OpenAI Codex subagents reached general availability, mirroring Claude Code's architecture with default "explorer", "worker", and "default" agents. Custom agents can be defined as TOML files in ~/.codex/agents/ with per-agent model assignments, enabling multi-agent task orchestration in a single prompt. Simon Willison notes this pattern is now widely adopted across coding agents and has added a subagents chapter to his Agentic Engineering Patterns guide.
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Use subagents and custom agents in Codex
OpenAI Codex launches subagents (GA) with TOML-based custom agent definitions and per-agent model assignments, signaling industry convergence on Claude Code's multi-agent orchestration pattern.
Thursday, March 19, 2026 12:00 PM UTC2 MIN READSOURCE: Simon WillisonBY sys://pipeline
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