ANTHROPIC_SMALL_FAST_MODEL
Updated by Alex Sorokoletov
ANTHROPIC_SMALL_FAST_MODEL is a Claude Code environment variable: Override small/fast model for quick operations. Its release history is not tracked here. It is listed in the official reference.
| Status | Present in v2.1.294 |
|---|---|
| Category | Models and thinking |
| Official docs | Listed |
How to set it
For one session, export it in the shell that starts Claude Code:
export ANTHROPIC_SMALL_FAST_MODEL=<value>
claudeTo apply it to every session, add it to the env object of a settings file:
// ~/.claude/settings.json
{
"env": {
"ANTHROPIC_SMALL_FAST_MODEL": "<value>"
}
}Related variables
ANTHROPIC_CUSTOM_MODEL_OPTIONANTHROPIC_CUSTOM_MODEL_OPTION_DESCRIPTIONANTHROPIC_CUSTOM_MODEL_OPTION_NAMEANTHROPIC_CUSTOM_MODEL_OPTION_SUPPORTED_CAPABILITIESANTHROPIC_DEFAULT_FABLE_MODELANTHROPIC_DEFAULT_FABLE_MODEL_DESCRIPTIONANTHROPIC_DEFAULT_FABLE_MODEL_NAMEANTHROPIC_DEFAULT_FABLE_MODEL_SUPPORTED_CAPABILITIES
Frequently asked questions
What does ANTHROPIC_SMALL_FAST_MODEL do?
Override small/fast model for quick operations
Which Claude Code version has ANTHROPIC_SMALL_FAST_MODEL?
Its release history is not tracked here.
How do I set ANTHROPIC_SMALL_FAST_MODEL?
Export it before starting Claude Code (export ANTHROPIC_SMALL_FAST_MODEL=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.