Anthropic released Claude Fable 5 on June 9, its first Mythos-class model made publicly available, offering a 1-million-token context window, 128,000-token maximum output, and pricing of $10 per million input tokens and $50 per million output tokens (TechCrunch, Anthropic). Anthropic reports the model scores 80.3% on SWE-bench Pro, compared to 69.2% for Claude Opus 4.8, 58.6% for GPT-5.5, and 54.2% for Gemini 3.1 Pro, and 95% on SWE-bench Verified (MangoMind Blog). From June 9 through June 22, Fable 5 is included at no extra charge for Pro, Max, Team, and Enterprise subscribers; usage credits are required starting June 23 (Anthropic). Alongside Fable 5, Anthropic introduced Claude Mythos 5, the same underlying model with certain safety restrictions lifted, available only to a limited group of cyberdefenders and infrastructure providers through Project Glasswing (CNBC). Fable 5 itself includes safety guardrails blocking high-risk categories including offensive cybersecurity, biology, chemistry, and model distillation; queries flagged by the classifiers route to Claude Opus 4.8 as a fallback, with Anthropic reporting that 95% of sessions run entirely on Fable 5 (IT Pro, The Hacker News).
GitHub Copilot added Fable 5 as a generally available model on June 9 for Copilot Pro+, Max, Business, and Enterprise subscribers across VS Code, Visual Studio, JetBrains, Xcode, Eclipse, the Copilot CLI, and github.com (GitHub Changelog); because Anthropic’s safety classifiers must inspect outputs, the integration requires administrators to explicitly enable the Fable 5 policy in Copilot settings (the policy is off by default) and allows Anthropic to retain prompts and completions for up to 30 days (Coursiv). Also on June 9, Google reduced the Google AI Plus subscription price from $7.99 to $4.99 per month, a 37.5% cut, while doubling included storage from 200 gigabytes to 400 gigabytes; the plan includes access to Gemini 3.5 Flash, Gemini Omni Flash for video generation, Google Flow, and NotebookLM (TechCrunch, Digital Trends).