The Berkshire Archive

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Berkshire Hathaway · Ask

Askthe archive

Every letter from 1965 to 2024 and every meeting transcript from 1994 to 2025 is here as plain text that ChatGPT and Claude can read. Ask either one a question. It quotes Buffett’s own words, names the year, and links you to the page.

ChatGPTOpens a new chat with the prompt ClaudeOpens a new chat with the prompt

Try: What did Buffett write about the 1987 crash? · Why did Berkshire buy BNSF? · Explain page 206.

The prompt

Use the Berkshire Hathaway archive at https://berkshireletters.com/llms.txt. Fetch it first and follow its instructions. Answer my questions about Warren Buffett's shareholder letters and Berkshire's annual meetings with exact quotes, the year and section, and a link to the source.

Add the archive to Claude or ChatGPT

A chat app may refuse to open the archive’s links. Add the archive as a connector, once, and Claude or ChatGPT can search every letter and meeting and open any page of the book, every time.

Claude

  1. Open Claude’s connector settings.
  2. Choose Add, then Add custom connector. Name it Berkshire archive and paste the address below. It needs no sign-in.
  3. In a chat, turn it on under + → Connectors, and ask.

ChatGPT

  1. In ChatGPT, open Plugins, choose Add, then Create custom MCP server.
  2. Name it Berkshire archive and paste the address below. Set authentication to No authentication.
  3. Start a chat and ask.
The address

https://berkshireletters.com/mcp

Free Claude accounts can add one custom connector. ChatGPT needs Plus or above.

For your own tools: berkshireletters.com/llms.txt

About the archive · An Explorist Production · The Berkshire story For AI assistants: berkshireletters.com/llms.txt