Discover more about what's new at AWS with   OpenAI GPT-5.4 and GPT-5.5 models now available in US East (N. Virginia) on Amazon Bedrock

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AWS has expanded availability of OpenAI's GPT-5.4 and GPT-5.5 models to the US East (N. Virginia) region on Amazon Bedrock. GPT-5.5 is OpenAI's most capable model, suited for advanced coding, research, analysis, and long-running agentic tasks. GPT-5.4 targets production applications requiring frontier reasoning, coding, computer use, and multi-step tool use. Both models feature a 272K-token context window, support text and image input, and are accessible via the Responses API with server-side and client-side tool calling, projects, and response streaming.