Anthropic released Claude Fable 5 on June 9, 2026 — the first Mythos-class model available to the general public. The launch marks a new capability ceiling for publicly accessible AI: Fable 5 ranks at or near the top across nearly all standard benchmarks for software engineering, vision, scientific reasoning, and autonomous task execution.
What Fable 5 can do
Fable 5 represents Anthropic's most capable public release to date. It exceeds prior Claude versions on multi-step coding tasks, achieves state-of-the-art performance on vision benchmarks, and handles long-horizon agentic workflows — including tasks that span multiple tools, APIs, and decision points without human checkpoints. Anthropic describes it as suited for "knowledge work at the frontier."
Claude Mythos 5 — restricted access
Alongside Fable 5, Anthropic launched Claude Mythos 5 — a model in the same capability tier but available only to approved organizations for government-adjacent cybersecurity use cases. Shortly after release, Mythos 5 was temporarily taken offline due to a U.S. government export directive, though Fable 5 remained available to all users.
Pricing and access
Through June 22, 2026, Fable 5 is available at no extra cost for users on Pro, Max, Team, and Enterprise plans. From June 23, access requires usage credits: $10 per million input tokens and $50 per million output tokens. The model is accessible via claude.ai and the Anthropic API.
Why it matters
The public release of a Mythos-class model narrows the gap between Anthropic's restricted frontier capabilities and what any paying user can access. For developers and enterprises building on Claude, Fable 5 sets a new baseline for production use — particularly in code generation, research automation, and multi-agent system orchestration.