What shipped in OpenAI Codex this month

Founders and PMs tracking the AI coding stack should not have to scrape OpenAI Codex changelogs by hand. SignalDigest watches public releases and shipping notes, then emails a Monday brief with source links only — weighted by real 2026 usage (Claude Code, Cursor, Copilot, Codex, and peers).

Every bullet is grounded in a URL. If we cannot cite it, we drop it.

• OpenAI Codex coding agent and API shifts
• Cross-tool moves that change how teams stack agents + IDEs
• Pricing, API, and model-routing changes that affect roadmaps