What happened
On September 13 Anthropic CEO Dario Amodei urged adjusting the pace of AI development so safety measures can catch up, and OpenAI's Sam Altman and xAI's Elon Musk signaled agreement. Altman also said OpenAI will not list during 2026.
Why it matters
The news is being read as a possible turning point for generative AI and superintelligence development, and it triggered selling in Japanese AI-related shares — SoftBank Group fell more than 13% intraday on Monday the 14th, with Kioxia and other AI and semiconductor names also sold.
What to watch
Amodei is not calling for a halt to AI development, only for pacing the most advanced capability gains, so how far this shifts growth expectations for SoftBank Group, Kioxia Holdings and Advantest is the test.
WHO IT HITSShareholders in Japanese AI-infrastructure names — SoftBank Group, Kioxia Holdings and Advantest — are the most directly exposed, since the article says these three are the market's core AI-infrastructure stocks and the ones most affected by this news. Analysts and individual investors reassessing AI-related growth expectations are also in scope.
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The trigger was a public stance, not a product or a financial result. On September 13, Anthropic CEO Dario Amodei argued that the pace of AI development should be adjusted so safety measures can keep up, and the article notes that OpenAI's Sam Altman and xAI's Elon Musk signaled they share that concern. The article frames this as more than one company's positioning, and suggests it could mark a turning point in generative AI and superintelligence development.
That message arrived alongside a second signal: Altman indicated OpenAI will not go public during at least 2026. Read together, the article notes, the two developments can easily look like cold water thrown on the AI boom or a deferral of investment.
The market reaction came quickly. On Monday the 14th, SoftBank Group fell more than 13% intraday in Tokyo, and selling spread to AI and semiconductor-related shares including Kioxia. The article's focus is therefore on three names it describes as central to AI infrastructure in the Japanese market — SoftBank Group, Kioxia Holdings and Advantest — and on how the shift in the macro environment may play out for them. What the outcome hinges on is whether these developments prove to be a genuine turning point in the pace of AI development or a temporary caution, which is the question investors in these AI-infrastructure names will be watching.
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