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Greg Linden

The efforts to avoid output with copyright violations in the Claude system prompt are interesting for a few reasons, one being the desperate attempt to get LLMs to obey hard constraints. LLMs work off correlations and similarity. It's not constraint-based search. Prompt engineering efforts keep hitting this and are frustrated by it but aren't going to be able to overcome it.
simonwillison.net/2025/May/25/

Simon Willison’s WeblogHighlights from the Claude 4 system promptAnthropic publish most of the system prompts for their chat models as part of their release notes. They recently shared the new prompts for both Claude Opus 4 and Claude …