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OpenAI Codex Subagents Hit General Availability: Parallel Custom Agents via TOML, Matching Claude Code's Multi-Agent Architecture
OpenAI moved Codex subagents from feature-flag preview to general availability on March 16, enabling parallel agent spawning for codebase exploration, multi-step implementation plans, and other concurrent workloads. Default subagents include 'explorer,' 'worker,' and 'default' roles; custom agents are defined as TOML files in ~/.codex/agents/. The architecture closely mirrors Claude Code's subagent model, signaling convergence across the two dominant agentic coding platforms.
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