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pwasm 0.2a0

Blog · Watch/Read · (gathered 2026-10-05)

  • Simon Willison released pwasm 0.2a0, a pure Python WebAssembly engine, describing it as a “folly project” initially “vibe-coded” during an “AI mania” phase.
  • The project saw significant improvement, handling “almost all of the WASM specification” and bundling working WASM builds of MicroPython, QuickJS, and Micro QuickJS, after Simon “let Claude Opus 5.5 loose on it,” leading to 42 commits with minimal follow-up prompting.
  • Willison explicitly warns that he “wouldn’t trust this thing at all” (hence the alpha tag), but finds it “interesting seeing how today’s models can improve on the work of models from 10 months ago.”