Anthropic Launches Dynamic Workflows: Claude Now Orchestrates Up to 1,000 AI Agents in Parallel

Anthropic opened dynamic workflows in Claude Managed Agents to public beta on October 9, 2026, enabling a single prompt to launch and coordinate up to 1,000 AI agents in the background. The feature is triggered by adding the keyword "ultracode" to a prompt or activating the /effort ultracode setting in Claude Code, which directs Claude to automatically write and execute a workflow script that orchestrates multiple agents in parallel. The capability represents a significant step in multi-agent system scaling for the company's flagship Opus 5.5 model and marks a broader shift in how AI systems tackle complex tasks that require coordinated effort across many independent workers.