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Substack writers, you need a website

Substack is convenient, but treat it as a distribution tool for your content. Your content should live on an independently owned website, which has a domain name you control and own. This way, you …

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OpenAI just open-sourced Codex Security

Codex Security is an open-source CLI and TypeScript SDK for finding, validating, and reviewing security issues in code you own or have permission to assess.

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Visa lays off 7% of staff in renewed efficiency push

Ahead of reporting third-quarter earnings Tuesday, Visa announced it's laying off 7% of its workforce — roughly 2,600 people — as CEO Ryan McInerney pushes for greater efficiency. Technology and product teams were most impacted. In a memo to staff, McInerney cited a need to "focus on driving efficiency across the company in order to reinvest in our highest potential opportunities." Visa plans reinvestment in consumer payments, commercial and money-movement solutions and value-added services, including stablecoin. McInerney acknowledged that AI-related productivity gains factored in the layoff decision.

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Moonshot AI wants Nvidia chips to train next Kimi model

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Musk's tunneling startup eyes $20B valuation, new funding

The Boring Company is in discussions about to raise a fresh $4 billion in funding round that would value Elon Musk's tunneling startup at about $20 billion, The Wall Street Journal reports, citing anonymous sources. The SpaceX spinoff makes tunnel boring machines that promise to dig underground for less than the cost of traditional construction companies. In 2022, a $675 million funding round boosted Boring's value to about $5.7 billion. Notable investors at the time included Vy Capital, Sequoia Capital and Founders Fund.

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Massive AI spending spree appears to pass its peak

Corporate America has gotten hip to AI. Companies have realized recently that in order to perform everyday tasks, they don't necessarily need the most cutting-edge models that cost significantly more than less capable alternatives. "It’s like driving a Lamborghini to go to the grocery store to pick up milk," Cursor's Mike Saeks told The Wall Street Journal. The new, more cautious approach marks a departure from the recent days of "tokenmaxxing," in which firms encouraged spending based on the belief that it would improve output.

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Anthropic debuts Opus 5 amid sectorwide security concerns

Anthropic debuted a new AI model Friday as the tech world grapples with the fallout from a worrisome security breach. Claude Opus 5 "comes close to the frontier intelligence of Claude Fable 5 at half the price," the company said in a release, noting "it remains behind Mythos 5 on cybersecurity tasks." Anthropic released both Fable 5 and Mythos 5 last month, but temporarily restricted access to them due to government security concerns. Earlier this week, OpenAI blamed "a combination" of its AI models for breaching Hugging Face's internal systems.

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Tech leaders urge caution on AI model restrictions

The leaders of more than 20 tech companies including LinkedIn parent Microsoft and Nvidia are urging Washington not to rush to impose restrictions on open-weight AI models. In a joint letter, the coalition argues that open models fuel competition, and warns that clamping down on them risks AI power getting concentrated among a handful of proprietary models. The pushback comes as U.S. officials probe potential IP theft by Chinese firm Moonshot, whose model Kimi 3 has recently made waves.