Claude Opus 4.8 Is Live: How to Use Dynamic Workflows for Hundreds of Parallel Subagents

Anthropic shipped Claude Opus 4.8 today with one headline feature: Dynamic Workflows. This lets a single orchestrator agent spawn hundreds of parallel subagents in real time, each handling a discrete subtask, with results aggregated back into the orchestrator's context. For developers doing serious agentic work — large codebases, parallel test runs, multi-file refactors, comprehensive security scans — this changes what's possible in a single session. Here's everything you need to know and a working implementation you can use today.