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.