Anthropic's Secret PaaS 'Antspace' Found Hidden in Claude Code's Unstripped Binary
Reverse-Engineering Claude Web's MicroVM: Uncovering Anthropic's Hidden Antspace
A casual strace inside a Claude Code session revealed a Firecracker MicroVM with an unstripped Go binary. Digging deeper uncovered Antspace, an undocumented deployment platform built from scratch, plus Baku, the web app builder behind claude.ai. The binary exposes a full internal PaaS with Vercel-like deployment, Supabase provisioning, and snapshot-based session restores.
A search for 'Antspace' across the entire public internet turned up nothing: Anthropic's website, GitHub, blog, documentation, LinkedIn, job postings, conference talks, patent filings. Zero results.
- simonw
One thing that I didn't understand from this article was how you use this deployment platform.
Can you tell Claude code for web to build and deploy a web app using it? If so, does that end up with a public URL somewhere? Does that deployment continue working after your Claude code for web session ends?
- gabrielsroka
Actual title: '
Anthropic's Hidden Vercel Competitor "Antspace"'
It's for Claude Code, not Claude web. And it's been posted here 3 times already.
- simonw
"No systemd. No sshd. No cron. No logging daemon."
You can delete that sentence. Why would someone assume sshd or cron in an environment like this?
Omit needless words.