Opus Orchestrator + Sonnet Workers Pattern — 90.2% Quality Gain.

Use Opus 4.6 as the lead agent for query decomposition and synthesis; spawn parallel Sonnet 4.6 subagents for each sub-question. Token cost is 15x single-agent chat but quality gains are 90.2% on complex research tasks. The cost-quality tradeoff is worth it for any task where accuracy matters more than latency. Anthropic Engineering