ANTHROPIC_FOUNDRY_BASE_URL

Updated October 13, 2026 by Alex Sorokoletov

ANTHROPIC_FOUNDRY_BASE_URL is a Claude Code environment variable: Custom Foundry endpoint. 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_FOUNDRY_BASE_URL=<value>
claude

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

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

Related variables

ANTHROPIC_AWS_BASE_URL
ANTHROPIC_BEDROCK_BASE_URL: Alternative Bedrock endpoint (alias).
ANTHROPIC_BEDROCK_MANTLE_BASE_URL
ANTHROPIC_VERTEX_BASE_URL
ANTHROPIC_FOUNDRY_API_KEY: Foundry API key.
ANTHROPIC_FOUNDRY_AUTH_TOKEN
ANTHROPIC_FOUNDRY_RESOURCE: Foundry resource name.
ANTHROPIC_AWS_API_KEY

Frequently asked questions

What does ANTHROPIC_FOUNDRY_BASE_URL do?

Custom Foundry endpoint

Which Claude Code version has ANTHROPIC_FOUNDRY_BASE_URL?

Its release history is not tracked here.

How do I set ANTHROPIC_FOUNDRY_BASE_URL?

Export it before starting Claude Code (export ANTHROPIC_FOUNDRY_BASE_URL=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.