[UPDATE] OpenAI Brings Its Models to Amazon Bedrock

Amazon Web Services announced three new OpenAI offerings on April 28, within hours of OpenAI's exclusive relationship with Microsoft officially ending. The three additions to Amazon Bedrock, all currently in limited preview, are the latest OpenAI frontier models including GPT-5.5 and GPT-5.4, the Codex coding agent, and a jointly developed Managed Agents service.

The Managed Agents service is the most significant of the three. It deploys OpenAI's models and agent harness on AWS infrastructure, with per-agent identity, logged actions, and inference running inside the customer's own AWS environment. According to OpenAI's announcement, it is built for "faster execution, sharper reasoning, and reliable steering of long-running tasks." Sam Altman and AWS CEO Matt Garman announced the partnership jointly.

Codex on Bedrock connects the OpenAI coding agent into AWS through the Codex CLI, desktop app, and VS Code extension. All three services will move to general availability in the coming weeks.

What this means for AWS customers

For the millions of companies already running workloads on AWS, access to OpenAI's models now routes through existing Bedrock tooling rather than a separate API relationship. That simplifies procurement and drops OpenAI into existing model evaluation workflows alongside Anthropic, Amazon Nova, and other models available through Bedrock.

The Register's headline called it "OpenAI jumping out of Microsoft's bed, into Amazon's." That is colorful but not quite right. OpenAI's own API still exists, and the Microsoft partnership continues on a non-exclusive basis. The more accurate read: OpenAI is actively expanding distribution, and AWS gives it a channel into enterprise customers who already manage their AI vendor relationships through cloud consoles rather than direct API keys.

The speed of the AWS announcement, coming within hours of the Microsoft deal formally ending, suggests this was arranged well in advance of the public announcement.