Claude Code now lets you pick a Claude model and effort level for each task

在 Claude Code 中选择 Claude 模型与努力级别

Anthropic added two controls to Claude Code: model selection and effort level. You can assign Opus to cross-file refactors, Sonnet to routine edits, and Haiku to quick fixes. Effort levels—low, medium, high—adjust how deeply the model thinks and how many tool calls it makes. High effort with Opus triggers multi-step codebase searches and test runs, but burns more tokens. The post doesn't disclose exact pricing deltas, only that high effort plus Opus is the most expensive combo. The update lets developers dial compute up or down per task instead of using one model for everything.

Why it matters: Official Anthropic product guide, not fluff. Effort-level behaviors are concrete (multi-step search, auto test runs), directly useful for daily users. Points off for no pricing comparison—only says high effort burns 'the most' tokens without numbers. Lands at the featured thre...