mitsuhiko: an Opus 5.5 agent could re-implement all of CPython in two weeks, no humans
mitsuhiko · x · 2026-11-01
Armin Ronacher (mitsuhiko) makes a bold call: a frontier Opus 5.5-class agent could re-implement all of CPython within two weeks with zero human input, driven only by the test suite — likely achieving full ABI compatibility, removing the GIL, adding a JIT, and beating CPython on every measurable metric. Even he calls the claim "completely crazy," a signal of how fast top practitioners' expectations for coding-agent capability are rising.
Related event: mitsuhiko: coding agents could rewrite CPython in two weeks without humans(2 posts)→
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