GPT‑5.5 and Codex arrive on Amazon Bedrock in limited preview

Amazon Web Services and OpenAI said Tuesday that GPT‑5.5, GPT‑5.4, Codex, and OpenAI-powered Managed Agents are entering limited preview on Amazon Bedrock. (aws.amazon.com) (openai.com) Bedrock is Amazon’s service for running foundation models through one set of application programming interfaces, with AWS identity, logging, and policy controls wrapped around them. OpenAI said the Bedrock launch lets customers use its models inside the AWS systems they already buy and manage. (aws.amazon.com) (openai.com) AWS said the preview includes OpenAI’s latest models, Codex for software work, and a managed agent offering built on OpenAI systems. The company framed it as a way to use OpenAI tools through Bedrock’s model access, fine-tuning, and orchestration features. (aws.amazon.com) OpenAI said GPT‑5.5 is its “best frontier model” and positioned the AWS release around enterprise controls rather than a separate OpenAI-native stack. AWS said customers do not need to learn a new security model or configure extra infrastructure to start. (openai.com) (aws.amazon.com) Codex is OpenAI’s coding product for tasks like building features, refactoring code, reviewing changes, and handling releases across developer tools. OpenAI’s Codex materials describe it as a multi-agent coding system, and AWS is now offering it through Bedrock in preview. (openai.com) (aws.amazon.com) The move comes one day after Microsoft’s exclusive right to distribute OpenAI products ended, according to multiple reports on April 28. That timing turns Bedrock into a second major hyperscale route for enterprises that want OpenAI models without going directly through OpenAI or Microsoft Azure. (msn.com) (theregister.com) AWS also used the announcement to tie OpenAI’s models to Bedrock’s broader pitch around governance and production deployment. Amazon says Bedrock now serves more than 100,000 organizations worldwide, giving OpenAI immediate reach into existing AWS buying, billing, and compliance workflows. (aws.amazon.com) OpenAI separately rolled out GPT‑5.5 into its own Codex product last week and said the model is tuned for coding, computer use, and knowledge-work tasks. Bringing the same family of models to Bedrock reduces the gap between OpenAI’s direct tools and what large AWS customers can buy through their current cloud contracts. (developers.openai.com) (openai.com) For now, the release is still a limited preview, not a general launch. The immediate change is that companies already standardized on AWS can start testing OpenAI’s newest models and coding tools without leaving Bedrock. (aws.amazon.com)