OpenAI Launches ChatGPT Work on GPT-5.6 and Raises Custom Instructions to 5,000 Characters

Releasebot (OpenAI release notes)·medium signal

OpenAI shipped ChatGPT Work, powered by GPT-5.6, which pulls context from a team's connected tools to turn scattered notes and drafts into finished output, alongside desktop app updates for switching between Chat and Work across web, mobile, macOS and Windows. Separately, custom instructions jumped from 1,500 to 5,000 characters for Plus, Enterprise, Business and Education users. The character-limit change is the quietly significant one — it's roughly the threshold where a persistent instruction block can carry real style and constraint specifications rather than a summary.