{"id":290,"date":"2026-06-11T08:07:34","date_gmt":"2026-06-11T00:07:34","guid":{"rendered":"https:\/\/aidashxp.com\/claude-fable-5-review\/"},"modified":"2026-06-11T08:07:34","modified_gmt":"2026-06-11T00:07:34","slug":"claude-fable-5-review","status":"publish","type":"post","link":"https:\/\/aidashxp.com\/en\/claude-fable-5-review\/","title":{"rendered":"Claude Fable 5 in-depth review: The Mythos-level model is released for the first time, and the programming ability has improved qualitatively."},"content":{"rendered":"<p class=\"wp-block-paragraph\">June 9, 2026<strong>Anthropic<\/strong> Dropped a bombshell: Released <strong><a href=\"https:\/\/claude.ai\" target=\"_blank\" rel=\"nofollow noopener\">Claude<\/a> Fable 5<\/strong>\u2014\u2014This is Anthropic <strong>Mythos-class model is available to the public for the first time<\/strong>. <a href=\"https:\/\/claude.ai\" target=\"_blank\" rel=\"nofollow noopener\">Claude<\/a> Opus 4.8.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">core competencies<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fable 5 is based on the new Mythos architecture, which Anthropic calls \"the most powerful model ever trained\" in the system card.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Magenta Code Benchmark<\/strong>:Fable 5 score <strong>80%<\/strong>, about 6 times that of GPT-5.5, showing an overwhelming advantage in programming agent tasks<\/li>\n<li><strong>Comprehensive benchmark<\/strong>: More than an improvement over Opus 4.8 <strong>10%<\/strong>, reaching or approaching the state-of-the-art level in almost all testing areas<\/li>\n<li><strong>long range mission<\/strong>: Specially optimized for \"complex tasks where early models are easy to give up midway\", supporting ultra-long context windows (1M tokens)<\/li>\n<li><strong>Agentic capabilities<\/strong>: Amazing performance in complex agent tasks such as Pok\u00e9mon FireRed clearance and solar system simulation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In actual experience, Fable 5\u2019s performance in programming scenarios is indeed impressive.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pricing and availability<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The pricing of Fable 5 is positioned in the high-end market:<strong>$10\/million input token, $50\/million output token<\/strong>- About 60% more expensive than the Opus 4.8. <strong>Free use window until June 22<\/strong>, which allows users who want to try it out to experience it at zero cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is worth noting that Fable 5 introduces new <strong>30-day data retention requirement<\/strong>, which is different from Anthropic\u2019s usual privacy-friendly policy, and enterprise users need to pay attention to this change.<a href=\"https:\/\/claude.ai\" target=\"_blank\" rel=\"nofollow noopener\">Claude<\/a> Code and web use.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">User experience\/limitations<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>advantage<\/strong>: Qualitative improvement in programming ability, excellent long-term task stability, and excellent creative writing performance<\/li>\n<li><strong>shortcoming<\/strong>: Expensive ($50\/million output tokens), the security guardrails are too conservative (basic biological questions are also blocked), and the 30-day data retention policy may deter privacy-sensitive users.<\/li>\n<li><strong>Applicable scenarios<\/strong>: Complex programming projects, research-level knowledge work, long-form writing requiring in-depth reasoning<\/li>\n<li><strong>Not applicable scenarios<\/strong>: High-frequency low-cost calls, biology\/chemistry related research, and zero tolerance for data privacy scenarios<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Overall Score<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u7ef4\u5ea6<\/th><th>Score<\/th><th>evaluate<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>functional completeness<\/td><td>9.5 \/ 10<\/td><td>Comprehensive leadership in programming reasoning, complete multi-modal support<\/td><\/tr>\n<tr><td>\u6613\u7528\u6027<\/td><td>8.0 \/ 10<\/td><td>Safety guardrails are too aggressive in some scenarios<\/td><\/tr>\n<tr><td>Cost-effectiveness<\/td><td>7.0 \/ 10<\/td><td>The output cost is high, but Pro\/Max is free before June 22<\/td><\/tr>\n<tr><td>\u4e2d\u6587\u652f\u6301<\/td><td>8.5 \/ 10<\/td><td>Can understand Chinese fluently, but not as authentic as domestic models<\/td><\/tr>\n<tr><td>\u8f93\u51fa\u8d28\u91cf<\/td><td>9.5 \/ 10<\/td><td>Programming and reasoning quality reaches new heights<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Overall rating: 8.7\/10<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/claude.ai\" target=\"_blank\" rel=\"nofollow noopener\">Claude<\/a> Fable 5 is Anthropic\u2019s answer to the market on the eve of its IPO: it proves that Anthropic can not only be \u201csafe\u201d but also \u201cstrongest\u201d. <a href=\"https:\/\/aidashxp.com\/en\/\">AI Dash<\/a> \u2014\u2014Discover the best AI tools.<\/p>","protected":false},"excerpt":{"rendered":"<p>2026\u5e746\u67089\u65e5\uff0cAnthropic  [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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