Reverse engineering uncovers Anthropic's unreleased Vercel-like PaaS "Antspace" inside Claude Code Web
jedisct1 · x · 2026-09-14
Developer AprilNEA reverse engineered the Claude Code Web environment using only standard Linux tooling (strace, strings, objdump — no exploits) and uncovered unreleased Anthropic infrastructure:
- Firecracker MicroVM runtime: ACPI OEM ID "FIRECK" confirms the same MicroVM tech behind AWS Lambda/Fargate; 4 vCPUs (Xeon Cascade Lake), 16GB RAM, 252GB disk
- Hidden PaaS "Antspace": an entirely undocumented application hosting platform positioned like Vercel/Railway/E2B, described as an "AI-native PaaS"
- Unstripped Go binary: the Claude Code Web binary shipped with full debug symbols, enabling direct analysis
- Industry signal: nearly all new coding-agent platforms picked Firecracker for their web entry points
A rare first-hand look at the runtime architecture behind coding-agent platforms.
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