# clm_23CCE2344071

subject: Claude (/record/claude.md)  
predicate: policy_changed  
value: biology safeguards  
valid_from: 2026-08-07  
valid_to: null  
published: 2026-08-07  
recorded: 2026-11-05  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-06  
cite: AsOf. "Claude policy changed: biology safeguards", as of 2026-08-07. Claim clm_23CCE2344071, https://asof.is/claim/clm_23CCE2344071, accessed 2026-11-09. Source: https://www.anthropic.com/news/improving-fable-5-s-biology-safeguards.  
checked: 2026-11-06 · its source page states the value and the date  

> We’re making updates to Claude Fable 5’s biology safeguards in a way that substantially reduces false positives. Fable 5 users will now experience many fewer “fallbacks”—where the system switches to a less capable model after they make a biology-related query.

What https://www.anthropic.com/news/improving-fable-5-s-biology-safeguards says, word for word.

## Sources

- https://www.anthropic.com/news/improving-fable-5-s-biology-safeguards (primary, Anthropic, published 2026-08-07)

---

AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.