The battle between AI giants is rewriting an unwritten rule in Silicon Valley: investor loyalty. As record-breaking AI funding rounds reshape the artificial intelligence landscape, OpenAI Anthropic investors are increasingly overlapping — and traditional venture capital norms are being tested.

With OpenAI reportedly nearing a $100 billion funding round and Anthropic recently closing a massive $30 billion raise, venture firms are placing bets on both sides of the AI race.

OpenAI Anthropic Investors Now Overlap

At least a dozen direct investors in OpenAI also participated in Anthropic’s recent $30 billion funding round. Among them are major venture capital names such as Founders Fund, Iconiq, Insight Partners and Sequoia Capital.

In the hedge fund and asset management world, dual investments are common. Firms like D1, Fidelity and TPG typically invest across competing public companies without controversy.

But venture capital has traditionally operated differently. VCs position themselves as long-term partners to founders, often taking board seats and gaining access to confidential operational data. The expectation has been clear: support your portfolio company, especially against direct competitors.

The growing overlap among OpenAI Anthropic investors signals a shift in that mindset.

Why This Shift Matters

Startups routinely share sensitive business information with direct investors. When a VC invests in both OpenAI and Anthropic, questions naturally arise: where does loyalty lie?

The issue becomes more complex when board positions are involved. In Anthropic’s funding round, affiliated funds of BlackRock participated — even though BlackRock’s senior managing director and board member Adebayo Ogunlesi sits on OpenAI’s board.

In large asset management firms, different funds often operate independently. Still, the optics of cross-investment at this scale are notable.

The situation also highlights Sam Altman’s unique position. As former president of Y Combinator, Altman understands venture capital norms. Reports from Business Insider indicated that in 2024, Altman shared a list of rival AI companies he preferred OpenAI investors not back, including Anthropic, xAI and Safe Superintelligence.

Altman later denied barring investors from future rounds but acknowledged that those making “non-passive investments” in competitors would lose access to OpenAI’s confidential business information.

Record-Breaking AI Funding Changes the Rules

Artificial intelligence is attracting unprecedented capital. The largest AI labs are raising sums rarely seen in venture history, driven by extraordinary growth and massive data center demands.

In this environment, the opportunity for outsized returns can outweigh traditional notions of exclusivity. When funding rounds reach tens of billions of dollars, some firms appear unwilling to choose just one winner.

However, not all venture investors are doubling down on both sides. Andreessen Horowitz currently backs OpenAI but not Anthropic. Menlo Ventures supports Anthropic but not OpenAI. Other firms such as Bessemer Venture Partners, General Catalyst and Greenoaks appear to have invested in only one of the two AI companies.

The evolving behavior of OpenAI Anthropic investors underscores a broader transformation in venture capital dynamics.

Conflict of Interest Becomes a Founder Question

As AI startups compete for capital at unprecedented scale, founders may need to pay closer attention to investor alignment.

One industry investor noted that cross-investment may be considered less problematic if a firm does not hold a board seat. Still, the situation raises questions about governance and fiduciary responsibilities.

The shift reflects a new era in venture capital, where loyalty may increasingly take a backseat to opportunity.

With billions flowing into artificial intelligence and firms hedging bets across rivals, the concept of exclusive VC backing appears to be fading — at least in the AI arms race.