Neural Network Reverse Engineering Puzzle: From Weight Matrix to Hash Function

Neural Network Reverse Engineering: When Machine Learning Becomes a Puzzle Game

Jane Street released a special ML puzzle: given the complete neural network weights, find an input that makes it output non-zero. This isn’t a typical black-box attack - it requires truly understanding what the network is computing. A college student spent days, going from linear programming to SAT solvers, and finally discovered the network was hiding an MD5 hash function.

February 28, 2026 · 9 min · 1772 words · Monster Beast Programming
Claude Code Implementing Z80 Emulator: antirez's Clean Room Programming Experiment

The Redis Author Had AI Write an Emulator, 30 Minutes to Run Through All Z80 Instructions

Redis founder antirez used Claude Code to implement a complete Z80 emulator in 30 minutes, passing the ZEXALL full instruction test. He designed a strict clean-room experiment: first had AI organize documentation, then cut off the network and implemented from scratch. Result: 1200 lines of code, zero bugs, and顺便 also built ZX Spectrum and CP/M environments.

February 28, 2026 · 9 min · 1732 words · Monster Programming
RAG Retrieval-Augmented Generation: turning AI from closed-book to open-book

RAG in Practice: Stop Making Your LLM Take Closed-Book Exams

A practical RAG tutorial: build an enterprise knowledge base Q&A system in 4 steps using embedding vector search and Claude. Contextual Retrieval cuts retrieval failure from 5.7% to 1.9%, with full Python code and Voyage AI model comparison.

February 10, 2026 · 10 min · 2050 words · Dream Beast Programming
Codex CLI 0.86.0 Version Update

Codex CLI 0.86.0 Update: Skill Config, Web Search, Sandbox Elevation & More

OpenAI Codex CLI, this terminal tool, received major version updates from 0.80.0 to 0.86.0, including SKILL.toml skill config, web search control, sandbox elevation, and headless login. Let’s see how to make the most of AI programming.

January 16, 2026 · 6 min · 1178 words · Rexai Programming
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