Claude Code Model and Effort Level Selection

Claude Code now lets you pick both the model and how thoroughly it works on a task.

You choose a model (Fable, Opus, or Sonnet) and a separate effort level that sets how thoroughly Claude works
Effort covers how many files Claude reads, how many verification steps it takes, and how deep it goes on multi-step tasks before checking back
Higher effort spends more tokens for more confidence, and the effort setting is guidance rather than a hard limit
Available to all Claude Code users across every supported platform