Andrej Karpathy on Engineering

Andrej Karpathy@karpathy

And an example of some of the summary metrics produced by the $100 speedrun in the report card to start. The current code base is a bit over 8000 lines, but I tried to keep them clean and well-commented. Now comes the fun part - of tuning and hillclimbing.

872 likes23 repliesPosted Oct 13, 2025

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Why it worked

Uses concrete numbers instead of vague claims, which makes it credible and quotable.
Ends on a short line that is easy to quote and repeat.
Written from experience rather than as advice, which is harder to argue with.
Short enough to read in full without expanding, which removes a step before the point lands.
Short sentences keep the pace up, so the reader never has to re-read a line.

The mechanics

Hook: Plain observation
Structure: Hook → Landing
Style: Conversational paragraphs at a steady pace.
Tone: personal
Mechanisms: Specificity
Written for: Engineers and technical teams

Analysis by ViralLoop — not written by the original author.

Topics

Engineering

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