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, deployed in collaboration with the US government. Mythos 5 is available to Project Glasswing cybersecurity partners, with an incoming trusted-access program for select biomedical researchers. On June 12, 2026, the US government applied export controls to both Fable 5 and Mythos 5, and Anthropic suspended access to both models for all users. The controls were lifted June 30, and both models were redeployed on July 1, 2026.
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.