# What Chirp Builder does

> Build your own AI chat helpers, called Chirps, from your instructions and files, and share them with a link.

Source: https://www.chirpbuilder.com/help/start-here/what-chirp-builder-does  
Plans: Everyone  
Last checked: 2026-10-26

Chirp Builder lets you build your own AI chat helpers, called **Chirps**, and share them with your
customers, students or team. It's made for people moving their Custom GPTs before OpenAI retires
them on December 11, 2026, and for anyone starting fresh.

![Garden Helper's public chat page. A visitor tapped "What can I plant in October?" and the Chirp answered with a short planting list.](https://mjmtbasmrtksluvlnema.supabase.co/storage/v1/object/public/help-media/web-optimized/start-here/what-chirp-builder-does/SS-START-001-01__visitor-chat__essentials__desktop__v01.webp?v=3828e0305e)

## What you can do

- **Build a Chirp** from a name, instructions and conversation starters, the same parts a Custom GPT
  has. [Your first Chirp in 10 minutes](https://www.chirpbuilder.com/help/start-here/first-chirp) walks you through it.
- **Teach it** with knowledge files such as PDFs, Word documents and spreadsheets, so it answers from
  your own material.
- **Choose its AI model** from Claude, GPT, Gemini and many others, and change it any time.
- **Share it.** Every Chirp gets its own chat page. Visitors don't need an account of any kind to
  chat, and you can also put the chat on your own website.
- **Move your Custom GPTs** with the help of Claude or ChatGPT. See
  [What MCP is, and moving GPTs with Claude or ChatGPT](https://www.chirpbuilder.com/help/start-here/what-is-mcp).

You, the owner, build and manage Chirps in your dashboard. **Visitors** are the people who chat with a
Chirp on its public page. They never see your dashboard, your instructions or your files.

## Who pays for what

Your Chirp Builder plan covers the software, hosting and publishing, with unlimited Chirps on every
plan. The AI's answers are paid for by your own **OpenRouter** account, a service that gives you one
key for hundreds of AI models. Chirp Builder adds no markup to the AI cost.
[What OpenRouter is, and who pays for what](https://www.chirpbuilder.com/help/openrouter/what-is-openrouter) explains how it works.

## Where to start

1. Have a Chirp Builder plan. Every plan includes unlimited Chirps; see [Pricing](/pricing).
2. Connect your OpenRouter key: [Connect your OpenRouter key](https://www.chirpbuilder.com/help/openrouter/connect-key).
3. Build your first Chirp: [Your first Chirp in 10 minutes](https://www.chirpbuilder.com/help/start-here/first-chirp).
4. Share its link, and watch the conversations come in under **Analytics**.