Last week, Google just dropped a bomb model in the market – Gemini 2.5 Flash Image, also known as Nano Banana. And what a delight to use it is! It responds quickly, takes care of almost all the basic editing tasks, and not to forget – it’s just pure fun to play with. I tested it out on a mix of image editing and image generation tasks and ended up loving it way more than I thought I would. I guess all the buzz around it on X is REAL! On the other hand, ChatGPT’s 4o and GPT-5 are also quite good for image generation and editing tasks. So I thought, why not compare both these models on similar prompts and see which one wins? This is all about Nano Banana vs GPT-5/4o for image editing and generation tasks. Let’s gooo!
I have used the chatbot interface for this article, here’s how you can access both the models:
Nano Banana: You can simply download the app on your phone, or visit Gemini/Google AI Studio and access the model by selecting 2.5 Flash at the top and clicking on “Create Images” under the Tools section. (free tokens:32768)
ChatGPT: I have used my plus account for accessing GPT-5. You can use the web interface of the model or the app.
Task 1: Changing Outfit
Change the outfit of the person in the picture to a powder blue pantsuit!
The result is clear. While Nano Banana successfully altered the outfit and preserved the original facial expressions with high fidelity, GPT-5, despite doing an excellent job with the outfit change, failed to maintain the facial details. In this comparison, Gemini 2.5 Flash is the clear winner, excelling in both criteria
Task 2: Create an Ad Banner
Generate an image of a billboard in the middle of the desert with the following image:
Output:
This is a close call, and I think both models performed well, making it hard to pick a single winner. GPT-5’s output has a more zoomed-in, focused view of the banner. Meanwhile, Gemini 2.5 Flash’s image includes more desert-like environmental elements. Since they excel in different areas, I’d call it a tie.
Task 3: Generating a New Image with an Old One
Use the faces from this picture. Show them happy and laughing at a fancy dinner table.
GPT-5’s output has critical flaws: it failed to preserve the likeness of all three people, and the image feels stiff and uncreative. Nano Banana, however, achieved a remarkably natural and convincing result. Gemini 2.5 Flash that takes the crown, mastering the prompt to deliver a superior image that is both creative and authentic.
Task 4: Multi-step Prompt for Editing an Image
Make the following edits to this image: – Remove all people from the background. – Brighten the face. – Remove skin imperfections and marks. – Make the lipstick color more vibrant and bright. – Replace the entire image with a photo of a single banana on a clean, pure white background.
GPT-5’s output showed a critical lack of prompt adherence, altering the face, image dimensions, and key details like the items in hand – resulting in zero originality. Conversely, Gemini 2.5 Flash accurately implemented all changes as requested. The winner, delivering both accuracy and faithfulness to the source, is unequivocally Gemini 2.5 Flash.
Task 5: Adding a New Person in the Image
Add Sam Altman as third person in this picture.
Both models performed well, but Nano Banana wins with its superior output. The image boasts sharper facial details on Sam Altman and a more natural adjustment of the gap between the two people, making the final composition more cohesive and realistic.
Task 6: Enhance the Image
Enhance this image. Apply a bold, high-contrast look with rich, deep shadows and vibrant, saturated colors. Make the colors pop without looking unnatural.
GPT-5 unfortunately made another significant error, as clearly visible in the result. In contrast, Nano Banana successfully enhanced the image by improving sharpness and boosting color vibrancy. This consistent performance solidifies Nano Banana’s superior capability in image enhancement tasks.
Final Verdict: Nano Banana vs GPT-5
Task
Winner
Key Reason
Changing Outfit
Nano Banana
Preserved facial details accurately while changing the outfit.
Create an Ad Banner
Tie
GPT-5 had a focused view; Nano Banana included better environmental context.
Generate New Image
Nano Banana
Produced a natural, creative result without altering facial likeness.
Multi-Step Editing
Nano Banana
Followed all instructions accurately; GPT-5 altered key details.
Adding a New Person
Nano Banana
Achieved sharper facial details and more natural composition integration.
Enhance Image
Nano Banana
Improved sharpness and color vibrance without errors.
I thoroughly enjoyed using Nano Banana for this research, and it has undoubtedly become my go-to model for image-related tasks. Its success isn’t accidental – Gemini 2.5 Flash (Nano Banana) represents a paradigm shift in the creative AI space. Early adopters are already using it to gain a significant competitive edge.
Whether you’re an agency streamlining workflows or an independent creator scaling your output, your ability to understand and leverage these capabilities will define your place in the evolving creative landscape. The technology is here, the performance is proven, and the efficiency gains are substantial. The question is no longer if AI will transform content creation, but whether you’ll lead that change or follow.
Let me know your thoughts in the comment section below!
Hello, I am Nitika, a tech-savvy Content Creator and Marketer. Creativity and learning new things come naturally to me. I have expertise in creating result-driven content strategies. I am well versed in SEO Management, Keyword Operations, Web Content Writing, Communication, Content Strategy, Editing, and Writing.
