GPT Image and Nanobanana for real workflows
GPT Image is provided by OpenAI and emphasizes sharper detail and richer textures. Nanobanana, from Google, emphasizes fast generation and low cost. The stronger option depends on the input, output constraints, and review standard.
How to test GPT Image vs Nanobanana
Run the same prompt, source context, output format, and acceptance criteria through both models. Score accuracy, instruction following, edit time, latency, and current cost separately. Repeat the test on several representative tasks before standardizing on either model.