{"id":6340,"date":"2026-09-01T22:38:23","date_gmt":"2026-09-01T22:38:23","guid":{"rendered":"https:\/\/silvybrand.com\/?p=6340"},"modified":"2026-09-01T22:38:23","modified_gmt":"2026-09-01T22:38:23","slug":"anthropic-claude-fable-mythos-5-1","status":"publish","type":"post","link":"https:\/\/silvybrand.com\/?p=6340","title":{"rendered":"Anthropic launches Claude Fable 5.1 and says it\u2019s up to 45 percent cheaper for agentic work"},"content":{"rendered":"<p><br \/>\n<\/p>\n<div>\n<p class=\"duet--article--dangerously-set-cms-markup duet--article--standard-paragraph _1044qizi _18mzr4b1 _18mzr4b0 _19wv7tc1\">Anthropic says its newest AI models, <a href=\"https:\/\/www.anthropic.com\/claude-fable-and-mythos-5-1\">Fable 5.1 and Mythos 5.1<\/a>, address criticisms from customers about price, data retention, and overzealous safeguards. The company claims <a href=\"https:\/\/platform.claude.com\/docs\/en\/models\/fable-5-1\/whats-new-fable-5-1\">Claude Fable 5.1<\/a> offers stronger performance than Fable 5, but costs around 25 percent less typically and up to 45 percent less for complex agentic tasks, thanks to reduced pricing on cached data that was already processed and stored.<\/p>\n<\/div>\n<div>\n<p class=\"duet--article--dangerously-set-cms-markup duet--article--standard-paragraph _1044qizi _18mzr4b1 _18mzr4b0 _19wv7tc1\">Along with the announcement, a slew of early impressions popped up, including from Every CEO Dan Shipper, <a href=\"https:\/\/x.com\/danshipper\/status\/2094848951568474186\">who claims<\/a>, \u201cIt\u2019s the strongest coding model we\u2019ve used, but now it\u2019s fast, token-efficient, and crucially actually speaks like a normal person.\u201d<\/p>\n<\/div>\n<div>\n<p class=\"duet--article--dangerously-set-cms-markup duet--article--standard-paragraph _1044qizi _18mzr4b1 _18mzr4b0 _19wv7tc1\">Box CEO Aaron Levie <a href=\"https:\/\/x.com\/levie\/status\/2094851976769257770\">is another early access believer<\/a>, saying that his company\u2019s agent with Fable 5.1 picked up on subtleties and ambiguities in data that Fable 5 missed in the same test. Meanwhile, Lisan al Gaib <a href=\"https:\/\/x.com\/scaling01\/status\/2094850290855936277\">points out<\/a> that on benchmarks, Mythos 5.1 with low reasoning scores the same as its predecessor set to Max reasoning.<\/p>\n<\/div>\n<div>\n<p class=\"duet--article--dangerously-set-cms-markup duet--article--standard-paragraph _1044qizi _18mzr4b1 _18mzr4b0 _19wv7tc1\">Fable 5.1 also has \u201cmore precise safeguards\u201d that Anthropic says are less likely to <a href=\"https:\/\/www.theverge.com\/ai-artificial-intelligence\/947973\/fable-wont-answer-basic-biology-questions\">block basic biology questions<\/a> than Fable 5, but Mythos 5.1 has the same biology restrictions as the previous model. Anthropic also explained its progress on data retention, saying that <a href=\"https:\/\/www.anthropic.com\/news\/enterprise-frontier-safeguards\">Enterprise Frontier Safeguards<\/a> offer \u201ccomplete privacy\u201d by storing data on the customer\u2019s cloud servers instead of its own, and will start rolling out later this fall.<\/p>\n<\/div>\n<div>\n<p class=\"duet--article--dangerously-set-cms-markup duet--article--standard-paragraph _1044qizi _18mzr4b1 _18mzr4b0 _19wv7tc1\">Anthropic says it\u2019s \u201cnow allowing Fable 5.1 to be used for identifying software vulnerabilities,\u201d but it will still redirect some cybersecurity tasks to Opus models, like \u201cpenetration testing, exploit generation, and binary-based vulnerability scanning.\u201d Claude Fable 5.1 is now available on all platforms, while Mythos 5.1 is available to Project Glasswing participants only.<\/p>\n<\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/www.theverge.com\/ai-artificial-intelligence\/987830\/anthropic-claude-fable-mythos-5-1\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anthropic says its newest AI models, Fable 5.1 and Mythos 5.1, address criticisms from customers about price, data retention, and overzealous safeguards. The company claims Claude Fable 5.1 offers stronger performance than Fable 5, but costs around 25 percent less typically and up to 45 percent less for complex agentic tasks, thanks to reduced pricing [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4378,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[31,175,46],"class_list":["post-6340","post","type-post","status-publish","format-standard","has-post-thumbnail","category-gadgets","tag-ai","tag-anthropic","tag-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Anthropic launches Claude Fable 5.1 and says it\u2019s up to 45 percent cheaper for agentic work - Silvybrand Lifestyle Blog<\/title>\n<meta name=\"description\" content=\"Anthropic has released Claude Fable 5.1 and Mythos 5.1 models with price reductions on cached data and more precise safeguards that produce fewer false positives.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/silvybrand.com\/?p=6340\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Anthropic launches Claude Fable 5.1 and says it\u2019s up to 45 percent cheaper for agentic work - 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