Doctor frustrated by Fable 5 medical usage restrictions for revision apps
A doctor reports that Anthropic's Fable 5 (and Opus) models refuse to generate medical content even for personal revision, citing medical usage terms. The user seeks workarounds to build study apps without violating policies.
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Users report Fable AI refuses to generate scripts involving police
A user reports that Fable, an AI scriptwriting tool, now refuses to generate any script involving police, even for neutral documentaries. The user seeks workarounds and questions whether this is a permanent policy shift.
Users discuss Fable 5 guardrails and weekly cap confusion with Opus 4.8 fallback
Anthropic extended Fable 5 promotional access and higher Claude Code weekly limits through July 19. Users report that Fable 5's safety guardrails block legitimate research like biological neuron simulations, and that the weekly cap and Opus 4.8 fallback are two separate routing systems, causing confusion.
Claude app user receives unrelated security advisory in response to simple prompt
A Reddit user reported that typing a simple prompt into the Claude app on iPad (Fable 5) resulted in a detailed, coherent writeup about a security product called 'Zenith Gateway'—including CVEs, patches, and affected versions—instead of the expected answer. The user suspects the model received someone else's input by mistake, as the response was fully structured with reasoning steps, not a random hallucination. This incident raises concerns about input integrity in AI chat interfaces.
User reports Sonnet 5 bug causing prompt contamination and shares workaround
A user published an article detailing failure modes of Anthropic's Sonnet 5 model and an instruction layer to mitigate them. They also provide a temporary fix for a bug where user preferences/project instructions bleed into each prompt, contaminating the interaction loop. The user believes this bug is responsible for much of the initial negative feedback about Sonnet 5.
Users report overly strict safeguards flagging benign content
Users are reporting that AI safety filters are flagging benign content, indicating overly restrictive safeguards. This has led to frustration among developers and researchers who find the filters hinder legitimate use cases.
