How to use GPT-5.6

OpenAI has released GPT-5.6 models, merging ChatGPT’s macOS app with Codex and introducing ChatGPT Work. The new GPT-5.6 series features Luna, Terra, and Sol models, each with five thinking levels plus an Ultra mode that utilizes subagents and consumes usage limits faster. The update also includes a “ChatGPT Sites” plugin for building hosted websites and improvements in AI’s computer use capabilities, like self-driving the cursor.

• 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.
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