation](https://docs.vapi.ai/changelog/2025/4/5) Sources: - [Vapi Changelog April 5, 2025](https://docs.vapi.ai/changelog/2025/4/5) - [Vapi Cartesia Voice Provider Documentation](https://docs.vapi.ai/providers/voice/cartesia) - [Vapi Speech Configuration](https://docs.vapi.ai/customization/speech-configuration)

Set the speed parameter like, "speed": 0.8..