--- title: Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed,... description: Claude Fable 5, Anthropic's most capable public AI model, was pulled offline within days of launch after the US government issued an export-control directive... canonical: https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline | daily.dev og:description: Claude Fable 5, Anthropic's most capable public AI model, was pulled offline within days of launch after the US government issued an export-control directive... og:url: https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au og:image: https://api.daily.dev/og/posts/abk4v41aU.png og:image:alt: Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline **[XDA Developers](https://daily.dev/sources/xda-developers)** · 8 min read · 0 upvotes · 0 comments ## Summary Claude Fable 5, Anthropic's most capable public AI model, was pulled offline within days of launch after the US government issued an export-control directive citing a jailbreak vulnerability. The author had originally planned a conflicted recommendation: Fable 5 outperformed GPT-5.5 and Claude Opus 4.8 on real-world coding tasks — including finding a subtle cluster-invalidation bug in a 90,000-line SQLite codebase that other models missed — and posted strong benchmark scores (80.3% on SWE-Bench Pro, 13.4% on FrontierCode Diamond). However, the model launched with significant baggage: Anthropic silently downgraded requests it deemed sensitive (later reversed after public backlash), imposed mandatory 30-day data retention that overrode existing Zero Data Retention agreements (prompting Microsoft to restrict internal use), and was priced at $10/$50 per million input/output tokens. The government's stated rationale — that Fable 5 could be jailbroken to surface security vulnerabilities — has not been publicly substantiated, leaving the situation unresolved. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#llm](https://daily.dev/tags/llm), [#claude](https://daily.dev/tags/claude), [#ai-coding](https://daily.dev/tags/ai-coding), [#code-review](https://daily.dev/tags/code-review), [#ai-regulation](https://daily.dev/tags/ai-regulation) [View this post on daily.dev](https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline","url":"https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au"},"datePublished":"2026-06-13T10:02:28.877Z","dateModified":"2026-06-17T15:51:59.437Z","description":"Claude Fable 5, Anthropic's most capable public AI model, was pulled offline within days of launch after the US government issued an export-control directive...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8bbdd1c363e1402e527fd8ac11194449?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8bbdd1c363e1402e527fd8ac11194449?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"XDA Developers","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"XDA Developers","logo":"https://media.daily.dev/image/upload/s--kCg6yyAP--/f_auto,q_auto/v1774964407/logos/xda-developers?_a=BAMAMiWQ0","url":"https://daily.dev/sources/xda-developers"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/claude-fable-5-caught-bugs-gpt-5-5-and-opus-4-8-missed-then-the-us-government-forced-it-offline-abk4v41au","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"llm,claude,ai-coding,code-review,ai-regulation","timeRequired":"PT8M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"XDA Developers","item":"https://daily.dev/sources/xda-developers"},{"@type":"ListItem","position":3,"name":"Claude Fable 5 caught bugs GPT-5.5 and Opus 4.8 missed, then the US government forced it offline"}]} ```