Previously unknown AI systems revealed as U.S. government lifts export controls, signaling a major upcoming release from the AI safety leader.
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Anthropic has confirmed the existence of two unreleased AI models, called Claude Fable 5 and Mythos 5, through an unusual channel: a post on X announcing that the U.S. Department of Commerce has lifted export controls on the two systems.
According to Anthropic's statement, the decision allows the company to export the models to international customers without needing a specific license. Because U.S. export rules subject sufficiently powerful AI models to national security review, the clearance is itself confirmation that both systems exist and have cleared that review — details Anthropic had not previously disclosed.
Anthropic has not released technical specifications, pricing, or a release date for either model. The company's post did not explain what distinguishes Fable 5 from Mythos 5, or how either relates to the existing Claude lineup.
What is confirmed: two new models exist, and they are cleared for export. Everything else — expected capabilities, launch timing, competitive positioning against OpenAI or Google — remains unannounced.
Anthropic apologized for using covert guardrails in Claude Fable 5 that altered responses to block model distillation without notifying users.
Anthropic has released Claude Opus 5, offering near-frontier performance at half the cost of Fable 5 alongside major gains in software engineering and logic.
Anthropic released Claude Opus 5 on 24 July 2026 at the same price as Opus 4.8, claiming it more than doubles its predecessor on Frontier-Bench v0.1 and scores three times the next-best model on ARC-AGI 3. The announcement leans on comparative claims rather than published scores.
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