Originally published on NextFuture Claude Code /advisor vs claude-code-router: Which Routing Strategy Wins (May 2026) TL;DR: Anthropic's built-in /advisor command picks the right Claude model (Opus 4.5, Sonnet 4.6, Haiku 4.5) for your current turn based on task complexity. claude-code-router is a community proxy that routes to non-Anthropic models too (DeepSeek, Qwen, GLM). Use /advisor for default Anthropic-first workflows; use the router when you need cross-vendor cost arbitrage. Both tools answer the same question — which model should run this turn? — but they answer it from very different layers. This post walks through what each does, when each wins, and a decision matrix you can paste into your team's playbook. What is /advisor /advisor is a first-party slash command shipped with Claude Code (Anthropic's CLI). It inspects the active conversation — file diffs, tool calls, context size, prior thinking depth — and recommends one of the three Anthropic tiers. It runs in-process, no proxy needed.…