Rewriting campfire in Jai: developer finally feels "models are amazing when tasks have perfect verification"

lucasmeijer · x · 2026-10-17

lucasmeijer shares hands-on experience: using models to rewrite a campfire effect in Jai was the first time he truly felt in his bones that "if your task has perfect verification, models are amazing." Previously he found models useful but not great at new "I'll-know-it-when-I-see-it" work — echoing his earlier point about the ocean of difference between large work with a reference implementation and designing something new.

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