Anthropic and Amazon announced a strategic partnership under which Amazon would invest up to $4 billion for a minority stake. AWS became Anthropic's primary cloud provider for mission-critical workloads, and Anthropic agreed to use Amazon's in-house Trainium chips for training and Inferentia for inference. The companies said they would expand Claude's availability on Amazon Bedrock with secure customization and fine-tuning. Anthropic stated it would keep its existing governance structure and Responsible Scaling Policy, including pre-deployment testing of new models. The deal was widely read as Amazon's answer to the Microsoft–OpenAI relationship.