OpenAI’s $100B Raise Tests Investor Loyalty as Backers Double-Dip in Rival Anthropic

New updates have been reported about OpenAI.

OpenAI is preparing to close a roughly $100 billion funding round just as many of its existing investors are also backing key rival Anthropic at a $30 billion valuation, underscoring shifting norms around investor loyalty in frontier AI. At least a dozen firms with direct stakes in OpenAI, including several major venture names and large asset managers, have now taken positions in Anthropic, effectively betting on multiple winners in the same high-stakes market.

For OpenAI, this dual-investor dynamic raises questions about competitive confidentiality and alignment at a time when it is scaling aggressively and sharing sensitive information with shareholders. Venture investors in private companies typically receive detailed nonpublic updates and sometimes board seats, but overlapping ownership in OpenAI and Anthropic blurs the traditional expectation that VCs will support one flagship bet per category.

The situation is more complex because OpenAI’s CEO Sam Altman comes from the venture world and has tried to define boundaries around investor behavior. In 2024, he reportedly circulated a list of rival AI labs, including Anthropic, xAI, and Safe Superintelligence, that he preferred existing OpenAI backers not to fund, particularly if those positions were active rather than passive. Altman later denied threatening to block investors from future OpenAI rounds, but he acknowledged saying that non-passive investors in rivals would lose access to OpenAI’s confidential business data.

Simultaneously, AI capital requirements are so large — driven by unprecedented data center and compute demands — that many investors view diversification across OpenAI and Anthropic as rational risk management. Large platforms like Microsoft and Nvidia are also seen as hedging their exposure across multiple AI labs, reinforcing the sense that ecosystem power may not be concentrated in a single winner. Nonetheless, some venture firms remain single-threaded: several notable funds back only OpenAI or only Anthropic, suggesting that traditional loyalty norms have not disappeared entirely.

For OpenAI’s leadership, these evolving investor patterns have practical implications for governance, information sharing, and future term sheet design. As the company moves toward finalizing its $100 billion round, it may need stricter conflict-of-interest and information-rights provisions to ensure that strategic plans, product roadmaps, and financial metrics do not indirectly benefit close competitors. Founders and executives across the AI sector are likely to follow OpenAI’s approach closely, as the industry’s fundraising scale is forcing a rapid rethinking of what constitutes acceptable investor behavior in direct rivalries.