Fabio Panetta, a member of the European Central Bank’s Executive Board, warned that overly optimistic artificial-intelligence valuations could leave markets vulnerable to a correction. His comments came as Anthropic CEO Dario Amodei and OpenAI CEO Sam Altman called for slower development of advanced AI models, prompting investors to reassess AI infrastructure spending and growth expectations. AI-linked equities, including the Nasdaq 100 and chipmakers, have declined, while prediction markets assign a 1.8% probability to Anthropic reaching a $600 billion valuation by December 31, 2026. The pricing reflects weaker confidence in high-end AI valuation targets and concern that slower development could affect Anthropic’s expansion and broader sector prospects.