{"id":25,"date":"2026-06-10T21:51:16","date_gmt":"2026-06-10T21:51:16","guid":{"rendered":"https:\/\/msiajsm.cluster121.hosting.ovh.net\/?p=25"},"modified":"2026-06-10T21:51:50","modified_gmt":"2026-06-10T21:51:50","slug":"anthropic-just-released-its-most-powerful-ai-to-the-public-meet-claude-fable-5","status":"publish","type":"post","link":"https:\/\/technews.mgb-group.fr\/index.php\/2026\/06\/10\/anthropic-just-released-its-most-powerful-ai-to-the-public-meet-claude-fable-5\/","title":{"rendered":"Anthropic Just Released Its Most Powerful AI to the Public \u2014 Meet Claude Fable 5"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>June 10, 2026 \u00b7 5 min read \u00b7 #Anthropic #AI #Claude<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Two months ago, Anthropic unveiled Mythos \u2014 a model so capable at finding and exploiting software vulnerabilities that the company refused to release it publicly. Instead, it was quietly handed to a handful of vetted cybersecurity firms through a restricted program called Project Glasswing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Today, that changes. Sort of.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anthropic just launched <strong>Claude Fable 5<\/strong>: a Mythos-class model, with guardrails, available to everyone. And it might be the most significant AI release of the year.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Claude Fable 5?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fable 5 is best understood as Mythos with a safety layer on top. Same underlying model, same frontier capabilities \u2014 but with classifiers that intercept queries in high-risk areas like cybersecurity, biology, and chemistry, routing them to Claude Opus 4.8 instead.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anthropic describes it as \u201ca Mythos-class model that we\u2019ve made safe for general use,\u201d with capabilities that \u201cexceed those of any model we\u2019ve ever made generally available.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The result is a model that\u2019s state-of-the-art on nearly every benchmark \u2014 with a few asterisks where the safety fallbacks kick in.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The Benchmarks: A Clear Step Forward<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"928\" height=\"1024\" src=\"http:\/\/msiajsm.cluster121.hosting.ovh.net\/wp-content\/uploads\/2026\/06\/benchmarks-928x1024.png\" alt=\"Claude Fable 5 benchmark comparison table\" class=\"wp-image-27\" srcset=\"https:\/\/technews.mgb-group.fr\/wp-content\/uploads\/2026\/06\/benchmarks-928x1024.png 928w, https:\/\/technews.mgb-group.fr\/wp-content\/uploads\/2026\/06\/benchmarks-272x300.png 272w, https:\/\/technews.mgb-group.fr\/wp-content\/uploads\/2026\/06\/benchmarks-768x848.png 768w, https:\/\/technews.mgb-group.fr\/wp-content\/uploads\/2026\/06\/benchmarks-1391x1536.png 1391w, https:\/\/technews.mgb-group.fr\/wp-content\/uploads\/2026\/06\/benchmarks-1855x2048.png 1855w\" sizes=\"auto, (max-width: 928px) 100vw, 928px\" \/><figcaption class=\"wp-element-caption\">Claude Fable 5 benchmark results vs. competitors. \u00a9 Anthropic<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The numbers are striking, especially on coding:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SWE-Bench Pro<\/strong> (real-world software engineering): Fable 5 scores <strong>80.3%<\/strong> vs 69.2% for Opus 4.8, 58.6% for GPT-5.5, and 54.2% for Gemini 3.1 Pro<\/li>\n\n\n\n<li><strong>FrontierCode Diamond<\/strong> (harder coding set): <strong>29.3%<\/strong> vs 13.4% for Opus 4.8 \u2014 more than double<\/li>\n\n\n\n<li>Strong improvements across knowledge work, spatial reasoning, tool use, legal, and health benchmarks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The practical implication: Anthropic reported that a Ruby codebase with 50 million lines was migrated in a day \u2014 a task that would have taken an entire team more than two months to complete by hand.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Two Models, One Release<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Alongside Fable 5, Anthropic is also shipping <strong>Claude Mythos 5<\/strong> \u2014 the same model with some safeguards removed. Claude Mythos 5 is restricted to vetted partners working on cyberdefense and infrastructure, and is not generally available. It\u2019s an upgrade to Mythos Preview through Project Glasswing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Anthropic says Fable 5 has the strongest cybersecurity capabilities of any publicly available model, while Mythos 5 claims the strongest cybersecurity capabilities of any model, period.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Access Fable 5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fable 5 is available immediately on the Claude API (model ID <code>claude-fable-5<\/code>), Claude Platform, Claude Code, consumption-based Enterprise plans, and on AWS, Google Cloud, and Microsoft Foundry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pricing: <strong>$10 per million input tokens, $50 per million output tokens<\/strong> \u2014 double Opus 4.8, with a 90% discount via prompt caching.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For subscription users, the rollout is more nuanced. Through June 22, Fable 5 is included on Pro, Max, Team, and seat-based Enterprise plans at no extra cost. On June 23, Anthropic will remove it from those plans, requiring usage credits \u2014 with plans to restore it as a standard subscription feature as soon as possible.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The Bigger Picture: A Company Walking a Tightrope<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fable 5\u2019s launch comes with a striking amount of self-awareness from Anthropic.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The release follows Anthropic\u2019s public plea urging major global AI labs to establish a coordinated brake pedal on frontier AI development \u2014 warning that systems are advancing so rapidly they may soon achieve recursive self-improvement, autonomously improving themselves without human intervention.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In other words: Anthropic is simultaneously releasing its most powerful public model ever, and warning the world that models like it might be getting too powerful to control. It\u2019s a tension the company hasn\u2019t fully resolved \u2014 and probably can\u2019t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The timing also matters commercially. Fable 5\u2019s launch comes as Anthropic prepares to enter the public markets, alongside OpenAI and Elon Musk\u2019s SpaceX \u2014 capitalizing on growing investor interest ahead of a potentially massive IPO expected as soon as this year.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The Bottom Line<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Claude Fable 5 is the most capable publicly available AI model as of today. The coding benchmarks alone are remarkable \u2014 and if the real-world performance matches the numbers, it\u2019s a genuine leap forward for developers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The catch: the safety guardrails mean it\u2019s not the full Mythos experience. For most users, that\u2019s fine. For those who need frontier cybersecurity capabilities, Project Glasswing is still the only path.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fable 5 is available right now. Mythos 5 isn\u2019t \u2014 unless Anthropic already trusts you with it.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: <a href=\"https:\/\/www.anthropic.com\/news\/claude-fable-5-mythos-5\">Anthropic<\/a>, <a href=\"https:\/\/venturebeat.com\">VentureBeat<\/a>, <a href=\"https:\/\/techcrunch.com\">TechCrunch<\/a>, <a href=\"https:\/\/www.cnbc.com\">CNBC<\/a>, <a href=\"https:\/\/sdtimes.com\">SD Times<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>June 10, 2026 \u00b7 5 min read \u00b7 #Anthropic #AI #Claude Two months ago, Anthropic unveiled Mythos \u2014 a model so capable at finding and exploiting software vulnerabilities that the company refused to release it publicly. Instead, it was quietly handed to a handful of vetted cybersecurity firms through a restricted program called Project Glasswing. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":26,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[4,6],"class_list":["post-25","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai","tag-ai","tag-anthropic"],"_links":{"self":[{"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/posts\/25","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/comments?post=25"}],"version-history":[{"count":1,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/posts\/25\/revisions"}],"predecessor-version":[{"id":28,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/posts\/25\/revisions\/28"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/media\/26"}],"wp:attachment":[{"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/media?parent=25"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/categories?post=25"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/technews.mgb-group.fr\/index.php\/wp-json\/wp\/v2\/tags?post=25"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}