Anthropic has launched Claude Fable 5, its first Mythos-class model for general use. The company says Fable 5 is its most capable broadly available Claude model yet, with stronger performance in software engineering, knowledge work, vision, scientific research, and longer complex tasks.
The release matters because Anthropic previously kept Mythos-class capabilities behind tighter access. Fable 5 is the public version, while Claude Mythos 5 is being offered to a smaller group of trusted cyberdefenders and infrastructure providers.
For Apple users, the direct link is still limited. Anthropic says Mythos 5 will initially roll out through Project Glasswing, but this announcement does not put Fable 5 inside Apple Intelligence. It does, however, arrive as Apple is reportedly exploring broader third-party AI model choices for Apple Intelligence, including Claude.
Fable 5 gets public access, but with guardrails
Anthropic says Fable 5 uses safeguards that can route some requests to Claude Opus 4.8 instead of answering with Fable 5. Those safeguards cover areas such as cybersecurity, biology and chemistry, and distillation attempts.
The company says the fallback should trigger in less than 5% of sessions on average. Users will be told when a request is handled by Opus 4.8.
That is the tradeoff Anthropic is making here: it is opening up a more capable model, but only with stricter controls around areas where misuse could cause real damage.
Mythos 5 stays restricted
Claude Mythos 5 uses the same underlying model as Fable 5, but Anthropic says some safeguards are lifted for trusted users. It will initially be deployed through Project Glasswing, in collaboration with the U.S. government, as an upgrade to Claude Mythos Preview.
Anthropic says Mythos 5 has its strongest cybersecurity capabilities and plans to expand access through a broader trusted-access program. It also plans a separate biology trusted-access program for select researchers and life sciences organizations.
That split makes the product strategy clearer. Fable 5 is for general users. Mythos 5 is for controlled access where Anthropic believes the extra capability can help defenders and researchers without giving the same freedom to everyone.
Paid-plan access changes after June 22
Claude Fable 5 is available now through the Claude API and consumption-based Enterprise plans. Developers can use it as claude-fable-5.
For subscriptions, Anthropic is including Fable 5 on Pro, Max, Team, and seat-based Enterprise plans from June 9 through June 22, 2026. On June 23, the model will be removed from those plans and will require usage credits, unless Anthropic extends the included window.
Pricing for both Fable 5 and Mythos 5 is $10 per million input tokens and $50 per million output tokens.
The timing is also worth watching for developers. A model that is stronger at long-running coding and agentic tasks adds more pressure to the same platform questions Apple is already facing around AI agent apps on the App Store. More capable models make these apps easier to build, but they also make review, safety, and user control harder to define.
For now, the headline is simple: Anthropic is bringing Mythos-class AI to public Claude users for the first time, but it is doing so with safeguards, usage limits, and a clear separation between public Fable access and restricted Mythos access.
