Vibe-coded port of a language itself cuts typechecking time 3x with Opus
maxleiter · x · 2026-10-13
Theo credits Claude Opus 5.5 for a "slop port" of the LANGUAGE ITSELF — vibe coded with a test suite as the safety net — achieving a 3x reduction in typechecking time. Max Leiter quote-tweets with an LLM-flavored Archimedes line: "Give me an LLM that's good enough and a test suite on which to place it, and I shall move the world."
A notable example of vibe coding with tests as the correctness guardrail, letting the model rewrite core tooling for real performance gains.
Related event: Dev Vibe-Codes Programming Language Port with LLM, 3x Faster Type Checking(2 posts)→
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