OpenAI gives GPT-5.5 Instant a readability upgrade while phasing out two older models

OpenAI is sunsetting ChatGPT’s Canvas interface.

OpenAI is sunsetting ChatGPT's Canvas interface, which allowed side-by-side code and text editing, removing it from GPT-5.5 Instant and GPT-5.5 Thinking while keeping it accessible via legacy models for a limited time. Teams that built Canvas-dependent workflows face a forced migration, and the simultaneous move to shorter, less structured GPT-5.5 Instant outputs signals OpenAI is prioritizing conversational fluency over document-style collaboration in its flagship models.