• COST
  • LIMITS
  • SIZE
  • HUMAN

How to estimate API token costs with your AI

Connect Anthropic to your AI client to check your prompt size before you send it.

Ask AI about this page

Short answer

How can I predict my token usage before sending a prompt?

Your AI uses the count_tokens tool to calculate the exact number of tokens in your text. This lets you see if you're hitting context window limits or spending too much on a single request. You'll get a clear breakdown of the usage.

The outcomes

What you get from token estimation

Running this task helps you manage your budget and prompt length.

COST

Predictable spending

The AI calculates the token count for your specific input. You'll know the scale of the request before you pay for it.

LIMITS

Avoid truncated text

The AI checks your text against the context window. You'll know if your prompt is too large for the model to handle.

SIZE

Leaner prompts

Seeing the token density helps you trim unnecessary text. This keeps your requests efficient.

HUMAN

Manual edits

The AI provides the numbers, but you decide if the prompt needs shortening. You retain full control over the final text.

The workflow

What your AI does when you ask for a count.

The AI handles the math so you don't have to guess.

  1. Analyze input

    Your AI looks at the text or files you've provided in the chat.

    count_tokens

  2. Calculate tokens

    The agent runs the text through the counting tool to get a precise number.

    count_tokens

  3. Check limits

    The AI compares that number against the model's maximum context window.

    count_tokens

  4. Report results

    You get a clear summary of the token count and any potential issues.

    count_tokens

Try it

Copy these to start.

Use these prompts to begin estimating your usage.

Starting points

These are opening lines. Replace the bracketed text with your actual content.

Anthropic Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_olS3uDDLdOw9uiZoTqVqVIoK0UcivzobkVz8mrNA/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Anthropic capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "anthropic-alternative-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_olS3uDDLdOw9uiZoTqVqVIoK0UcivzobkVz8mrNA/mcp"
    }
  }
}
Copy into chat04

  • Count the tokens in this document: [paste text or file name]

  • How many tokens is this prompt using: [paste prompt]?

  • Check if this long text fits in the context window: [paste text]

  • Estimate the cost for a prompt with this many tokens: [number]

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Anthropic once, then ask.

Just click the link to connect your account. Your credentials stay encrypted, and you can start asking about token counts immediately.

Connect Anthropic to your AI

FAQ

How this task behaves

  • 01

    Does the AI automatically send my prompt to save money?

    No. The AI only counts the tokens. It won't send the actual prompt to the model unless you tell it to.

  • 02

    Can the AI change my prompt to make it shorter?

    No. The AI only reports the count. You have to be the one to edit the text if it's too long.

  • 03

    How accurate are these token counts?

    The counts are based on the specific tokenization used by the model you are targeting.

  • 04

    Can I use this to check my total monthly spend?

    No. This tool only looks at the specific text you provide in the current session.

  • 05

    Will this work with any AI client?

    Yes, it works with any MCP-compatible client like Claude, Cursor, or Windsurf.

  • More questions about Anthropic? The Connector page answers them. See everything the Anthropic Connector can do

Connect Anthropic to Claude, Cursor, ChatGPT & more