OpenAI GPT-5.4 and GPT-5.5 Models Released on Amazon Bedrock in US East Region

Amazon Bedrock expands to offer OpenAI's most capable generative AI models for advanced reasoning and coding applications.

By Lydia Stone · Editorial pseudonym · 2026-06-12 · 1 min read

AI-ASSISTED REPORTING · RETROSPECTIVE ARCHIVE

Retrospective edition: 2026-06-12. Source published: 2026-06-11. Added to this archive: 2026-11-03. This briefing was prepared later from the linked announcement; it was not published on this website on the historical edition date.

GPT-5.5 supports complex coding, research, and agentic tasks with broad tool use and long-context workflows, while GPT-5.4 enables frontier reasoning and multi-step verification. Both provide a 272K-token context and accept text and image inputs.

Available through the Responses API with server and client-side tool calling and response streaming, these models facilitate building sophisticated generative AI applications across domains. The launch extends their availability within AWS infrastructure as stated by AWS.

Source & further reading

OpenAI GPT-5.4 and GPT-5.5 models now available in US East (N. Virginia) on Amazon Bedrock ↗

Source published 2026-06-11. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.