What: The /model command now validates custom model names by making a test API request before accepting them.
How to use:
# Try setting a custom model - it will be validated first
/model claude-opus-4-20250514
# If the model doesn't exist, you'll get an error immediately:
# "Model 'claude-opus-4-20250514' not found"
Details:
Validation occurs automatically when setting custom models
Built-in models (sonnet, haiku, opus) bypass validation for faster response
Validated models are cached to avoid repeated API calls
Provides specific error messages for model-not-found vs other API errors
Evidence: HDB() at line 425289 in v1.0.111.js
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agree/model now validates provided model names
