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GPT-5.6 and ChatGPT Work Guide: Which Model to Use When

Guide

GPT-5.6 and ChatGPT Work Guide: Which Model to Use When

GPT-5.6's three model families (Sol, Terra, Luna) and how to get real work done with the ChatGPT Work agent. 15 ready-to-use mega-prompts, a model selection guide, and honest limits.

Mehmet Kocabaş
Mehmet Kocabaş17 Temmuz 2026

On July 9, 2026, OpenAI announced two things at once: GPT-5.6 (a three-model family: Sol, Terra, Luna) and ChatGPT Work, a Codex-based agent that takes a goal and can work inside your apps and files for hours. This guide covers what actually changed, which model to reach for and when, the prompting method that works, 15 copy-paste mega-prompts, and the honest limits you need to know so you don't trust the wrong job to it.

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