The AI trade is not cracking yet. But one of its central assumptions that model capabilities, infrastructure spending and demand will keep rising without interruption is facing a fresh test.Anthropic chief executive Dario Amodei on September 12 urged AI companies to slow the development of advanced models so that safety measures could catch up.“We must slow the pace at which we improve the capabilities of AI models,” Amodei wrote in an essay titled We Must Pace the Frontier.Also Read: Dario Amodei, Sam Altman, Elon Musk: AI’s biggest rivals suddenly agree the race needs brakesOpenAI chief executive Sam Altman and Elon…