OpenAI announced on June 1, 2026, that its GPT-5.5 and GPT-5.4 models, along with Codex, have reached general availability on Amazon Bedrock. The announcement represents a significant expansion of OpenAI's distribution strategy, bringing frontier models to AWS's enterprise customer base through a unified API.
GPT-5.5 and GPT-5.4 Models Available Across Multiple AWS Regions
The GPT-5.5 model is now available in the US East (Ohio) Region, while GPT-5.4 is accessible in both US East (Ohio) and US West (Oregon) Regions. This general availability follows an initial limited preview launch on April 28, 2026, indicating that OpenAI and AWS completed their validation phase with enterprise customers. According to OpenAI, GPT-5.5 is designed for the most demanding customer workloads, while GPT-5.4 offers the best price-performance ratio for production deployments.
Codex Introduces New Intelligence Class for Developer Workflows
Codex, powered by GPT-5.5 inference, introduces what OpenAI describes as a new class of intelligence optimized for complex, long-horizon developer workflows. The system is specifically designed for coding, reasoning, agentic workflows, and complex professional work, extending beyond simple code completion to handle multi-step development tasks that span extended timeframes.
Strategic Distribution Partnership Expands OpenAI's Enterprise Reach
The AWS Bedrock integration represents a major distribution partnership for OpenAI, allowing enterprise customers to access OpenAI models through the same unified API they use for models from Anthropic, Meta, and other providers. This positioning enables AWS customers to incorporate OpenAI's frontier models into existing Bedrock workflows without significant integration overhead, potentially accelerating enterprise adoption of OpenAI's latest capabilities.
Key Takeaways
- OpenAI announced general availability of GPT-5.5, GPT-5.4, and Codex on Amazon Bedrock on June 1, 2026, following a limited preview that began April 28, 2026
- GPT-5.5 is available in US East (Ohio), while GPT-5.4 is available in both US East (Ohio) and US West (Oregon) Regions
- Codex, powered by GPT-5.5 inference, is optimized for complex, long-horizon developer workflows including coding, reasoning, and agentic tasks
- The partnership allows AWS enterprise customers to access OpenAI models through Bedrock's unified API alongside offerings from Anthropic, Meta, and other providers
- GPT-5.5 targets the most demanding workloads while GPT-5.4 offers optimized price-performance for production deployments