Blocking subagents from seeing each other's partial findings raises deep-research accuracy to 82.6%.

ArcticSwarm separates evidence gathering from evidence integration: subagents publish to a shared board, but gated isolation lets selected search tasks keep their own prior so parallel agents stop converging on an early candidate before alternatives are tested. On full BrowseComp-Plus with open-weight Qwen 3.5-27B it reaches 82.6%, against 78.8% without gated isolation and 74.5% with structured review also disabled. On live-web BrowseComp with GPT-5 it reaches 73.6% against MiroFlow's 63.4%. Restricting peer visibility improves a research swarm, which runs against every "shared context" instinct I had.