jessicata: Coding AI Took 2 Days for a Simple Eval Harness, No Real Speedup

jessi_cata · x · 2026-11-15

AI safety researcher jessicata pushes back on claims that coding AI replaces programmer units, with a firsthand datapoint: building a seemingly simple eval harness to spec with Astra + Codex (Sol 6.1) took her 2 days, mostly waiting on models — she could have coded it herself in similar time. She suspects Anthropic employees are extreme power users inflating their perceived uplift, and cites studies (e.g. Jellyfish) showing low software-engineering gains. David Manheim counters that 3+ orders of magnitude cheaper matters regardless; jessicata proposes a testable crux: fully automatically writing large informally specified applications.

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