--- title: Claude Fable 5 is generally available for GitHub Copilot description: Claude Fable 5, the first model in Anthropic's Mythos class, is now generally available in GitHub Copilot. It is designed for long-horizon, autonomous coding... canonical: https://daily.dev/posts/claude-fable-5-is-generally-available-for-github-copilot-3lvwwwr0t twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Claude Fable 5 is generally available for GitHub Copilot | daily.dev og:description: Claude Fable 5, the first model in Anthropic's Mythos class, is now generally available in GitHub Copilot. It is designed for long-horizon, autonomous coding... og:url: https://daily.dev/posts/claude-fable-5-is-generally-available-for-github-copilot-3lvwwwr0t og:image: https://api.daily.dev/og/posts/3LvWWwR0t.png og:image:alt: Claude Fable 5 is generally available for GitHub Copilot 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 is generally available for GitHub Copilot **[GitHub Changelog](https://daily.dev/sources/github_updates)** · 2 min read · 1 upvotes · 0 comments ## Summary Claude Fable 5, the first model in Anthropic's Mythos class, is now generally available in GitHub Copilot. It is designed for long-horizon, autonomous coding tasks and reportedly completes work with fewer tool calls and lower token consumption than previous Opus-tier models. Notably, it requires data retention — Anthropic retains prompts and outputs for up to 30 days to run safety classifiers, unlike other Claude models in Copilot which operate under Zero Data Retention. It is available to Copilot Pro+, Max, Business, and Enterprise users across VS Code, JetBrains, Xcode, Eclipse, and other surfaces. Enterprise and Business admins must explicitly enable the model in settings, as it is off by default. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#ai-coding](https://daily.dev/tags/ai-coding), [#anthropic](https://daily.dev/tags/anthropic), [#claude](https://daily.dev/tags/claude), [#github](https://daily.dev/tags/github), [#llm](https://daily.dev/tags/llm) [View this post on daily.dev](https://daily.dev/posts/claude-fable-5-is-generally-available-for-github-copilot-3lvwwwr0t) ```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 is generally available for GitHub Copilot","url":"https://daily.dev/posts/claude-fable-5-is-generally-available-for-github-copilot-3lvwwwr0t","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/claude-fable-5-is-generally-available-for-github-copilot-3lvwwwr0t"},"datePublished":"2026-06-09T17:53:27.477Z","dateModified":"2026-10-14T02:26:58.178Z","description":"Claude Fable 5, the first model in Anthropic's Mythos class, is now generally available in GitHub Copilot. 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