OpenAI's code-generation model lineage, originally released in 2021 as the engine behind GitHub Copilot, and relaunched as a full cloud-based coding agent in 2025. Part of the broader Code Agents shift from autocomplete to delegated engineering work. For FeatureOS/SupportWire, Codex and peers like Claude Code mean the question is no longer "can we build it" but "what's worth building."