Model Selection Fails for Slash Commands with Anthropic API

Question

**Bug Description**
The slash command documentation (https://docs.anthropic.com/en/docs/claude-code/slash-commands#frontmatter) mentions that a model can be specified for a slash command, however when I do specify it I get errors when using the command.

For example:

> /some-command-using-sonner is running… 
  ⎿  API Error: 404 {"type":"error","error":{"type":"not_found_error","message":"model: sonnet"}}

It is unclear to me if slash commands support model selection or not.

**Environment Info