Anthropic filed its S-1 on October 26 to start its IPO process. The founders’ letter outlines ideals for AI: abundant intelligence, agents as labor, safety before speed and profit. It also acknowledges disruption, including job impacts. The letter describes a public benefit corporation and a long-term benefit trust to protect the mission. Forrester argues reality will test these ideals against five pressures. Rivals own the data centers Anthropic rents from. Anthropic can refuse customers like the Pentagon based on its principles. Regulations can override company ideals and force compliance. Anthropic’s safety standards do not bind other frontier labs. Customers may demand transparency Anthropic does not currently provide. Forrester advises enterprises to adopt a dual vendor frontier strategy. It warns platform lock-in comes from the harness and tools, not the model. The frontier is a zone with multiple shifting leaders.