It blocked us at 'hello!' Anthropic Fable 5 refusing innocuous prompts
So it's unclear whether the actual false positive rate is greater or less than five percent. But with an estimated 18 to 30 million users worldwide, even a small percentage of thwarted users makes a racket. No repo content, no tool calls, and no file reads are in context when it fires."He is not the only frustrated customer.
- ▪So it's unclear whether the actual false positive rate is greater or less than five percent.
- ▪But with an estimated 18 to 30 million users worldwide, even a small percentage of thwarted users makes a racket.
- ▪No repo content, no tool calls, and no file reads are in context when it fires."He is not the only frustrated customer.
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| Original publisher | theregister |
| Canonical URL | https://www.theregister.com/ai-and-ml/2026/06/10/anthropic-claude-fable-5-refuses-innocuous-prompts/5253754 |
| Publication time | Wed, 10 Jun 2026 22:20:38 +0200 |
| Retrieval time | 2026-06-11T00:50:07.633Z |
| Last seen | 2026-06-11T00:50:15.308Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 9CYj_QBpqSL3 |
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| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
(function() { let windowUrl = window.location.href; windowUrl = windowUrl.substring(windowUrl.indexOf('?') + 1); let messageElement = document.querySelector('.shareableMessage'); if (windowUrl && windowUrl.includes('code') && windowUrl.includes('expires')) { messageElement.style.display = 'block'; } })(); AI AND ML It blocked us at 'hello!' Anthropic Fable 5 refusing innocuous prompts Hyper-vigilant safety classifiers turn Fable into cautionary tale Thomas Claburn Thomas Claburn Senior reporter Published wed 10 Jun 2026 // 21:20 UTC Anthropic's newly released Claude Fable 5 generative AI model is trying so hard to be safe that it's hurting its own userbase.
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