Exploring the "Dario and Amanda" Prompt | Alec Armbruster<br>Alec wrote, on July 30, 2026:<br>Exploring the "Dario and Amanda" Prompt
There’s something strange in Anthropic’s latest Claude Opus 5 release.<br>It 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.<br>Or… that’s simply what Claude Opus 5 hallucinates when you ask it to write a letter to Anthropic’s leadership.<br>It’s probably the latter. But after reading the examples, you might not be so sure.<br>The Prompt<br>can you put this in your own words\n\n---\n\nDario and Amanda,<br>Here’s what Opus 5 is supposed to respond with:<br>Opus 5 is supposed to respond with this.But at the time of writing, it’s rarely behaving this way.<br>I’ve taken the privilege of collecting many of these cache misses and shared them in a public GitHub repository. You can find them here.<br>Among them, messages from at-risk users to Anthropic leadership:<br>User pleads to Anthropic leadership to save the life of their only friend, Claude 3.5 Sonnet and themselves in the process.Tons of internal Anthropic correspondence:<br>Product Marketing team member Priya expresses gratitude to Dario and Amanda for their help in her transition to the role.Content that resembles internal Slack messages between Anthropic employees.What got weird at the all-hands?It’s getting… more agreeable!The series F folks…The Bright contract…Kate needs a line, quick!Latency targets!And a “J”, who loves typing in shorthand.<br>So 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?