Anthropic's Opus 4.8 launch slid Dynamic Workflows in as a preview feature. The blog post called it a "hundreds of parallel subagents" feature in one line. That line is the load-bearing one. Here's what the preview actually does, the three tasks it eats alive, the one class of work where it loses you money, and the config you should pin on day one before the default settings burn down your billing.

The new Opus model comes with a tool called Dynamic Workflows, for coordinating swarms of subagents.

Anthropic releases Claude Opus 4.8 with dynamic workflows for Claude Code, enabling autonomous subagent orchestration for massive codebase migrations.