A pair of cryptanalysts says OpenAI’s Astra and Anthropic’s Claude Opus 5 decoded multiple long-unsolved Enigma messages using LLMs. One Astra result recovered plaintext of a message that had baffled researchers since 2005. This leaves just seven unbroken Enigma messages (plus one with known plaintext), and more may be broken as models are reused against remaining records.
Deep Learning Weekly published Issue 474 covering new deep-learning and AI agent releases, benchmark findings, and research papers. Pricing and performance updates include Anthropic’s Claude Opus 5.5 at $4/$20 per million tokens, 40% below Opus 5, with a 66.4% Terminal-Bench 4.0 score and output over 30% faster. The issue adds new references for model/tool adoption and introduces research like RRSI that aims to improve agent-harness self-improvement while limiting overfitting and reducing policy-token use by 30%.
Perplexity Research trained a model in its Computer agent using real user sessions that included failures, applying rejection-sampling fine-tuning plus hint-guided self-distillation. In a live A/B test, tool-call failures fell from 2.24% to 1.77% across two trained checkpoints, a reported 21.2% relative reduction. The improved checkpoint runs only as an internal option inside Perplexity Computer and the post-trained weights or training code were not released, so it is not directly deployable elsewhere.
TypeSafe JEV 1.13, a hosted decision-only LLM judge, matched GPT-6 on routine preference and evidence-grounded factuality but not on hard correctness tests.
It cost $0.044 per 1,000 judgments versus GPT-6 at $12.18 (about 277x cheaper).
Using JEV’s calibrated confidence to run a cascade cut spending by escalating 34% of items to GPT-6 while reaching 91.3% accuracy, but it still lagged on JudgeBench hard correctness by 14.6 points.
AI 2027 debates raised concerns that a “neuralese recurrence” design could let models think harmful ideas without leaving detectable English chain-of-thought. The article points to Jakub Pachocki’s claim that Astra’s computation depth is within a factor of two of GPT-4. The discussion shifts from fear of unmonitored looping to a more technical argument about how recurrence changes simulated vs real layer depth and why chain-of-thought bottlenecks may still limit alignment risk, while acknowledging “true neuralese” is not yet realized.
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