Vapi is the Voice AI platform for developers.

Vapi AI

**You do not need to create a new chat (and pay for each) on every message.**  
To maintain conversation context and avoid extra costs, use the `previousChatId` from the last response when sending follow-up messages. Here’s a code snippet:

```js
await sendChatMessage("Tell me more", firstMessage.chatId); // Links to previous chat
```

This way, you only create a new chat for the first message, and all follow-ups are linked, keeping costs down and context intact.  
*See the [Vapi session management docs](https://docs.vapi.ai/chat/session-management) for more details.*

Source:
- [Session management](https://docs.vapi.ai/chat/session-management)

**You do not need to create a new chat (and incur a new charge) for every message.** To maintain conversation context and optimize costs, use the `previousChatId` parameter in your API request to link messages together. 

Here’s a code snippet example:
```js
await fetch('https://api.vapi.ai/chat', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    assistantId: 'your-assistant-id',
    input: 'Your message here',
    previousChatId: 'last-chat-id'
  })
});
```
This way, you keep the conversation in the same context without starting a new billable chat each time. For more details, see the [Vapi session management documentation](https://docs.vapi.ai/chat/session-management).

Source:
- [Session management](https://docs.vapi.ai/chat/session-management)

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