# cpython-wasm wheel

> **Popularity potential 62/100 — strong.**  
> Kind: `library` · Source: `web` · Fable confidence: 88% · Provenance: **Full prompts → project (multi-prompt session)**

Redistributable Python wheel bundling full CPython in WebAssembly — a problem Simon Willison struggled with for months, completed by Fable 5 in one documented multi-prompt session.

## Scorecard

| Dimension | Score |
| --- | --- |
| Originality | 4/5 |
| Usefulness | 4/5 |
| Execution | 4/5 |
| Momentum | 4/5 |
| Fable fit | 4/5 |
| Code quality | 5/5 |

## Fable-5 evidence

- Blog documents the full prompt sequence verbatim ('Clone simonw/micropython-wasm…', 'I want a wheel that has the whole system in it…'); 13.9 MB wheel resolves live.
- Confidence: **88%** (deep-fetch, source quoted live)

## LLM playbook — what another model would have needed

- Willison: 'something I'd struggled with for months' on prior models — the prior attempts failed where Fable 5 finished in minutes.

## Links

- Live: https://static.simonwillison.net/static/cors-allow/2026/cpython_wasm-0.1.0-py3-none-any.whl
- Source: https://simonwillison.net/2026/Jun/9/claude-fable-5/

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_Deep-fetch ingest · 2026-06-13T18:07:21.170Z · fable.directory_

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