TL;DR Type
/radioin a session and Claude Code opens Claude FM, Anthropic's 24/7 lo-fi stream (made by musicians, not an algorithm) in your browser. It's background music for coding, and it only works inside a session.
Claude FM is a YouTube live stream Anthropic keeps running around the clock, in the study-lofi vein that Lofi Girl made famous. /radio doesn't play anything in the terminal: it opens https://clau.de/radio, which redirects to the stream, in your default browser. If you're on a remote box with no browser, it prints the URL for you to open yourself.
The best part is how they announced it: no blog post, no changelog, no press release. A single tweet with the word /radio and nothing else. A textbook easter egg.
The command
> /radio
⎿ Opening Claude FM in your browser…
1. Turn the radio on
/radio inside any interactive session. Claude FM opens in your browser and starts playing.
2. What's on
Lo-fi and ambient, mixed non-stop, with the artist and track named on screen. The stream has been live since June 12, 2026, it runs on the Claude channel, and the description says it plainly: "Made and curated by musicians," not an algorithm.
3. Where it does NOT work
- Interactive sessions only. In headless mode (
claude -p) it doesn't exist. - Not on Bedrock, Vertex, or Foundry.
- Still rolling out gradually, so it may not show up for you yet. The test is to type
/radioand see if it plays.
Reference
| Command | /radio |
| What it does | Opens Claude FM (clau.de/radio) in your browser |
| No browser | Prints the stream URL in the terminal |
| Where it works | Interactive session only |
| Where it doesn't | claude -p, Bedrock, Vertex, Foundry |
| The stream | 24/7 lo-fi on YouTube, curated by musicians |
Requirements
A recent Claude Code, in an interactive session. It's rolling out gradually, so don't worry if you don't have it yet.
Official docs: What's new, week 27 | Commands