The pattern that has held up across complex refactors, full WordPress migrations, and ground-up SAAS rebuilds is hierarchical: Claude Code (Opus 4.7) is the driver. Codex (GPT-5.5) is the worker. Claude Code plans, calls Codex to do the heavy execution, gets the results back, reasons over them, decides what’s next. The version stamps matter for an article like this. Opus 4.7 launched April 16, 2026. GPT-5.5 launched April 23, 2026. The framework we currently run on top of them — BEADS with Metaswarm v0.11.0 — landed mid-April.  The Quick Verdict Workload Where it lives Why Planning, architecture, ambiguous specs Claude Code (driver) Long-context coherence, self-verification sub-agents Long terminal runs, mechanical execution Codex (worker) Sustained 45+ minute runs, ~72% fewer output tokens Reasoning over returned work, integration, review Claude Code (driver) Review is folded into the driver’s loop, not a separate step Single-tool work that fits in one context window Either, alone Driver/worker…