Anthropic's Claude Opus 5.5 Enables Parallel Website Performance Audits With Four Specialized Subagents

Claude Opus 5.5, released in September 2026 at 40% lower cost than Opus 5, is enabling developers to audit websites systematically before shipping by orchestrating four concurrent subagents across 20 performance checks. The approach leverages Claude's new capability to spawn multiple independent agents that run in parallel—each assigned a specific audit domain—to verify image optimization, font loading, CSS efficiency, lazy loading, and other Core Web Vitals compliance before deployment.