CLAUDE_CODE_USER_DELEGATED_SESSION_ALLOWED_CHECK_MODELS

Updated November 9, 2026 by Alex Sorokoletov

CLAUDE_CODE_USER_DELEGATED_SESSION_ALLOWED_CHECK_MODELS is a Claude Code environment variable: Sets the models allowed as check models for a user-delegated session; defaults to claude-opus-5 and claude-opus-5-5. Added in v2.1.321 and still present in v2.1.321. It is not in the official reference.

How to set it

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

export CLAUDE_CODE_USER_DELEGATED_SESSION_ALLOWED_CHECK_MODELS=<value>
claude

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

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

Related variables

• CLAUDE_CODE_ALLOW_OTHER_MODELS: Set to 1 to start on a model that the --client-data-url document has no entry for, without applying its per-model client data, instead of exiting.
• CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK: Disables the organization-level eligibility check for fast mode.
• ANTHROPIC_CUSTOM_MODEL_OPTION
• ANTHROPIC_CUSTOM_MODEL_OPTION_DESCRIPTION
• ANTHROPIC_CUSTOM_MODEL_OPTION_NAME
• ANTHROPIC_CUSTOM_MODEL_OPTION_SUPPORTED_CAPABILITIES
• ANTHROPIC_DEFAULT_FABLE_MODEL
• ANTHROPIC_DEFAULT_FABLE_MODEL_DESCRIPTION

Frequently asked questions

All variables, searchable: Claude Code environment variables.