ANTHROPIC_BEDROCK_REGION_PREFIX

Updated October 13, 2026 by Alex Sorokoletov

ANTHROPIC_BEDROCK_REGION_PREFIX is a Claude Code environment variable. Its release history is not tracked here. It is listed in the official reference.

Status	Present in v2.1.294
Category	Cloud providers
Official docs	Listed

How to set it

For one session, export it in the shell that starts Claude Code:

export ANTHROPIC_BEDROCK_REGION_PREFIX=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "ANTHROPIC_BEDROCK_REGION_PREFIX": "<value>"
  }
}

Release notes that mention it

Related variables

ANTHROPIC_BEDROCK_BASE_URL: Alternative Bedrock endpoint (alias).
ANTHROPIC_BEDROCK_MANTLE_BASE_URL
ANTHROPIC_BEDROCK_SERVICE_TIER
ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION: AWS region for small fast model on Bedrock.
ANTHROPIC_AWS_API_KEY
ANTHROPIC_AWS_BASE_URL
ANTHROPIC_AWS_WORKSPACE_ID
ANTHROPIC_FOUNDRY_API_KEY: Foundry API key.

Frequently asked questions

Which Claude Code version has ANTHROPIC_BEDROCK_REGION_PREFIX?

Its release history is not tracked here.

How do I set ANTHROPIC_BEDROCK_REGION_PREFIX?

Export it before starting Claude Code (export ANTHROPIC_BEDROCK_REGION_PREFIX=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.

All variables, searchable: Claude Code environment variables.