Thinking is the one setting that changes what you pay. It sets how much reasoning the model spends on composition and letterforms before rendering. There are four levels and the price scales with them.
Very low, 0.1 credits. Bulk ideation and thumbnails. Use it when you want twenty rough directions and expect to throw away eighteen. Text will often be wrong at this level, so treat any lettering as placeholder.
Low, 0.25 credits. Simple compositions without text. A single subject, a clean background, an obvious focal point. Good value for scene and mood work where nothing has to be read.
Medium, 0.5 credits. The everyday default, and what the tool ships with. Handles most scenes and short text well. If you are not sure what to pick, start here and only move up if the words come out soft.
High, 1 credit. Use it whenever the image has to carry legible words or a complex layout. Posters, packaging, book covers, signage, multi-element grids. It is the most expensive level on this model and still only one credit per image, so do not be shy with it on final renders.
A practical rhythm: explore at very low, refine at medium, deliver at high. The prompt does not need to change between passes, only the budget.