Anthropic launches Claude dynamic workflows with up to 1,000 agents

On October 9 Anthropic moved dynamic workflows into public beta for Claude Managed Agents: a lead agent writes a JavaScript program that spawns up to 1,000 subagents (64 concurrent), run in the background on Anthropic's servers. It is enabled with the multiagent_20261001 flag. In an internal test the workflow found 66 of 70 planted bugs versus 14–27 for a single agent.

• Up to 1,000 agents per task, 64 running concurrently
• Enabled via the multiagent_20261001 flag, runs on Anthropic servers
• API of three primitives: agent(), parallel(), pipeline()
• Test: 66 of 70 bugs (94.3%) vs 14–27 for a single agent