# pwasm 0.2a0 > Source: > Published: 2026-10-01 17:10:31+00:00 **Release:** [pwasm 0.2a0](https://github.com/simonw/pwasm/releases/tag/0.2a0) pwasm is one of my folly projects - an entirely vibe-coded pure Python WebAssembly engine that I built in January during my first bout of [AI mania](https://simonwillison.net/2026/Sep/27/2026-in-llms-so-far/#simon-willison-2026-in-llms.012.webp). I hadn't touched it since January, so I decided to let Claude Opus 5.5 loose on it and see if it could make any significant improvements: `Evaluate current state of pwasm - then consider what it would take to get the MicroPython and micro JavaScript experiments from the` [research repo](https://github.com/simonw/research) working under it - and what it would take to speed it up [42 commits later](https://github.com/simonw/pwasm/pull/12) (with minimal follow-up prompting) it now handles almost all of the WASM specification, and the wheel from PyPI bundles working WASM builds of [MicroPython](https://micropython.org/), [QuickJS](https://github.com/quickjs-ng/quickjs) and [Micro QuickJS](https://github.com/bellard/mquickjs). I wouldn't trust this thing at all - hence the alpha version tag - but it's interesting seeing how today's models can improve on the work of models from 10 months ago. Tags: [python](https://simonwillison.net/tags/python), [webassembly](https://simonwillison.net/tags/webassembly), [vibe-coding](https://simonwillison.net/tags/vibe-coding)