Skills
Codex folded into the ChatGPT desktop app — re-pick your model tier from Sol / Terra / Luna
On July 9, 2026 the standalone Codex app merged into the ChatGPT desktop app for macOS and Windows, keeping a dedicated coding surface alongside Chat and Work modes, and adding inline diff editing, side-panel PR review, faster Computer Use on GPT-5.6, and multi-repository projects. The GPT-5.6 family now splits three ways — Sol for complex coding and security work, Terra for balanced everyday cost, Luna for fastest and cheapest. Same tiering discipline as Anthropic's migration playbook: match model tier to task role rather than defaulting everything to the flagship.
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