Astra and Opus just passed Turing’s other test
Cryptanalysts used OpenAI's GPT-6 Astra and Anthropic's Claude Opus 5 to crack two unsolved WWII Enigma messages.
Cryptanalysts report that OpenAI's GPT-6 Astra and Anthropic's Claude Opus 5 decoded two archival Enigma messages that had remained unsolved. Developer Carter Leffen prompted Astra to find and break a message unsolved since 2005; Frode Weirerud later validated the plaintext. On September 21, Jack Willis said Claude Opus 5 broke a different message after he supplied an officer's known signature as a crib. Weirerud says seven Enigma messages are still unbroken, plus one whose plaintext is known but whose settings are not.
- Carter Leffen used GPT-6 Astra to recover an Enigma message unsolved since 2005.
- Frode Weirerud of Crypto Cellar validated Astra's plaintext and called the result professional cryptanalysis.
- Jack Willis used Claude Opus 5 and an officer's known signature to break a second message.
- Seven unbroken Enigma messages remain, plus one with known plaintext but unknown settings.
- Products
- Enigma
- Organizations
- Bundesarchiv
- Countries
- GermanyUnited Kingdom
- AI models
- GPT-6 AstraClaude Opus 5
From the original article
2 min read at techcrunch.com
Frontier AI models are finishing Alan Turing's World War II codebreaking work.
By Tim Fernholz · techcrunch.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.