CLAUDE

Use opus, sonnet, haiku, and best to switch models easily.

Hybrid mode: Opus for planning, Sonnet for execution.

Extended context window for Opus and Sonnet on supported plans.

Low, medium, high, xhigh, and max for adaptive reasoning control.

Interactive UI to switch models and effort sliders mid-session.

2.5x faster Opus at a higher token cost (research preview).

Toggle with Alt+T. Claude reasons through complex problems before responding.

Add gateway or custom models to the picker via environment variables.

Reusable markdown files with instructions and workflows.

/simplify, /batch, /debug, /fast, and other built-in skills.

Trigger with /skillname or let Claude auto-load when relevant.

Configure model, effort, tools, MCP servers, and invocation scope.

Pass arguments to skills with string substitution support.

Hide skills from Claude's auto-selection until manually triggered.

Pre-approve tools before a skill executes so it runs without prompts.

Run a skill in an isolated context via fork mode.

Changes to skill files are detected and reloaded automatically.

Spawn isolated workers with independent context windows.

Researcher, auditor, reviewer, and other ready-made subagent types.

Create reusable subagent definitions at project or user level.