The artificial intelligence startup Anthropic said on Friday it had raised an additional 4bn investment from its longtime backer Amazon.com, Amazon will maintain its position as a minority investor, the company said. Its AWS unit will also be Anthropic's official cloud provider. Anthropic also said it was working with AWS's Annapurna Labs on the development of future generations of Amazon's Trainium chips and plans to train its foundational models on the hardware. Britain's competition regulator had said in September that Amazon's partnership with Anthropic will not be referred for a deeper inquiry as it did not fall under its jurisdiction.