One day. That's how long it took Amazon to move after Microsoft agreed to end its exclusive distribution rights to OpenAI's models. AWS announced on April 28 that it would offer a range of OpenAI products through Amazon Bedrock, including a new agent service.
The timing is notable. OpenAI and Microsoft restructured their partnership on April 27, ending an arrangement that had kept OpenAI's frontier models largely tied to Azure for commercial use. Amazon, which has spent two years building Bedrock into a multi-model marketplace - it already hosts models from Anthropic, Meta, and Mistral - was clearly ready to move the moment the door opened.
AWS customers can now access OpenAI models including GPT-4o directly through Bedrock without needing a separate OpenAI or Azure account. The new offering also includes an agent service: tooling that lets developers build AI systems capable of taking sequences of actions (browsing, querying databases, calling APIs) rather than just responding to single prompts.
For enterprise teams already running infrastructure on AWS, this removes the main reason to maintain a separate Azure relationship - access to ChatGPT-class models without an extra vendor account. That friction is now gone.
The move puts pressure on Microsoft. Azure's competitive argument with OpenAI has been straightforward: if you want the best models, you use Azure. With AWS now offering the same models through Bedrock, that argument weakens. Google Cloud will almost certainly follow with its own OpenAI agreement.