Anthropic IPO filing flags open-weight models as risk to frontier AI demand

Anthropic warns in its IPO filing that open-weight models may erode demand for costly frontier AI. The disclosure undercuts the growth narrative for Anthropic and similar AI leaders, suggesting pricing pressure and a narrower moat if customers opt for cheaper alternatives. Equity impact is concentrated in AI-related names; broader markets face limited direct fallout, though it reinforces concerns about AI capex returns.