OpenAI adds GPT‑5.5 to Amazon Bedrock

OpenAI and Amazon Web Services said on April 28 that GPT-5.5, Codex and Managed Agents are now coming to Amazon Bedrock in limited preview. (openai.com) (aws.amazon.com) Amazon Bedrock is Amazon’s service for renting access to artificial intelligence models without running the systems yourself. OpenAI’s new listing means AWS customers can call OpenAI models from inside Amazon’s cloud tools and procurement stack. (aws.amazon.com) (openai.com) OpenAI said the AWS expansion covers three products: OpenAI models on AWS, Codex on AWS, and Managed Agents powered by OpenAI. The company said all three launched April 28 in limited preview. (openai.com) GPT-5.5 itself was introduced on April 23 as OpenAI’s newest flagship model for coding, computer use, data analysis and document work. OpenAI updated that post on April 24 to say GPT-5.5 and GPT-5.5 Pro were also available in the API. (openai.com) OpenAI said GPT-5.5 was rolling out in ChatGPT and Codex to Plus, Pro, Business and Enterprise users, while GPT-5.5 Pro was rolling out to Pro, Business and Enterprise tiers. In Codex, OpenAI’s developer docs call GPT-5.5 the recommended model for implementation, refactors, debugging and testing. (openai.com) (developers.openai.com 1) (developers.openai.com 2) AWS is also trying to make the switch easy for companies that already build with OpenAI’s software. Amazon’s Bedrock documentation says its OpenAI-compatible endpoints work with existing OpenAI SDKs by changing the base URL and API key. (docs.aws.amazon.com) That matters because many large companies do not want one model provider tied to one cloud vendor. Bedrock already sells access to models from multiple companies, and AWS says the service is used by more than 100,000 organizations. (aws.amazon.com) The timing also lines up with a change in OpenAI’s Microsoft relationship. OpenAI said on April 27 that it amended its Microsoft agreement, and an earlier joint statement said collaborations like the Amazon partnership were contemplated under those agreements. (openai.com 1) (openai.com 2) OpenAI framed the AWS move as a way for enterprises to use its models inside existing security, compliance and workflow systems. Amazon framed it as another step in turning Bedrock into a marketplace where customers can mix model providers without rebuilding their applications from scratch. (openai.com) (docs.aws.amazon.com)