That was fast. OpenAI restructured its Microsoft deal on Sunday, loosening the cloud exclusivity clause. By Monday, Amazon was already there with a partnership announcement. GPT-5.5, Codex, and a new Managed Agents service are coming to Amazon Bedrock.
What exactly lands on AWS?
Three building blocks, all in limited preview:
OpenAI models on Bedrock: GPT-5.5 and GPT-4 become directly available through Amazon Bedrock. Enterprise customers can use OpenAI models in their existing AWS environments without building separate infrastructure.
Codex on Amazon Bedrock: OpenAI’s coding agent now runs in AWS environments too. Authentication via AWS credentials, inference through Bedrock infrastructure. For teams already deep in the AWS ecosystem, this is a much lower barrier to entry than going through Azure.
Amazon Bedrock Managed Agents: A new service that lets you build sophisticated agents with memory — powered by OpenAI. This is the most interesting component because it combines OpenAI’s models with Amazon’s infrastructure strengths.
The strategic context
The timeline matters. On Sunday, Microsoft announces that OpenAI products will appear ‘first on Azure’ — but no longer exclusively. One day later, Amazon is ready to go. This was clearly no coincidence. It was prepared well in advance.
Microsoft stays the primary cloud partner. The IP license runs through 2032, revenue-share payments through 2030. But the door for other cloud providers is now open — and Amazon walked through it first.
What this means
For enterprise customers, this is good news: more choice, less vendor lock-in. For cloud providers, a new competition for the best AI models has begun. And for Anthropic? They no longer have Google and AWS as their exclusive cloud home — they now have to share that space with OpenAI.
The multi-cloud era of foundation models has officially arrived.
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