OpenAI research explains why frontier models' reasoning is becoming harder to monitor
OpenAI's safety team studied why chains of thought in models like GPT-6 Astra increasingly evade oversight and found four training steps, including architecture choices and reinforcement learning, drive the loss. The analysis says this reflects tradeoffs around capability and compute cost rather than an unavoidable trend.
Reading a model's reasoning is a key safety check, and this shows labs can choose to preserve it if they accept some cost.
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DeepMind's AlphaProof Code formally verifies Signal's cryptographic core in four weeks
Google DeepMind's AlphaProof Code mathematically verified the core cryptographic code of Signal in four weeks, a task that usually takes years, with AI agents writing more than six million lines of proof code. DeepMind plans to apply the method to critical infrastructure such as power grids and medical devices.
Why it mattersAI could make formal proof of software correctness practical for security-critical systems that people rely on every day.
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Google releases Gemini 4 Hydrogen, now the default model in Search AI Mode
Google launched Gemini 4 Hydrogen, which it says handles multi-part questions, typos and very specific requests better, and it replaces the Flash series. It is available today in Search, the Gemini app, AI Studio, the Gemini API and Gemini for business.
Why it mattersBillions of searches and many developer apps will now run on this model, and independent tests suggest it offers near-top quality for less money than some rivals.
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Nvidia board reportedly prepares to remove CEO Jensen Huang after second affair report
Nvidia's board is reportedly preparing to dismiss CEO Jensen Huang after a report of a second alleged affair, this time with an executive who reports to him. This comes days after he admitted an affair with a woman alleged to be a Chinese spy.
Why it mattersA leadership change at the company that supplies most AI chips could affect chip supply, AI investment and US-China tech tensions.
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Jensen Huang resigns as Nvidia CEO after spy and affair scandals; CFO Colette Kress named interim CEO
Nvidia's board accepted Jensen Huang's resignation as CEO, president and board member, effective immediately. It followed reports of two affairs, one with an alleged Chinese spy and one with an Nvidia executive who reported to him. CFO Colette Kress is now interim CEO.
Why it mattersThe world's most important AI chip company has lost its founder, which could affect AI hardware supply, markets and US-China tech security debates.
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New York's AI safety law takes effect, adding oversight for OpenAI and Anthropic
New York is preparing to enforce its AI safety law, which requires major AI developers to register, disclose safety practices and report critical incidents. Companies that fail to comply face fines.
Why it mattersLarge AI developers now face binding state-level safety reporting rules that could become a model for other jurisdictions.
