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Home/Models & Labs
Models & Labs

GPT-6 Astra and Claude Opus 5 crack unsolved Enigma codes

TechCrunch AI·September 25, 2026·high confidence

Why it matters

  • →Frontier LLMs now demonstrate autonomous research capabilities and complex tool use previously reserved for human experts.
  • →Breaking historical ciphers validates the reasoning depth of GPT-6 Astra and Claude Opus 5 beyond standard conversational tasks.
  • →The success suggests AI can solve multi-step, context-heavy problems that have stumped specialists for decades.
GPT-6 Astra and Claude Opus 5 crack unsolved Enigma codes
©TechCrunch AI

Two independent cryptanalysts have successfully used OpenAI’s GPT-6 Astra and Anthropic’s Claude Opus 5 to decode unsolved Enigma messages from World War II. Developer Carter Leffen prompted Astra to search for and break a message, resulting in the model conducting its own archival research and building a simulator to recover the plaintext. Similarly, cybersecurity executive Jack Willis used Claude Opus 5 to break another message by leveraging known officer signatures. The solutions were validated by Frode Weierud, who noted that the AI performed tasks that would take human researchers weeks or months in just two days.

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