{"slug": "show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms", "title": "Show HN: KillSwitch – a programming language designed to be difficult for LLMs", "summary": "A developer released KillSwitch, an esoteric programming language explicitly designed to be difficult for large language models and coding agents to parse or generate. The project ships with an interpreter, a specification, examples, and benchmarks, and its site displays a \"Sorry, only humans allowed\" message; the benchmarks page states \"Claude Opus 5 leads.", "body_md": "KillSwitch\nAn esoteric programming language built to break LLMs and coding agents.\npromo.ks\nRun\nSorry, only humans allowed\nStack\nstdout\nSource code\nExplore KillSwitch\nInterpreter, specification, and examples\nBenchmarks\nView the benchmarks\nClaude Opus 5 leads", "url": "https://wpnews.pro/news/show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms", "canonical_source": "https://killswitch-lang.org", "published_at": "2026-09-19 19:40:28+00:00", "updated_at": "2026-09-19 19:54:49.953949+00:00", "lang": "en", "topics": ["ai-agents", "large-language-models", "developer-tools"], "entities": ["KillSwitch", "Claude Opus 5"], "alternates": {"html": "https://wpnews.pro/news/show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms", "markdown": "https://wpnews.pro/news/show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms.md", "text": "https://wpnews.pro/news/show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms.txt", "jsonld": "https://wpnews.pro/news/show-hn-killswitch-a-programming-language-designed-to-be-difficult-for-llms.jsonld"}}