I built a programming language that LLMs can't use

What happened

Dominik Picheta created an esoteric programming language called KillSwitch that is designed to be hard for large language models (LLMs) and coding agents to understand. The language uses hidden lies, letter counting rules, and safety‑triggering phrases to confuse models. It is stack‑based with limited constructs like functions, variables, and if statements, and most of the script is ignored by the interpreter. Picheta benchmarked major LLMs and coding agents on tasks in KillSwitch, finding that Claude’s Opus 5 performed best, while models like Gemini 4 Argon struggled due to safety guardrails. The best open‑weight model scored 66.8 on the leaderboard.