Breaking

GPT-6 Astra and Claude Opus 5 Help Recover Two Long-Unsolved Enigma Messages

September 26, 2026 at 19:45 EDT

Foundation Models
AI Agents
Software Dev & Coding

Two long-unsolved German Army Enigma messages have been recovered in September 2026 with help from frontier AI models: OpenAI's GPT-6 Astra on MVUEH and Anthropic's Claude Opus 5 on FMNGI. The cases are drawing attention because the strongest claims are not just about plaintext, but about agents connecting archival clues, writing code, running searches and then submitting results for expert validation.

September 2026 - Enigma recovery

Two AI-assisted Enigma breaks

GPT-6 Astra and Claude Opus 5 helped recover two long-unsolved German Army messages, shifting attention from the plaintext alone to reproducible agent-assisted research.

letters in MVUEH body

13m 28s

FMNGI final key search

Enigma messages still unbroken

43,016

MVUEH search batches

Solved in September vs. still unbroken

The German Army Enigma list now has two recent AI-assisted recoveries beside seven entries still unsolved.

Recovered

Still unbroken

How the MVUEH workflow held together

Target

Pick MVUEH from unresolved traffic

→

Crib

Use ROSENOWROSENOW from related traffic

→

Search

Build simulator and Bombe-style tools

→

Check

Replay body and header independently

Why it matters

The models linked archives, cryptanalytic clues, custom code and verification into workflows humans could inspect.

What remains open

Full transcripts, costs, access paths and search assumptions still determine how far the autonomy claim should go.

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