Comment by simonw

I'm really excited about https://sprites.dev/ - it hits two of my favourite problems at once:

1. Developer environment sandboxes. This is a cheap and convenient way to run Claude Code / Codex CLI / etc in YOLO mode in a persistent sandboxed VM with a restricted blast radius if something goes wrong.

2. Sandbox API. Fly now have a product that lets me make a simple JSON API call to run untrusted code in a new sandbox. There's even snapshotting support so I can roll back to a known state after running that code.

I wrote more a bunch more about this here: https://simonwillison.net/2026/Jan/9/sprites-dev/