Best AI Image Generator Comparison 2025 — Nano Banana vs GPT-4o vs Midjourney vs Flux Kontext

Best AI Image Generator Comparison 2025

Nano Banana vs GPT-4o vs Midjourney vs Flux Kontext

In this benchmark, we tested four of the best AI image generators of 2025 — Nano Banana, GPT-4o, Midjourney, and Flux Kontext (Flux.K) — across 13 detailed creative scenarios.
Each test uses the exact same ultra-descriptive prompt, revealing differences in realism, control, and creative interpretation between the models.

🧠 Why This Comparison Matters

Most reviews compare simple text prompts. Here, we use production-grade, professional prompts — the kind creative professionals actually use for design, product rendering, and storytelling.
This makes the results more meaningful for designers, marketers, and visual creators who care about precision and usability.

⚙️ Test Methodology

• 13 Ultra-Detailed Prompts: covering portraits, interiors, products, lifestyle scenes, illustrations, logos, and infographics.
• Same Inputs for All Models: prompts copied verbatim.
• Nano Banana images generated inside Lumabox’s fine-tuned workspace.
• GPT-4o, Midjourney, and Flux Kontext images generated using their default public model settings.

🧩 Results Overview

Each test below includes:

• Full Prompt text
• One result per model: Nano Banana, GPT-4o, Midjourney, Flux Kontext

1. Portrait / Lifestyle — Instagram Style

Prompt

A candid, high-end Instagram photo of a young woman standing on a sunlit city street. She wears a light beige oversized blazer over a white cropped tee, high-waist denim jeans, and chunky sneakers. One hand in pocket, the other holding an iced coffee cup. Golden-hour lighting with soft shadows across the pavement. Background shows blurred pedestrians and warm storefront reflections. Shot at 50 mm, f/2.8, shallow depth of field. Her hair is slightly messy, expression relaxed and natural. The overall mood is effortless, modern, aspirational.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

2. Interior Design — Modern Kitchen

Prompt

A spacious modern kitchen in a Scandinavian apartment photographed at eye level. Large island in white quartz with subtle gray veining, matte oak cabinets, black hardware, integrated appliances. Overhead, three slim cylindrical pendant lights in brushed aluminum hang evenly spaced. Behind the island: a wall of full-height cabinets with built-in oven and hidden refrigerator. Natural daylight streams from a right-side window with sheer linen curtains, casting soft shadows across the countertop. On the island: a wooden fruit bowl with green apples and a folded linen napkin. Light gray terrazzo floor, walls in warm white (#F4F1EE). The composition feels airy, balanced, and photorealistic.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

3. Product Photography — Designer Chairs

Prompt

A professional studio photo of three mid-century designer chairs arranged diagonally on a seamless neutral gray background. Left: a walnut-framed armchair with olive-green woven fabric cushion. Center: an Eames-inspired molded plywood lounge chair with black leather seat and polished aluminum base. Right: a minimalist oak dining chair with curved backrest and matte finish. All chairs evenly lit with soft-box lighting from above and slightly left; subtle reflections on floor surface. Shadows short and diffuse. Captured at 35 mm, f/8 for full sharpness. High-end catalog aesthetic, emphasizing craftsmanship, joinery details, and material texture.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

4. Product Photography — Functional Car

Prompt

A realistic outdoor car photoshoot of a compact adventure-style SUV parked beside a dirt trail in early morning light. Car painted in matte forest-green with black trim, roof rack mounted with cargo box and folded awning. Mud-splashed tires with visible tread texture. Background: pine trees, misty mountains, and a gravel path curving away. Camera at waist height, 35 mm lens, slightly front-three-quarter angle. Soft sunlight from left casts golden reflection along body panels. No people visible. Natural shadows under car, subtle dust particles in air. Realistic, documentary-style automotive photography.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

5. Fashion Scene — Studio Editorial

Prompt

A dramatic fashion studio photoshoot featuring a female model in a sculptural black avant-garde outfit with exaggerated shoulders and asymmetrical pleats. She poses with one knee bent forward, one hand on hip, chin lifted, looking off camera with confidence. The background is neutral gray with a subtle spotlight gradient. Lighting setup: one strong key light from above left creating defined shadows on floor, fill light from right for balanced contrast. Camera at low angle, 70 mm lens. The outfit fabric shows sharp edges, matte black texture with faint sheen. Overall mood: bold, editorial, runway energy, photographed in ultra-high detail.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

6. Lifestyle / Travel — Outdoor Ultralight Gear Shoot

Prompt

A commercial outdoor photo of a solo hiker in the wild carrying ultralight camping gear. The scene takes place at sunrise on a rocky ridge with golden fog in the background. The hiker wears a minimalist shell jacket (slate gray), lightweight hiking pants, and trail runners. On the ground: a compact tent, trekking poles, titanium cookware, and a rolled-up sleeping pad neatly placed beside a small backpack. Warm light from the left illuminates the subject’s face and gear surfaces. Composition follows rule of thirds, wide 24 mm lens showing vast landscape behind. The image should feel like an outdoor brand advertisement — crisp, realistic, adventurous.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

7. Illustration / Concept Art — Dune Style Desert Scene

Prompt

A cinematic concept art scene inspired by “Dune.” A vast desert under amber sky, giant sand dunes casting long shadows. In the mid-ground, a lone figure in desert armor stands beside a hovering ornithopter with folded wings, scale emphasized by distant sandstorm clouds. The armor has layered fabric and metallic tubing, subtle weathering, dust blowing around. Golden sunlight filters through haze, creating volumetric rays. Color palette: muted ochre, copper, and deep shadow blues. High-detail cinematic composition, widescreen 21:9 ratio. Should evoke grand scale, realism, and atmosphere.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

8. Illustration / Website Graphic — Modern Tech Aesthetic

Prompt

A clean vector-style 3D illustration for a modern technology website hero section. Composition features abstract floating panels, glowing data lines, and semi-transparent holographic UI elements in isometric perspective. Central focus: a stylized laptop emitting soft blue-white light, surrounded by geometric shapes (spheres, cubes, and gradient ribbons). Background: smooth gradient from deep navy (#0A0F2C) to cyan (#46C2E0). Lighting soft and volumetric, reflections subtle. Style: minimalist, futuristic, crisp edges, web-optimized layout with balanced white space.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

9. Portrait / Headshot — Face Only (Studio Realism)

Prompt

A hyper-realistic studio headshot of a young East Asian woman, framed tightly from forehead to collarbone. Shot with 85 mm lens at f/4, eyes perfectly in focus. Neutral gray background. Balanced softbox lighting from both sides, slight catch-light in eyes. Skin shows fine pores, tiny peach fuzz, natural tonal variations — not airbrushed. Hair softly parted, individual strands visible. Expression calm, lips gently closed. No jewelry or heavy makeup. The image should look like an untouched RAW photograph from a professional DSLR.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

10. Everyday Mobile Photo — Unedited Casual Snapshot

Prompt

A candid everyday photo taken with a mobile phone by a non-professional person. Subject: a man in his late 20s standing in a kitchen holding a mug, mid-sentence, slightly motion-blurred hand. Photo framed unevenly, horizon tilted. Overhead warm ceiling light creates uneven yellowish tone. Slight grain and chromatic noise in darker areas. Background cluttered with fridge magnets and countertop items. Color balance imperfect, mild overexposure near window. No aesthetic filter or correction — looks like a raw phone snapshot.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

11. 2D Illustration — Lifestyle App Graphic

Prompt

A 2D vector-style illustration for a wellness and lifestyle mobile app home screen. A friendly young woman sits cross-legged on a floor cushion, stretching arms upward and smiling. Behind her: abstract pastel panels resembling app UI cards (heart icon, calendar, step counter). Color palette: muted blues, warm beiges, and light coral (#E4B1A0). Flat shading, subtle gradients, soft shadow under character. Composition vertical with clean white space for app title. Style: friendly, minimal, suitable for app store download graphic.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

In this test, Midjourney and Flux Kontext clearly misunderstood the context provided in the prompt as they are not reasoning models. This means when you are using them, you should be aware of what is provided in the prompt.

12. Infographic — Productivity & Lifestyle Data Visualization

Prompt

A clean vertical infographic titled “Year in Focus 2025” for a wellness app report. Four sections: (1) Header with logo, title, subtitle. (2) Line chart: users grow Jan–Dec from 200K→1.8M, blue line with dots, light grid. (3) Three donut charts: Meditation 45%, Sleep 35%, Steps 20%, colors: blue #58A6E4, peach #F5B89E, green #9BC8A0. (4) Horizontal bars: NA 92%, EU 89%, AS 85%, SA 83%. Sans-serif labels, flat vector style, off-white (#F9F9F8) background, minimal shadows, Apple-like clean layout.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

13. Logo Design — Modern Brandmark with Icon & Text

Prompt

A vector-style logo for a sustainable travel brand called “Trailform.” Left: geometric icon combining mountain silhouette with a winding trail forming the letter “T.” Rounded corners, balanced negative space. Right: text “trailform” in modern sans-serif lowercase, medium weight, wide spacing. Colors: forest green (#3B5E43), sand beige (#E5D5B5), accent orange (#E97F4C). Clean composition on white background, symmetrical and print-ready, crisp edges, premium but friendly feel.

Nano Banana

GPT-4o

Midjourney

Flux Kontext

⭐ Comparison Results (13 Tests)

Legend: ★★★ = Best, ★★☆ = Good, ★☆☆ = Worst

🧠 What this means — strengths by task type

• Nano Banana
  Excels when brief fidelity and realism matter: designer product shots (Test 3), editorial studio (5), authentic casual/mobile look (10), and UI-oriented 2D illustrations (11). Performs solidly on most others. Great default for design and production workflows where accuracy beats flair.

• GPT-4o
  Strong at structured scenes and UI/2D deliverables: best on the Scandi kitchen (2) and ties best on app illustration (11). Generally “good” elsewhere, but can trail on automotive product realism (4). Reliable for balanced, instruction-following T2I.

• Midjourney
  Shines on style-led or cinematic visuals: cars (4), outdoor lifestyle (6), concept art & website graphics (7–8), face-only headshots (9), and also nails the unedited mobile vibe (10). Can be weakest when strict control/accuracy is required (1, 3, 12, 11).

• Flux Kontext
  Strong companion to Banana on catalog/product realism (1, 3) and generally stable across scenes. Can stumble on tight facial realism (9) and strict UI composition (11). Good for cinematic polish with moderate controllability.

Bottom line:

• Need precision & production-ready control → start with Nano Banana.
• Need clean structure/UI or descriptive scenes → GPT-4o (and Banana) are safe picks.
• Need cinematic, moody, or fashion-forward visuals → Midjourney leads.
• Need stylish realism with large scenes/products → Flux Kontext is a solid option, but double-check facial close-ups and UI layouts.

🧩 Verdict

If you need design-grade controllability and realism, Nano Banana clearly leads.
For conceptual ideation or moodboards, Midjourney and Flux Kontext excel.
GPT-4o performs well for balanced creative output but lacks pixel-level precision.

Try Nano Banana in Lumabox — the only platform that makes precision image generation part of a professional creative workflow.