AWS–OpenAI pact: GPT-5.5, Codex land on Bedrock with $100B commitment

AWS and OpenAI announced an expanded partnership making OpenAI's frontier models (including GPT-5.5 and 5.4), Codex, and Bedrock Managed Agents available on Amazon Bedrock in limited preview. OpenAI is expanding its existing $38B AWS commitment by $100B over eight years; Amazon plans to invest $50B in OpenAI. The deal lands a day after OpenAI ended Microsoft cloud exclusivity.