Codex can be configured to use OpenAI models available through Amazon Bedrock.
In this configuration, Codex runs locally in the Codex CLI, Codex desktop app, or Codex IDE extension, while model requests are sent to Amazon Bedrock. Codex uses Bedrock-supported authentication, and customers manage access through their AWS account, and something about how all of the requests conform to Bedrock policies/governance..
This article provides a general overview. For setup instructions, see Configure Codex with Amazon Bedrock.
How it works
When Codex is configured to use Amazon Bedrock:
Codex runs locally in the CLI, desktop app, or IDE extension.
Amazon Bedrock is configured as the model provider.
Authentication uses AWS credentials or another Bedrock-supported authentication method.
Inference requests are processed through Amazon Bedrock.
Amazon Bedrock provides an OpenAI-compatible Responses API implementation for supported OpenAI models.
The OpenAI-hosted Responses API is not in the request path.
What is supported
This configuration supports local Codex workflows, including:
Codex CLI local workflows
Codex desktop app local workflows
Codex IDE extension local workflows
Bedrock-backed inference using supported OpenAI models
AWS-managed access through IAM, model access controls, billing, quotas, Regions, and applicable Bedrock controls
What is not currently available
Some Codex features that depend on OpenAI-hosted cloud services, hosted tools, or cloud-managed tool discovery are not currently available when using Amazon Bedrock.
The following features are not currently available in this configuration:
Image generation
Voice transcription for input
Cloud plugin store
Cloud configuration and policy management
Codex cloud agents, including review, security, and web agents
Because MCP namespace tools and tool search are not currently available, MCP and tool discovery functionality may be limited in this configuration.
Feature availability may differ between Codex with ChatGPT sign-in, Codex with an OpenAI API key, and Codex with an Amazon Bedrock API key.
Compatibility notes
Codex on Amazon Bedrock is designed to provide a Codex local development experience using OpenAI models available through Amazon Bedrock. It should not be assumed to have identical feature availability or behavior to Codex backed by OpenAI’s API Platform.
Feature support may vary by:
Model
AWS Region
API surface
AWS account configuration
AWS release status
Support boundaries
For Codex client setup, configuration, CLI behavior, desktop app behavior, IDE extension behavior, or local Codex product experience, contact OpenAI Support.
For AWS credentials, IAM permissions, Bedrock model access, quotas, billing, regional availability, Bedrock request failures, AWS backend logs, or Bedrock service behavior, contact your AWS administrator or AWS Support.
Related documentation
Configure Codex with Amazon Bedrock.
OpenAI Codex CLI documentation
https://developers.openai.com/codex/cli
Amazon Bedrock documentation for OpenAI-compatible APIs
https://docs.aws.amazon.com/bedrock/latest/userguide/bedrock-mantle.html
AWS documentation for Bedrock authentication and model access
https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-openai.html