Anthropic is preparing a multi-billion-dollar fundraising that would value the Claude chatbot developer at about US$350 billion, according to a report by Reuters on Wednesday, citing people familiar with the matter.  

That would be close to double the valuation it was said to have commanded roughly four months ago.

The company is aiming to raise around US$10 billion, with Singapore’s sovereign wealth fund GIC and Coatue Management expected to lead the round, the Wall Street Journal reported.

The deal could be wrapped up within weeks, although the terms may still shift. Anthropic, which counts Google and Amazon among its backers, declined to comment.

The surge comes as corporate spending on AI continues to climb, lifting valuations across the sector even as some investors warn of bubble dynamics. 

Reuters previously reported Anthropic was valued at US$183 billion after its US$13 billion Series F in early September 2025, up from about US$61.5 billion in March 2025.

The Financial Times reported last month that Anthropic had hired Wilson Sonsini as it weighs an initial public offering that could take place as early as 2026, and that it had also discussed a private round valuing it above US$300 billion. 

However, a spokesperson told Reuters at the time that no decision had been made on whether, or when, to list.

Anthropic has been making headlines over the past year. 

In November, Microsoft took a step away from its OpenAI partnership by striking a US$30 billion agreement with Anthropic to run its models on Azure. 

Under the deal, NVIDIA will invest US$10 billion in Anthropic, while Microsoft will put in US$5 billion. Anthropic has also committed to buying US$30 billion of Azure compute and may secure up to 1 GW more capacity to train and operate Claude, its rival to ChatGPT.

In the same month, Anthropic struck a deal with AI cloud provider FluidStack to develop US data centres to support its frontier models. 

The first two sites, in New York and Texas, will be built for Anthropic, with more locations planned. The company expects capacity to start coming online through 2026.