How to use GPT-5.6
new desktop app and hosted sites in ChatGPT
TL;DR
- OpenAI released GPT-5.6 models, merging the ChatGPT macOS app and Codex app into a new ChatGPT Work mode.
- New models include Luna, Terra, and Sol, each with thinking levels from light to Ultra mode, which uses subagents and increases usage consumption.
- A "ChatGPT Sites" plugin allows for building hosted websites with an optional "Login with ChatGPT" feature.
- The Codex app's AI models are enhanced for Computer Use, enabling them to control the cursor for tasks like opening apps and clicking buttons.
- OpenAI temporarily removed the 5-hour usage limit due to bug fixes following the app merge.
- Sol models excel at UI and writing, Terra offers minor improvements over 5.5, and Luna can struggle with ambiguous prompts but performs well with clear instructions.