Amodei's AI Slowdown Warning Rattles Futures: Will Stocks Open Lower?

US stock futures fell sharply Sunday night after Anthropic CEO Dario Amodei published an essay calling on AI companies to slow the pace of frontier model development.

The essay landed hours before OpenAI CEO Sam Altman ruled out an initial public offering (IPO) this year, citing similar safety concerns.

Why Futures Are Under Pressure

Nasdaq 100 futures fell 1.2% in Sunday evening trading. In contrast, Dow Jones Industrial Average futures slid a smaller 0.4%, while S&P 500 futures lost 0.6%.

The declines extend a rough week for equities. The Dow just posted its worst weekly loss since March.

Amodei’s essay, titled “We Must Pace the Frontier,” urged AI firms to slow model capability gains.

“We must slow the pace at which we improve the capabilities of AI models.”

— Dario Amodei, in an essay

We Must Pace the Frontier: I’ve written a new essay on why the AI industry should slow down, with a three-part plan for doing so.Anthropic is unilaterally committing to the first of these steps. We’ll provide third-party evaluators with permanent, employee-level access to our…

— Dario Amodei (@DarioAmodei) September 12, 2026

However, the delay does not scrap OpenAI’s IPO entirely. OpenAI CFO Sarah Friar said last month the company still expects to go public in 2027 or sooner, according to CNBC. The sudden alignment among AI leaders on slowing down adds fresh uncertainty for investors.

What Could Shape Monday’s Stock Open

No major earnings reports or economic data are due Monday. Still, traders have little to weigh beyond the AI headlines and this week’s Federal Reserve meeting.

Fed funds futures point to a roughly 85% chance of a rate hike Wednesday, based on the CME FedWatch tool. Therefore, a hawkish surprise at that meeting could deepen Monday’s early losses.

Meanwhile, the debate over AI safety has spilled into Washington, where lawmakers are weighing calls for tighter oversight.

If futures losses hold into the opening bell, AI-linked stocks that led this year’s rally look most exposed. Whether the pullback deepens or fades by midday may hinge on how seriously investors treat Amodei’s warning.