Observed Signal · Sep 26, 2026 · Technical Release · Source: t3n · Impact: 3/5 · Sentiment: Positive
GPT-6 Astra Cracks WWI ADFGVX Cipher and WWII Enigma
A developer named 'Prinz' claims OpenAI's GPT-6 Astra AI model has decrypted a German military radio message from November 1918, which had been encrypted using the ADFGVX cipher and previously considered unreadable. The model reportedly solved it by trying the keyword 'Truppenverschiebung', which was previously thought to be used only from December 1918. The decrypted message reports the arrival of an English cruiser at Sevastopol, which was cross-referenced with historical logs. However, the scientific community has not yet independently verified this solution. Additionally, another developer, Carter Leffen, used GPT-6 Astra to decrypt a German Enigma message from July 1941. With a known crib, the model took ten hours and 14.8 million key checks, and this solution has been independently confirmed by the Cryptocellar archive.
The article highlights a practical application of OpenAI's new GPT-6 Astra model in cryptanalysis, demonstrating advanced AI reasoning capabilities that could have implications for AI-driven automation and problem-solving in data-intensive fields, although not directly related to adtech.
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Key Takeaways & Evidence Grounding
- OpenAI's GPT-6 Astra model decrypted a WWI ADFGVX-encrypted German radio message from November 1918.
- The model reportedly used the keyword 'Truppenverschiebung' to decrypt the message.
- A second developer, Carter Leffen, used GPT-6 Astra to solve an Enigma message from July 1941.
- GPT-6 Astra took 10 hours and checked 14.8 million keys for the Enigma decryption.
- The Enigma solution was independently confirmed by the Cryptocellar archive.
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AI Models Crack Unsolved Enigma Messages
Two cryptanalysts used AI models from OpenAI and Anthropic to crack two long-unsolved Enigma machine messages that had resisted decryption for years. Carter Leffen employed OpenAI's GPT-6 Astra to analyze a database of Enigma messages, conducting archival research, building a simulator, and recovering the plaintext of a message unsolved since 2005. Frode Weirerud, who maintains the Crypto Cellar website, validated Leffen's solution. Another cryptanalyst, Jack Willis, used Anthropic's Claude Opus 5 to break a different message. Weirerud noted that only seven unbroken Enigma messages remain, and AI's success in this domain demonstrates its growing capabilities in complex research and problem-solving tasks, which could have implications for automated analysis and data processing in various industries.
OpenAI Releases GPT-6 Astra with Critical Cybersecurity Capabilities
OpenAI has unveiled GPT-6 Astra, its most powerful and broadly deployed AI model, designed for agentic workflows that autonomously operate browsers, websites, and desktop applications. Astra can research, fill forms, update enterprise software, and create documents and dashboards, transitioning from AI assistant to AI executor. Under the Preparedness Framework, Astra is the first model to reach 'Critical' cybersecurity capability, enabling zero-day exploits, prompting expert scrutiny. It shows improved alignment (half as many high-severity misaligned flags), better jailbreak resistance, and respects boundaries, but faces decreased monitorability due to potential reasoning obfuscation. Benchmarks show significant gains over GPT-5.6 Sol (e.g., 72.6% vs 65.7% on OSWorld 2.0). OpenAI has deployed misalignment monitoring and may slow development speed. Rollout starts with selected organizations, then via API and ChatGPT tiers.
OpenAI begins rolling out GPT-6 Astra model
OpenAI's GPT-6 Astra, launched on September 4, 2026, advances toward AGI, scoring top on benchmarks but facing scrutiny. It ties Claude Fable 5.1 at 53 points on the Artificial Analysis Intelligence Index v4.3, leads new Terminal-Bench 4.0 and AutomationBench-AA, and matches Claude on the Coding Agent Index at less than half the cost. However, independent ARC-AGI-3 scores vary widely (17%-63% stateless vs. 99.9% with adapter), and Claude still leads in some reasoning tasks. Safety concerns persist due to reduced monitorability. NVIDIA CEO Jensen Huang declared 'AGI has arrived,' though disputed; Anthropic leads enterprise coding (54% vs. OpenAI's 21%). Astra now surpasses the human baseline on SimpleBench. OpenAI reports over one billion weekly active users, 2.5 million businesses, and plans to deploy its Jalapeño chip by year-end. The model is available in ChatGPT Work, Codex, and the API, priced at $10 per million input tokens and $50 per million output tokens. It reduces unintended outcomes by 89% and is the first to reach OpenAI's 'Critical cybersecurity capability threshold.' New enterprise plugins for Oracle Analytics, Power BI, Navan, and Avalara were launched.
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