CLAUDE_CODE_OAUTH_CLIENT_ID

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_OAUTH_CLIENT_ID is a Claude Code environment variable: Custom OAuth client ID. Present since v2.1.69 or earlier and still present in v2.1.294. It is not in the official reference.

Status	Present in v2.1.294
Added	Present since v2.1.69 or earlier
Category	Authentication
Official docs	Not listed

How to set it

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

export CLAUDE_CODE_OAUTH_CLIENT_ID=<value>
claude

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

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

Release notes that mention it

83 Undocumented Claude Code Environment Variables (v2.1.19)

Related variables

CLAUDE_CODE_DESIGN_OAUTH_CLIENT_ID
CLAUDE_CODE_CLIENT_CERT: Path to client certificate for mTLS.
CLAUDE_CODE_CLIENT_KEY: Path to client private key.
CLAUDE_CODE_CLIENT_KEY_PASSPHRASE: Passphrase for encrypted client key.
CLAUDE_CODE_CUSTOM_OAUTH_URL: Custom OAuth endpoint URL.
CLAUDE_CODE_OAUTH_REFRESH_TOKEN: OAuth refresh token.
CLAUDE_CODE_OAUTH_SCOPES: OAuth scopes for refresh token.
CLAUDE_CODE_OAUTH_TOKEN: Pre-configured OAuth access token.

Frequently asked questions

What does CLAUDE_CODE_OAUTH_CLIENT_ID do?

Custom OAuth client ID

Which Claude Code version has CLAUDE_CODE_OAUTH_CLIENT_ID?

Present since v2.1.69 or earlier and still present in v2.1.294.

How do I set CLAUDE_CODE_OAUTH_CLIENT_ID?

Export it before starting Claude Code (export CLAUDE_CODE_OAUTH_CLIENT_ID=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.