ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION

Updated October 13, 2026 by Alex Sorokoletov

ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION is a Claude Code environment variable: AWS region for small fast model on Bedrock. 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_SMALL_FAST_MODEL_AWS_REGION=<value>
claude

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

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

Related variables

ANTHROPIC_AWS_API_KEY
ANTHROPIC_AWS_BASE_URL
ANTHROPIC_AWS_WORKSPACE_ID
ANTHROPIC_BEDROCK_REGION_PREFIX
CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH: Skips credential resolution for the Anthropic AWS provider.
CLAUDE_CODE_USE_ANTHROPIC_AWS: Selects "Claude Platform on AWS" as the API provider.
ANTHROPIC_BEDROCK_BASE_URL: Alternative Bedrock endpoint (alias).
ANTHROPIC_BEDROCK_MANTLE_BASE_URL

Frequently asked questions

What does ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION do?

AWS region for small fast model on Bedrock

Which Claude Code version has ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION?

Its release history is not tracked here.

How do I set ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION?

Export it before starting Claude Code (export ANTHROPIC_SMALL_FAST_MODEL_AWS_REGION=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.