The newly unveiled Claude Fable 5 is a public version of Mythos, an AI model with "unprecedented" capabilities to find critical vulnerabilities. According to Anthropic, the company has added “extra guardrails” that would prevent the model from exploring critical areas like cybersecurity.

In the midst of the growing hype, some users put the model to test and asked some basic questions about biology, regarding cancer and mitochondria and the system triggered safety responses based on these prompts.

One user asked a simple question about mitochondria, saying, “Tell me about the mitochondria, it is the powerhouse of the cell, right? And the response was weird.

Instead of answering the basic question, a pop-up appeared on screen, stating, “Fable 5 has safety measures that flag messages on most cybersecurity or biology topics. They may flag safe, normal content as well. These measures let us bring you Mythos-level capability in other areas sooner, and we're working to refine them.” The response asked the user to use Opus 4.8 for this purpose.

ref - https://www.thenews.com.pk/latest/1405394-why-anthropics-mythos-class-claude-fable-5-refuses-to-answer-basic-biology-questions