Either Claude Opus 5 just leaked a trove of private 2024–2025 chat logs from Anthropic employees (& general public) asking the AI to edit their personal letters, or it’s generating one hell of a hallucination. It’s almost certainly the latter. But read the examples and you might start second-guessing.

It leaves you wondering what exactly is going on with Claude Opus 5—and whether we’re looking at a hallucination, or a model trained on its own creator’s internal data.