GPT-5.5 and Codex Land on Amazon Bedrock, Ending Azure's Seven-Year Lock
OpenAI's frontier models — GPT-5.5, GPT-5.4, and open-weight variants gpt-oss-20b and gpt-oss-120b — are now available in limited preview on Amazon Bedrock, alongside the Codex coding agent and Bedrock Managed Agents. The launch follows a renegotiated partnership with Microsoft that lifted Azure's near-exclusive hosting rights after seven years. Enterprise customers can now build with OpenAI models inside AWS, using existing security controls and procurement paths without a separate Microsoft relationship.