---
title: "Count Tokens"
method: POST
path: "/v1/messages/count_tokens"
tags: ["[beta] Anthropic Messages Token Counting"]
---

# Count Tokens

`POST /v1/messages/count_tokens`

## Request

- Base URL: `https://api.vibebrowser.app` (the document declares no server; this is the origin it was published from)
- URL: `https://api.vibebrowser.app/v1/messages/count_tokens`
- Auth: one of:
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`
  - API key in header `x-litellm-api-key`

Count tokens for Anthropic Messages API format.

This endpoint follows the Anthropic Messages API token counting specification.
It accepts the same parameters as the /v1/messages endpoint but returns
token counts instead of generating a response.

Example usage:
```
curl -X POST "http://localhost:4000/v1/messages/count_tokens?beta=true"       -H "Content-Type: application/json"       -H "Authorization: Bearer your-key"       -d '{
    "model": "claude-3-sonnet-20240229",
    "messages": [{"role": "user", "content": "Hello Claude!"}]
  }'
```

Returns: {"input_tokens": <number>}

## Response `200`

Successful Response

- unknown

---

[API](https://skmtc.dev/vibebrowser/apis/litellm-api.md) · [All operations](https://skmtc.dev/vibebrowser/apis/litellm-api/llms.txt) · [OpenAPI document](https://skmtc.dev/vibebrowser/apis/litellm-api/revisions/eea0b7e7b167?raw)