Simon Willison 1/10/2026

Fly's new Sprites.dev addresses both developer sandboxes and API sandboxes at the same time

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Fly.io's new product, Sprites.dev, provides stateful sandbox environments with checkpoint and restore capabilities. It addresses two key problems: creating safe development sandboxes for running AI coding agents (like Claude Code) in 'YOLO mode' without system risk, and offering a secure API sandbox for executing untrusted code. The service features persistent VMs with pre-installed tools, scale-to-zero billing, and aims to move beyond ephemeral containers.

Fly's new Sprites.dev addresses both developer sandboxes and API sandboxes at the same time

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