OpenAI
GPT Image 1.5 is built on OpenAI's language model architecture, giving it the deepest natural language understanding of any image generator. While FLUX and Midjourney interpret prompts as visual keywords, GPT Image 1.5 reads them as full sentences — understanding context, metaphor, spatial relationships, and narrative intent. This makes it the best choice for complex scenes with specific compositional requirements, abstract concepts, and multi-element illustrations.
GPT Image 1.5 has three quality levels with significant cost differences: Low (2 credits, fast — use for brainstorming and concept exploration), Medium (6 credits, default — good balance for most art), and High (20 credits — maximum detail for final pieces). Start with Low to test prompt ideas, then switch to High for the version you want to keep.
Unlike other models that work best with keyword lists, GPT Image 1.5 thrives on natural language. Write prompts like you're describing a scene to a person: "Create an image that captures the feeling of discovering an old library — towering bookshelves disappearing into shadow, a single reading lamp casting warm light on an open book, dust motes floating in the beam." The model parses sentence structure to understand emphasis, causality, and spatial layout.
Set Background to "Transparent" and output format to PNG to create stickers, game assets, UI elements, and design components with clean alpha channels. This is a unique strength — most other models can't generate with transparency. Describe the subject without any background: "A detailed crystal potion bottle with glowing green liquid, fantasy RPG item, front view."
GPT Image 1.5 supports up to 10 reference images for image-to-image editing. Connect an existing image and describe changes conversationally: "Make the sky a dramatic sunset orange," "Remove the car in the background," or "Change the character's outfit to medieval armor." The model's language understanding means edit instructions can be nuanced and complex.
Abstract compositional concept — GPT Image 1.5 understands "each quarter of the canvas" as a spatial instruction, not just a visual keyword. FLUX would struggle with this level of layout specificity.
An illustration that visualizes the concept of "time passing" — a single tree shown in four seasons simultaneously, each quarter of the canvas representing spring, summer, autumn, and winter, blending seamlessly at the borders
Narrative scene with causality — the model understands that light "spills" from windows "onto" cobblestones, creating coherent illumination rather than random lighting.
A cozy illustration of a small bookshop at night, warm light spilling from the windows onto rain-slicked cobblestones, a hand-painted sign reading "The Midnight Reader" above the door, watercolor and ink style
Multi-character composition — GPT Image 1.5 correctly places multiple characters in logical spatial relationships ("sitting on," "in the background") where other models often jumble the arrangement.
A whimsical children's book illustration showing a tiny fox teaching a class of woodland creatures, each animal sitting on a different mushroom "desk," chalkboard in the background with ABCs, soft pastel palette
Don't simplify your prompts for GPT Image 1.5 the way you would for FLUX or Midjourney. This model handles paragraph-length descriptions with multiple clauses and conditional instructions — use that to your advantage.
Low quality (2 credits) is 10× cheaper than High (20 credits). Use Low for concept exploration — you can generate 10 drafts for the price of 1 final image.
For sticker and asset creation, combine Background: Transparent + PNG output + a prompt that describes only the subject (no background). This produces clean cutouts in a single step.
GPT Image 1.5 generates 1-4 images per batch. For complex prompts, generate 4 at once — the model's interpretation varies enough between images to give you meaningfully different options.
GPT Image 1.5 excels at prompt comprehension over raw visual beauty. If you need a specific composition with multiple elements in precise spatial relationships, this model will understand your instructions better than any alternative. It's less "artistic" than Midjourney (won't dramatically beautify your prompts) and less photorealistic than Nano Banana 2 at 4K, but no other model matches its ability to interpret complex, nuanced descriptions. The transparent background feature makes it uniquely useful for asset creation workflows.
Connect GPT Image 1.5 with other AI models on Martini's infinite canvas. No GPU required — start free.
Get Started FreeBlack Forest Labs
FLUX.2 is the go-to model when you need your prompt followed precisely. Unlike Midjourney, which interprets and embellishes, FLUX.2 renders exactly what you describe — every element, spatial relationship, and style directive is respected. This makes it the strongest choice for concept art with specific compositions, multi-subject scenes, and illustrations that need to match a creative brief.
View guideMidjourney
Midjourney v7 is the most aesthetically opinionated image model available. Where other models faithfully reproduce your prompt, Midjourney actively interprets it — adding dramatic lighting, compelling composition, and artistic flair that transform simple descriptions into gallery-worthy images. This makes it ideal for concept art, illustration, and any project where visual beauty matters more than literal accuracy.
View guideIdeogram
Ideogram V3 is the only AI model that reliably renders readable text inside images. Every other model — FLUX, Midjourney, GPT Image — struggles with text accuracy, often producing garbled letters. Ideogram V3 solves this, making it the clear choice for poster art, book covers, logo concepts, infographics, and any visual design where typography is part of the composition.
View guideNano Banana 2 is Martini's default image model and the best all-rounder for most users. It supports both text-to-image and image-to-image editing, accepts up to 10 reference images, outputs at up to 4K resolution, and costs as little as 10 credits per image. Where Midjourney prioritizes aesthetics and FLUX prioritizes prompt fidelity, Nano Banana 2 balances both — producing photorealistic, detailed images that closely match your description.
View guide