# Lab

Write-ups with measured numbers.

Numbers taken from records rather than recollection, and a black box taken apart on screen. Every input is shown, so a figure is something to check rather than to trust.

- [Mini GPT](https://alegauss.github.io/products/mini-gpt/) — Java · Teaching project. A character-level GPT written from scratch in plain Java with no ML library at all — bigrams, then backprop by hand, then a small transformer.
- [Usage Simulator](https://alegauss.github.io/products/claude-code-usage/) — Web · Cost model. What a Claude Code task really costs, and how far each plan carries you — every coefficient measured from real session transcripts.
- [Time Study](https://alegauss.github.io/products/claude-code-time-study/) — Report · Time analysis. Where the hours actually went on an AI-assisted project, attributed from session records and git history rather than recalled.