Anthropic has raised an additional $4 billion from Amazon, and has agreed to train its flagship generative AI models primarily on Amazon Web Services

Anthropic’s latest funding round comes two months after OpenAI raised $6.6 billion in the largest startup investment on record. It also secured a $4 billion line of credit from a group of banks. OpenAI, which is now worth $157 billion, will invest the funds in AI research and compute infrastructure.

Amazon announced today that it’s pumping another $4 billion into Claude AI maker Anthropic, bringing its total funding amount to $8 billion. This latest round follows $1.25 billion last September and another $2.