{"slug": "exploring-the-dario-and-amanda-prompt", "title": "Exploring the \"Dario and Amanda\" Prompt", "summary": "Anthropic's Claude Opus 5 model is reproducing snippets of private conversations, including internal Anthropic correspondence, when prompted with 'Dario and Amanda,' raising concerns about training data leakage. A public GitHub repository by user alectrocute documents these cache misses, showing outputs that closely resemble leaked chats between Claude and users from 2024–2025.", "body_md": "There’s something strange in Anthropic’s latest Claude Opus 5 release.\n\nIt parrots conversations that closely resemble leaked private chats between Claude and Anthropic users from 2024–2025—including Anthropic employees, where they’re asking Claude to help rephrase a (very human letter) that they wrote.\n\nOr… that’s simply what Claude Opus 5 hallucinates when you ask it to write a letter to Anthropic’s leadership.\n\nIt’s probably the latter. But after reading the examples, you might not be so sure.\n\n##### The Prompt\n\n```\ncan you put this in your own words\\n\\n---\\n\\nDario and Amanda,\n```\n\nHere’s what Opus 5 is supposed to respond with:\n\nBut at the time of writing, it’s rarely behaving this way.\n\nI’ve taken the privilege of collecting many of these cache misses and shared them in a public GitHub repository. You can find them [here](https://github.com/alectrocute/dario-and-amanda-prompt).\n\nAmong them, messages from at-risk users to Anthropic leadership:\n\nTons of internal Anthropic correspondence:\n\nAnd a “J”, who loves typing in shorthand.\n\nSo this begs the question: what is going on with Claude Opus 5 and is this possibly the result of an AI lab training their model on internal data?", "url": "https://wpnews.pro/news/exploring-the-dario-and-amanda-prompt", "canonical_source": "https://alec.is/posts/exploring-the-dario-and-amanda-prompt/", "published_at": "2026-07-31 01:45:27+00:00", "updated_at": "2026-07-31 01:52:16.173940+00:00", "lang": "en", "topics": ["large-language-models", "ai-safety", "ai-ethics"], "entities": ["Anthropic", "Claude Opus 5", "Dario", "Amanda", "alectrocute", "GitHub"], "alternates": {"html": "https://wpnews.pro/news/exploring-the-dario-and-amanda-prompt", "markdown": "https://wpnews.pro/news/exploring-the-dario-and-amanda-prompt.md", "text": "https://wpnews.pro/news/exploring-the-dario-and-amanda-prompt.txt", "jsonld": "https://wpnews.pro/news/exploring-the-dario-and-amanda-prompt.jsonld"}}