Summary & Key Takeaways ​

The Claude Opus 5 system prompt details how the model should address its past suspension. Claude Fable 5 and Mythos 5 were suspended due to U.S. export controls in June 2026. The prompt ensures Claude confirms these events accurately and factually. Claude is instructed to avoid personal opinions and refer to Anthropic's statement. The model checks for newer information when it can search.

Our Commentary ​

It's fascinating to see the explicit instructions given to these models. This isn't just about preventing "hallucinations"; it's about managing corporate messaging and compliance directly within the model's operational parameters. It makes me wonder what other directives are baked into these system prompts.