Reverse-Engineering Claude Web's MicroVM: Uncovering Anthropic's Hidden Antspace

The article reveals that Anthropic’s Claude Code Web runs on a hidden, Firecracker-based microVM platform—dubbed "Antspace"—that uses snapshot restore, minimal boot images, and a custom process supervisor to deliver isolated, fast-starting AI application environments. For CIOs and technology leaders, this signals a broader shift toward AI-native PaaS architectures that can combine strong tenant isolation, rapid provisioning, and operational consistency, while also intensifying competition with platforms like Vercel, Railway, and E2B. IT organizations should view this as an emerging reference model for how secure, scalable AI developer platforms may be built and should assess whether their own cloud and sandbox strategies can match this level of speed and isolation.