OpenAI's ChatGPT Images 2.5 adds Sketch for doodle-based composition

OpenAI's ChatGPT Images 2.5, announced September 8, 2026, introduces Sketch: typing @Sketch opens a drawing canvas whose doodles act as a compositional reference alongside the text prompt. It moves image generation from text-only input toward hybrid text-plus-visual control. Available now on desktop, mobile, and web.