OpenAI's Models and Codex Are Now on Amazon Bedrock

OpenAI’s models are now available through Amazon Bedrock. The two companies announced the partnership at an AWS event in San Francisco on April 28, with three offerings launching simultaneously in limited preview: OpenAI models on Bedrock, Codex on Bedrock, and a new product called Amazon Bedrock Managed Agents, Powered by OpenAI.

GPT-5.4 is available immediately. GPT-5.5, which OpenAI released on April 23, is coming within weeks.

What’s Available

OpenAI Models on Bedrock: Developers can access GPT-5.4 and GPT-5.5 through the standard Bedrock API alongside existing models from Anthropic, Meta, Mistral, and Amazon. No separate OpenAI account needed — existing AWS credentials work directly. Usage counts toward AWS spending commitments, which matters for enterprise teams managing cloud contracts.

Codex on Bedrock: Codex, which now has more than 4 million weekly active developers, is accessible through Bedrock infrastructure via the API, CLI, desktop app, and VS Code extension. The main enterprise pitch: your codebase gets processed through AWS data centers, not routed to OpenAI’s APIs directly, which addresses a common concern from companies with data residency or training-data policies.

Bedrock Managed Agents: This is a new infrastructure product that combines OpenAI’s agent harness with AWS scaffolding for deploying production AI agents. The premise is that building on the OpenAI agent harness rather than raw API calls gives teams a higher starting point, and Bedrock adds IAM access management, PrivateLink connectivity, CloudTrail logging, and compliance framework integration on top of that.

The Microsoft Angle

This partnership only became possible because OpenAI and Microsoft renegotiated their agreement. For years Microsoft held exclusivity rights that prevented OpenAI from distributing its models through competing clouds. That exclusivity ended, and the AWS deal was announced one day later.

Microsoft is not shut out — it remains a primary cloud partner and retains access to OpenAI technology. But OpenAI can now work with anyone. Expect partnerships with other cloud providers to follow.

The Deal

The financial terms run in both directions. According to The Register, Amazon is investing up to $35 billion in OpenAI as part of this agreement, conditional on OpenAI deploying two gigawatts of Amazon’s Trainium accelerators. OpenAI announced a partnership with AWS in February but the models-on-Bedrock launch is the operational piece going live now.

For enterprise developers, the practical change is straightforward: if your company already runs on AWS and has existing Bedrock access, you can add OpenAI models and Codex to your stack today without a separate vendor relationship or procurement process. The security controls are the same ones you already use for every other Bedrock model.

All three offerings are in limited preview. Access is available through the AWS Bedrock console.

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Sources: About Amazon, AWS Blog, The Register, SiliconAngle, Neowin