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Teaching nanochat to count r's in strawberry

A full guide to adding a capability to a tiny LLM: synthetic tasks, tokenization traps, and why a honeybee-sized model needs the data over-represented.

by @karpathy
AIEngineering

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The bottleneck moved

@arpit_bhayani

Writing code used to be expensive, so process protected engineering time. Arpit Bhayani on what breaks when that assumption dies.

Aug 6, 2026

EngineeringAI