Anthropic may not secure investment-grade rating after IPO: FT

A rating of 'investment-grade' versus 'junk' determines how cheaply a company can borrow and which bond funds are even allowed to hold its debt. Blackstone, with roughly $9 billion committed to Anthropic, had told investors the Claude maker would reach investment-grade by year-end. That call has now reversed: Blackstone expects a junk rating once Anthropic lists, a sharp change in view from one of its largest private lenders.

A junk rating would raise Anthropic's cost of debt and narrow its pool of buyers to high-yield funds rather than the conservative institutional investors who stick to investment-grade paper. That matters for a company planning an $800 billion AI spending program financed partly through credit markets. Partnerships with large tech backers could face tighter terms, and Blackstone's own $9 billion stake becomes a riskier, lower-rated position on its books.

The gap between Anthropic's spending ambitions and its likely credit grade exposes a broader strain in AI financing: labs burning cash at enormous scale are leaning on private credit giants like Blackstone rather than traditional investment-grade debt markets. Whether that is prudent risk-taking or a sign that AI infrastructure bets are being financed on shakier terms than headline valuations suggest is a genuinely open question, and reasonable analysts disagree on it.

The IPO itself, which the Financial Times says could land as soon as November, will be the test. Once major agencies assign their first formal post-listing ratings, markets will see whether Anthropic lands in high-yield territory as Blackstone now expects, or whether a stronger-than-anticipated listing pushes it toward the investment-grade outcome Blackstone abandoned.