Anthropic opens IPO marketing as AI rout cuts OpenAI and Anthropic valuations

Valuations for OpenAI and Anthropic are falling as the AI market rout hits their fundraising, according to Bloomberg. The outlet adds that Anthropic starts marketing its IPO today, which it describes as a test case for the sector.

Neither company has confirmed the report in anything we could read. Bloomberg’s article could not be opened in full, so this story rests on its public headline and feed summary, plus the context below.

What the Bloomberg report says

Two points are public from the Monday piece. First, the sell-off in AI stocks is feeding through to private-market and fundraising pricing for the two leading labs, and their valuations are moving down. Second, Anthropic begins marketing its offering to investors on the same day.

The public text gives no price range, no deal size and no listing date. It also does not say how far either valuation has fallen. Those details are not established here, and any figure that circulates before the companies or a filing confirm it should be treated as a press report.

OpenAI’s round was already under pressure

The new report follows other coverage. As we reported on Saturday, OpenAI was reportedly valued below the level it wanted in its latest round. Bloomberg’s new headline suggests that the downward drift has continued as the market weakened, and it now covers Anthropic as well.

A market asked to absorb a lot of stock

Supply matters as much as sentiment. According to a summary on Techmeme of a report by The Information, AI companies other than Anthropic have already sold or priced a very large amount of stock this year, with more still on tap. The report raises the question of how much the market can take.

That context makes Anthropic’s timing awkward. A frontier lab going public into a falling market is a direct test of what investors will pay for AI revenue and growth after a sharp correction. A weak reception would likely weigh on OpenAI’s own fundraising. A strong one would suggest the rout has not closed the window for large AI listings. Bloomberg’s framing of a test case points to the same logic, though the public text does not say how it expects the test to go.

The stress is also visible outside the United States. Bloomberg separately reported on Monday that Taiwan stocks rose after authorities moved to stem a market rout there.

What readers should watch next

The first thing to watch is whether Anthropic or its advisers publish pricing terms as marketing proceeds. Official filings and company statements are the only reliable source for valuation, share count and timing. Until they appear, the Bloomberg report is the main evidence that valuations are falling, and it is a single outlet’s account.

Readers following the AI sector should also keep in mind that the report covers fundraising, not company performance. Nothing in the public text suggests a change in either company’s products or revenue. The pressure described is on how investors price them.