Why Anthropic's Fable Fails as a Useful Model for Computer Science Research

Fable is not a useful model

I tested Anthropic's Fable on complex software tasks, only to find it useless for research. The model's safety classifier aggressively rejected legitimate prompts about rewriting code in Rust and analyzing biological networks, often refusing to explain why. After export controls briefly halted access, Fable returned with stricter safeguards but remained unable to handle nuanced technical work, proving it is not a viable tool for serious Computer Science applications.

"The 'classifier' used by Fable is not so much a classifier as, perhaps, a simple rejection list of terms and users, refusing to even begin to engage with subjects who have any relation to biological research."