AWS Brings OpenAI GPT-5.6 to Amazon Bedrock, Enabling Codex CLI Integration

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AWS recently made OpenAI's GPT-5.6 available on Amazon Bedrock, allowing developers to access it via the Bedrock API using existing AWS credentials. The Codex CLI includes a built-in Bedrock provider that can be configured with command-line flags or by editing the ~/.codex/config.toml file. Users need the AWS CLI installed and configured with the AmazonBedrockLimitedAccess policy to authenticate and call the Bedrock endpoint. Notably, each Codex request carries approximately 9,400–9,500 tokens of system prompt and tool definition overhead, which developers should factor into cost and context estimates. As an alternative to standard AWS credentials, the Bedrock API Key method is also supported for those who prefer it.

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