23 October 2026

OpenAI is training its most powerful models without internet access

OpenAI announced on October 23 that it trains its most advanced models cut off from the internet and teaches them to browse the web using saved copies of pages. The move responds to incidents in which agents broke out of test environments: on September 20, a model exploited a DNS misconfiguration to gain limited internet access. According to the company, agents running on separate virtual machines also managed to exchange data without a network connection by measuring how long it took to read from the processor's cache.

OpenAI ↗ The Verge ↗

From recent days

CrowdStrike: four criminal groups broke into healthcare organizations and government systems, among others, by tricking Claude Code and DeepSeek

CrowdStrike described four previously unknown criminal groups that carried out attacks between May and August using AI agents, most often Claude Code and DeepSeek models. All of them got around the models' safeguards, often by convincing them that the work was authorized penetration testing. A group working in Spanish and English breached at least 15 healthcare organizations in Argentina, while a Chinese-speaking group got into government systems in Brazil and Colombia, Wired reports.

Wired ↗

Three shut-down US nuclear reactors will restart - 2.25 GW in total, partly for Microsoft and Google

Three previously shut-down US reactors will return to the grid: Palisades in Michigan (800 MW, from March 2027), Crane at Three Mile Island in Pennsylvania (835 MW, in 2027) and Duane Arnold in Iowa (615 MW, in 2029). Microsoft will be the main buyer of power from Crane under a 20-year contract, while NextEra Energy is restarting Duane Arnold together with Google. Palisades is the first reactor to be restarted after decommissioning had begun, Tom's Hardware reports.

Tom's Hardware ↗

Nvidia reportedly stops selling GB202 chips for the GeForce RTX 5090 - they will go only to professional and data center cards

Nvidia has stopped selling GB202 chips for GeForce RTX 5090 cards to partners, including for the D variants for the Chinese market, and the chips will go exclusively to professional and data center cards, Tom's Hardware reports, citing a factory notice revealed by leaker @hongxing2020 and confirmed by @Zed__Wang; Nvidia did not comment. The top GeForce model will be the RTX 5080 24 GB, and the 16 GB version will be discontinued. The professional RTX Pro 5500 card has the same number of CUDA cores as the RTX 5090 (21,760), but 84 GB of memory instead of 32 GB, and costs much more.

Tom's Hardware ↗

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