Anthropic's Claude Fable 5 Suspended Over U.S. Export Controls After June 2026 Launch

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Anthropic launched Claude Fable 5 in early June 2026, positioning it as its most advanced reasoning model built around a new Mythos-class architecture designed for autonomous coding and long-horizon agentic tasks. The model features a one million token context window and a 128,000 output token limit, enabling developers to generate entire application codebases in a single request. Shortly after release, U.S. authorities suspended public access to Fable 5 under an export control directive, citing its classification as a dual-use technology that could potentially be exploited for offensive cybersecurity operations. While Anthropic works toward compliance to restore access for verified enterprise users, Claude Opus 4.8 — released in late May 2026 — remains available and offers improved tool-calling, better judgment, and a fourfold reduction in coding errors compared to its predecessor.

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