mitsuhiko claims an Opus 5.5 agent could re-implement CPython in two weeks, no human input
mitsuhiko · x · 2026-11-01
mitsuhiko argues a coding agent like Opus 5.5 could re-implement all of CPython within two weeks with no human input, working only against the tests — achieving full compatibility including ABI, plus no-GIL and a JIT, likely beating the original on every measurable metric. His follow-up advice: study the JVM rather than CPython for design decisions.
Related event: mitsuhiko: coding agents could rewrite CPython in two weeks without humans(2 posts)→
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