--- title: Anthropic's open-weights silence after its own Fable 5 ban description: Anthropic is the only major AI lab that has not signed the 'Open Weights and American AI Leadership' letter, drawing sharp criticism from investors and... canonical: https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Anthropic's open-weights silence after its own Fable 5 ban | daily.dev og:description: Anthropic is the only major AI lab that has not signed the 'Open Weights and American AI Leadership' letter, drawing sharp criticism from investors and... og:url: https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag og:image: https://api.daily.dev/og/posts/de2rehvAg.png og:image:alt: Anthropic's open-weights silence after its own Fable 5 ban 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. # Anthropic's open-weights silence after its own Fable 5 ban **[The Next Web](https://daily.dev/sources/tnw)** · 5 min read · 0 upvotes · 0 comments ## Summary Anthropic is the only major AI lab that has not signed the 'Open Weights and American AI Leadership' letter, drawing sharp criticism from investors and industry figures who see the holdout as commercially motivated. The piece contextualizes the silence against Anthropic's own June experience: the US government ordered it to shut down Fable 5 and Mythos 5 worldwide after export controls barred foreign nationals from accessing them. Anthropic argued at the time that restrictions punish defenders without removing capabilities from adversaries — the same logic the open-weights letter now makes. The article also notes that Chinese model GLM-5.2 launched the day after Fable 5 went dark, cited the ban as proof American models are unreliable, and later performed forensic work on the Hugging Face breach when US closed tools declined. Anthropic's position — that frontier model weights should remain with a small number of accountable labs — is internally consistent but also commercially convenient, given White House accusations that Moonshot distilled its Fable model to build Kimi K3. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Anthropic rejects open-weight AI bans, calls for China chip controls and safety tests](https://daily.dev/posts/anthropic-rejects-open-weight-ai-bans-calls-for-china-chip-controls-and-safety-tests-plwlbpjht) · InfoWorld · 0 upvotes · 0 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#anthropic](https://daily.dev/tags/anthropic), [#ai-governance](https://daily.dev/tags/ai-governance), [#ai-regulation](https://daily.dev/tags/ai-regulation) [View this post on daily.dev](https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag) ```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":"Anthropic's open-weights silence after its own Fable 5 ban","url":"https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag"},"datePublished":"2026-07-27T14:56:38.484Z","dateModified":"2026-07-27T15:12:56.945Z","description":"Anthropic is the only major AI lab that has not signed the 'Open Weights and American AI Leadership' letter, drawing sharp criticism from investors and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/3fd918137cfe2426bb1ebf548f9daa6c?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/3fd918137cfe2426bb1ebf548f9daa6c?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"The Next Web","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":"The Next Web","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/tnw","url":"https://daily.dev/sources/tnw"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/anthropic-s-open-weights-silence-after-its-own-fable-5-ban-de2rehvag","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"llm,anthropic,ai-governance,ai-regulation","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Next Web","item":"https://daily.dev/sources/tnw"},{"@type":"ListItem","position":3,"name":"Anthropic's open-weights silence after its own Fable 5 ban"}]} ```