How to Use the New ChatGPT: Complete Guide (Work, Codex, GPT-5.6)

OpenAI has significantly rebuilt ChatGPT, introducing Chat, Work, and Codex modes alongside new GPT-5.6 models like Sol, Terra, and Luna. The guide details how to set up the application, choose the right model and effort level, and navigate various subscription plans. It covers new desktop app features such as Projects, Skills, Templates, Plugins, Sites, Scheduled Tasks, Visualize, and Pets, aiming to help users transition their workflows, with comparisons to Claude throughout.

• ChatGPT has been rebuilt with new modes: Chat for quick conversations, Work for longer tasks and deliverables, and Codex for technical work with local files.
• New GPT-5.6 models (Sol, Terra, Luna) are available, each with different capabilities and speeds, alongside customizable ‘effort’ levels for processing.
• The platform now offers a desktop app for macOS and Windows, alongside web and mobile interfaces, with features rolling out gradually based on plan and region.
• Key new features include Projects (folder-based on desktop), Skills for consistent process execution, Templates for reusable workflows, Plugins for tool integration, Sites for website building, and Scheduled Tasks for automation.
• Setup involves configuring Custom Instructions, Memory, and Data Controls, with comparisons drawn to Claude’s existing features and workflows.
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