How to Choose GPT-5.6 Sol, Terra, and Luna: Chat Experience, Price, and Task Boundaries
OpenAI updated ChatGPT on August 6, 2026. GPT-5.6 Sol for Plus and Pro users is designed to give more focused and reliable answers, with a slider that changes how much thought ChatGPT uses. Free and Go users are gradually moving to GPT-5.6 Luna as the default model and gaining broader text-chat access plus a Think button for harder questions. This is a Chat experience change: OpenAI says the Sol model used by Work and Codex is not changing in this release. ENHE's existing Sol, Terra, and Luna selection page should therefore add the product-boundary check instead of creating a duplicate GPT-5.6 event page.

