Claude Opus 4.8: Dynamic Workflows, 1,000 Subagents, and Cheaper Fast Mode — The Practical Guide for Vibe Coders

Anthropic shipped Claude Opus 4.8 yesterday, and the headline feature is a genuine architectural shift: dynamic workflows enabling hundreds of parallel subagents within Claude Code, with a cap of 1,000 concurrent subagents per workflow. Paired with a new cheaper Fast Mode pricing tier, this is the most significant Claude Code update since the tool launched. Here's what changed, what it enables, and how to put it to work today.