OpenAI Codex release notes: alpha.15 connects to Bedrock Runtime

OpenAI Codex 0.148.0-alpha.15 adds the built-in amazon-bedrock-runtime model provider. It sends local model requests to regional, OpenAI-compatible Bedrock Runtime endpoints and uses AWS authentication. The alpha was published on August 14. npm's stable channel remains on 0.147.0.

Codex CLI is OpenAI's local coding agent for the terminal. A model provider determines which service receives the agent's model requests and how the client authenticates.

OpenAI Codex release notes: Bedrock Runtime in alpha.15

The new provider is named amazon-bedrock-runtime. It uses regional addresses in the form https://bedrock-runtime.<region>.amazonaws.com/openai/v1 and AWS SigV4 with the bedrock service. Codex can also use a Bedrock bearer token. AWS profile, region, and transport settings can be set per provider.

This is a separate path from the existing amazon-bedrock provider for Bedrock Mantle. OpenAI's current Bedrock guide documents the Mantle configuration; Runtime support is documented in the official pull request and ships in 0.148.0-alpha.15.

Sources: OpenAI Codex 0.148.0-alpha.15. OpenAI Codex PR #38470 for Amazon Bedrock Runtime. OpenAI's guide to Codex and Amazon Bedrock.

Global and US routing for GPT-5.6

The Runtime catalog contains global and US cross-region variants of GPT-5.6 Sol, Terra, and Luna. Model IDs begin with global. or us., such as global.openai.gpt-5.6-sol. Codex prefers global routing for fallback models and background work.

Web search is disabled for amazon-bedrock-runtime. Do not choose this provider for a task that requires Codex's built-in web search.

Sources: OpenAI Codex PR #38470 for the model catalog, routing, and feature limits. npm registry for @openai/codex.

Human step: configure the Runtime provider

Use the exact 0.148.0-alpha.15 prerelease when testing this. Add the provider, an AWS profile, and a region to ~/.codex/config.toml:

model_provider = "amazon-bedrock-runtime"

[model_providers.amazon-bedrock-runtime.aws]
profile = "codex-bedrock"
region = "us-west-2"

The AWS identity must have access to the selected Bedrock model in that region. The provider can use a Bedrock API key or the AWS SDK credential chain. It does not use OPENAI_API_KEY for model requests.

There is no stable Codex CLI release with the Runtime provider yet. npm's alpha tag pointed to 0.148.0-alpha.15 when checked, while latest pointed to 0.147.0.

Sources: OpenAI Codex PR #38470 for the provider ID and AWS settings. OpenAI's Bedrock guide for authentication and local configuration. npm registry for published versions and dist-tags.