Nano Banana vs Seedream 4.5
Head-to-head across 17 challenges
Nano Banana
36.8%
win rate
Ties
15.8%
Seedream 4.5
47.4%
win rate
Challenge Results
Man and Car in California
Editing“Make a photo of the man driving the car down the California coastline”
AI Judge Analysis
Nano Banana
- + Excellent preservation of the source car's scale and orientation
- + Realistic motion blur on the road and wheels
- + Correctly captures the requested California coastline scenery
- − The man is very small and lacks detail
- − The man is placed in the passenger seat instead of the driver's seat
Seedream 4.5
- + Perfect preservation of the man's identity, hair, and outfit
- + High level of detail on the car's interior and exterior
- + Man is correctly positioned in the driver's seat
- − Anomalous open car door while the vehicle is in motion
- − The car's door and interior layout appear physically impossible/glitched at the bottom hinge area
Verdict: Seedream 4.5 is the clear winner for its superior ability to preserve the subject's identity and specific clothing. While Nano Banana captures the overall scene well, it places the man in the wrong seat and loses all facial detail. Despite Seedream 4.5's odd choice to leave the car door open, it creates a much more convincing composite of the two source images.
Candid Street Photography
Text-to-Image“A candid street photo of an elderly Japanese man repairing a red bicycle in light rain, reflections on wet pavement, shallow depth of field, 50mm lens, natural skin texture, imperfect framing, motion blur from passing cars, cinematic but realistic, no stylization.”
AI Judge Analysis
Nano Banana
- + Excellent environmental storytelling with the newspaper and tools
- + Stronger sense of place through the background architecture and lanterns
- + Captures the 'light rain' and pavement reflections beautifully
- − The car in the background is static rather than showing the requested motion blur
- − Composition feels a bit too balanced for 'imperfect framing'
Seedream 4.5
- + Perfectly captures the motion blur of passing cars as requested
- + More realistic skin texture and direct eye contact for a candid feel
- + Better adherence to 'imperfect framing' with a tighter, more spontaneous crop
- − The rear wheel/chain geometry and the wrench placement are physically nonsensical
- − The rain effect looks like static vertical lines rather than atmospheric droplets
Verdict: Nano Banana creates a much more aesthetically pleasing and coherent scene with superior details in the bicycle and environment, though it misses the motion blur requirement. Seedream 4.5 captures the specific 'candid' and 'motion blur' elements of the prompt more accurately, but suffers from significant AI hallucinations in the bicycle's mechanical structure. Nano Banana is the preferred image for its overall quality and believability.
Geometric Composition
Text-to-Image“A glass cube on a wooden table. Inside the cube is a small blue sphere. On top of the cube sits a red book. A green plant is behind the cube, partially visible through the glass. Soft window light from the left.”
AI Judge Analysis
Nano Banana
- + Excellent photographic quality and lighting
- + Captures the spatial relationship of all elements perfectly
- + The plant is lush and clearly visible through the glass
- − The sphere appears to be floating mid-air within the cube rather than resting
Seedream 4.5
- + Correctly identifies all scene elements
- + Good glass refraction and reflection on the table
- − The cube geometry is distorted and lacks a clear top face
- − The plant is poorly defined and blurry
- − The blue sphere is merged with the glass edge in a physically impossible way
Verdict: Nano Banana is the clear winner as it produces a highly realistic photograph with beautiful soft lighting and logical composition. Seedream 4.5 struggles with the geometry of the glass cube and the rendering of the plant, resulting in a much less convincing image.
Modern Clean Menu
Text-to-Image“Modern minimalist restaurant menu design, white background with colorful food photos in grid, sections for appetizers/pizza/mains, bold sans-serif fonts, vibrant accents, clean professional layout for casual dining.”
AI Judge Analysis
Nano Banana
- + Excellent text rendering with almost perfect spelling across the entire menu.
- + Perfect adherence to the 'food photos in grid' prompt with high-quality imagery.
- + Very clean, professional, and balanced layout that looks like a real-world design.
- − Small spelling error in 'Appetiers' and 'Margheiita'.
- − Total price uniforming ($5 for everything) is slightly unrealistic for a functional menu.
Seedream 4.5
- + Strong 'vibrant accents' with the colorful borders around image sections.
- + Clean, modern sans-serif typography.
- − Nonsensical text and repetitive menu items (e.g., 'Pizza' listed twice, 'Restaurant' as a food item).
- − The layout is a list rather than the requested 'grid' for food photos.
- − General lack of professional coherence compared to a real menu.
Verdict: Nano Banana followed the prompt with high precision, creating a professional-grade grid layout with remarkably clear and mostly accurate text. Seedream 4.5 failed to provide a grid and suffered from significant text hallucinations and repetitive list items, making it much less usable as a design template.
Bald man challenge
Editing“Give the person a full, thick head of natural hair with realistic texture, density, and a natural hairline. Preserve facial features and lighting.”
AI Judge Analysis
Nano Banana
- + Excellent realism in hair texture and stray strands
- + Maintains the lighting and color palette of the original image perfectly
- + Natural-looking hairline that blends seamlessly with the forehead
- − The glasses frames are slightly warped/melted into the temple area near the ear
Seedream 4.5
- + Strong prompt adherence regarding volume and density
- + Perfectly preserves the glasses and facial features without distortion
- + Integrates the hair well with the existing beard
- − The hairline transition is a bit soft and lacks the fine detail of individual hairs
- − The texture of the hair feels slightly smoother and less 'natural' compared to Model A
Verdict: Both models did an excellent job of following the edit instructions while preserving the source image's identity. Nano Banana (Model A) provides much more realistic hair texture with convincing flyaways and lighting, but it introduces a minor artifact by warping the glasses frame. Seedream 4.5 (Model B) preserves the glasses perfectly and offers a very plausible head of hair, though the hairline is slightly less detailed than Nano Banana's.
Isometric Miniature Diorama Scenes
Text-to-Image“Create a clear, 45° top-down isometric miniature 3D cartoon scene of Japan's signature dish: sushi, with soft refined textures, realistic PBR materials, gentle lighting, on a small raised diorama base with minimal garnish and plate. Solid light blue background. At top-center: 'JAPAN' in large bold text, 'SUSHI' below it, small flag icon. Perfectly centered, ultra-clean, high-clarity, square format.”
AI Judge Analysis
Nano Banana
- + Perfectly rendered text and flag icon exactly as requested.
- + Clean, 3D clay-like aesthetic with soft lighting.
- + Accurate sushi varieties including maki and nigiri.
- − The rice texture is slightly repetitive and feels more like beads than cohesive grain.
Seedream 4.5
- + Excellent PBR materials with realistic subsurface scattering on the fish.
- + Beautiful depth of field and soft lighting that enhances the miniature feel.
- + Dynamic composition with a well-modeled diorama base.
- − The flag icon is placed to the side rather than following the 'Japan/Sushi/Flag' vertical hierarchy requested.
- − The diorama base texture is a bit gritty, leaning away from the 'ultra-clean' requirement.
Verdict: Nano Banana followed the layout instructions more precisely, especially regarding the text placement and the clean, isometric look. Seedream 4.5 produced a more visually sophisticated image with superior material rendering and realistic lighting, though it took some creative liberties with the requested text layout.
Night Sky Transformation
Editing“Change the scene to night: a deep, dark sky with subtle, glistening stars visible behind the mountain.”
AI Judge Analysis
Nano Banana
- + Perfect source preservation of the landscape and village layout
- + Realistic night lighting that correctly darkens the mountain face
- + Beautifully rendered starry sky that looks natural
- − None notable
Seedream 4.5
- + High image quality and sharpness
- + Retains the layout of the source image well
- − Fails to realistically darken the mountain, which still looks like it's in bright sunlight
- − Stars are sparse and less impressive than Model A
Verdict: Nano Banana successfully converted the entire scene to night, realistically darkening the Matterhorn and adding a dense, beautiful starry sky while perfectly preserving the village. Seedream 4.5 changed the sky but failed to adjust the lighting on the mountain, resulting in an inconsistent image where the peak is still bathed in bright golden sunlight despite the dark sky.
Adorable Baby Animals in Sunny Meadow
Text-to-Image“Hyper-photorealistic scene of fluffy baby animals—a golden retriever puppy, tabby kitten, baby bunny, and red fox kit—with big expressive eyes and ultra-detailed soft fur, playfully chasing butterflies and tumbling together in a lush wildflower meadow, warm golden sunrise light with god rays and dew sparkles, joyful wholesome vibe, 8K masterpiece.”
AI judge analysis unavailable for this challenge.
Over-the-top cartoon caricature
Editing“Create a caricature of me and my job. Make it exaggerated and humorous, incorporating my profession as a tv show anchor and my love for dogs and hockey.”
AI Judge Analysis
Nano Banana
- + Expertly captures the 'caricature' art style with exaggerated proportions and clean linework.
- + Creatively integrates all prompt elements into a cohesive scene (hockey arena studio, dog in a jersey with a helmet).
- + Humorous touches like the muscular arm and 'Dog Scores Goal' headline add personality.
- − Moves away from the photographic source, turning the person into a 2D illustration.
- − One hand appears incorrectly shaped/attached to the dog's head.
Seedream 4.5
- + Maintains a strong facial likeness to the original source image while applying some caricature proportions.
- + Successfully includes all requested elements: anchor desk, microphone, dog, and hockey gear.
- + Preserves the realistic lighting and texture of the original face.
- − The 'exaggeration' is limited almost entirely to just a larger head, lacking the humor of Model A.
- − The hands are poorly rendered and too small for the body.
Verdict: Nano Banana interprets the prompt creatively by creating a full 2D caricature scene that feels humorous and thematic, though it loses the realism of the source face. Seedream 4.5 maintains a better likeness and realistic style but the 'caricature' effect is less successful and the anatomy of the hands is significantly distorted. Nano Banana is the winner for better understanding the spirit of a caricature and delivering a more polished, humorous final product.
Victorian Greenhouse Oasis
Text-to-Image“Hyper-photorealistic interior of a lush Victorian glass greenhouse filled with exotic tropical plants, vibrant blooming orchids, tall ferns, colorful butterflies in flight, sunlight filtering through ornate glass roof creating realistic caustics and dew on leaves, intricate iron framework visible, misty atmosphere, 8K masterpiece.”
AI Judge Analysis
Nano Banana
- + Excellent architectural detail in the Victorian iron framework
- + Precise rendering of numerous flower varieties and dense foliage
- + Natural, even lighting that fills the entire structure
- − The 'misty atmosphere' is very subtle compared to Model B
- − Butterflies are a bit static and small within the composition
Seedream 4.5
- + Strong cinematic lighting with dramatic god rays and visible mist
- + Beautifully rendered dew drops and light refractions (caustics)
- + Creative addition of stained glass elements that enhance the Victorian aesthetic
- − The butterfly in the foreground has slightly awkward wing anatomy
- − Shallow depth of field hides some of the 'lush' background detail mentioned in the prompt
Verdict: Nano Banana excels at capturing the sheer scale and architectural complexity of a Victorian greenhouse with incredible foliage density. However, Seedream 4.5 is the winner as it better captures the atmospheric elements of the prompt, specifically the mist, caustics, and dew drops, creating a more magical and visually striking 'masterpiece' feel.
Heroic Super Hero Portrait
Text-to-Image“Hyper-photorealistic full-body portrait of a female superhero standing triumphantly on a New York skyscraper rooftop at golden sunset, wearing a classic modest superhero costume with flowing cape, chest emblem, gloves, and boots in red and blue colors, practical design, short hair, strong determined heroic expression looking into the distance, powerful confident stance with hands on hips and cape billowing dramatically in the wind, detailed urban cityscape background, warm natural sunlight with sharp shadows and fabric highlights, ultra-sharp textures on suit, hair, and concrete, 8K masterpiece, empowering family-friendly style.”
AI Judge Analysis
Nano Banana
- + Excellent facial symmetry and sharp, detailed skin texture
- + High-quality rendering of the costume fabric and stitching
- + Clear, recognizable New York skyline including the Empire State Building
- − The cape physics are a bit stiff compared to Model B
- − The lighting on the character's face feels slightly artificial for a golden hour sunset
Seedream 4.5
- + Beautiful natural golden hour lighting and lens flare effect
- + Dynamic and realistic cape billowing
- + Stronger sense of depth and scale in the urban background
- − Anatomy issues with the left hand (extra/distorted fingers)
- − The costume design leans heavily on existing 'Supergirl' IP rather than a unique 'classic' design
- − The face has slightly less clarity and resolution than Model A
Verdict: Nano Banana produces a cleaner, more technically proficient image with superior facial details and costume textures, though the lighting is a bit flat. Seedream 4.5 captures the 'golden sunset' atmosphere and heroic movement of the cape much more effectively, but it suffers from visible AI artifacts in the hands. Nano Banana is the overall winner for its professional polish and anatomical correctness.
Studio Ghibli Anime Style
Editing“Transform this photo into a Studio Ghibli–inspired illustration. Use soft pastel colors, hand-painted textures, gentle lighting, dreamy backgrounds, and a warm, nostalgic mood”
AI judge analysis unavailable for this challenge.
Intricate Floral Mandala
Text-to-Image“Perfectly symmetrical mandala made entirely of real flowers, petals, leaves, fruits, and seeds in vibrant natural colors, intricate layered patterns with radial symmetry, top-down view on a soft neutral background, hyper-detailed organic textures and subtle shadows, photorealistic, 8K masterpiece.”
AI Judge Analysis
Nano Banana
- + Excellent adherence to the 'perfectly symmetrical' requirement with high mathematical precision.
- + Very sharp rendering of diverse textures, including citrus slices, seeds, and fern leaves.
- + The top-down perspective is perfectly flat as requested, creating a professional flat-lay aesthetic.
- − The lighting is somewhat flat and even, lacking the 'subtle shadows' depth requested in the prompt.
- − The canvas-like texture of the background is a bit noisy relative to the subjects.
Seedream 4.5
- + Beautiful use of lighting and 'subtle shadows' creates a strong sense of three-dimensional depth.
- + Authentic organic layering that feels more like a physical arrangement of objects.
- + Excellent color harmony and smooth, soft neutral background.
- − Fails the 'perfectly symmetrical' requirement, with several mismatched elements and lopsided placements.
- − The top-down perspective is slightly tilted, and the shadows are inconsistent with a centered overhead view.
Verdict: Nano Banana is the clear winner for this specific prompt because it achieved the 'perfectly symmetrical' requirement, which is the core of a mandala, whereas Seedream 4.5 had significant asymmetries in its floral placement. Nano Banana also did a much better job including all requested categories (fruits, seeds, leaves, and flowers) with high clarity and a true top-down perspective.
Neutral Expression to Genuine Smile
Editing{
"action": "image_edit",
"reference": "uploaded neutral portrait",
"change": "Warm genuine Duchenne smile: lips curved up, slight natural teeth, soft eye crinkles, subtle cheek raise",
"details": "Realistic smiling skin (dimples if present, soft cheek shadows), slightly brighter eyes; keep exact eye shape/color/iris",
"preserve_exact": "Face identity/structure, eyes/nose/lips/eyebrows, hair, skin texture/pores/freckles, makeup, clothing, head pose, background, lighting, shadows, framing",
"no_changes": "No face shape change, no new features, no gaze shift, no hair/clothing/lighting/background edits",
"style": "Ultra-photorealistic 8K portrait, sharp face focus, natural soft lighting, realistic skin glow"
}
AI Judge Analysis
Nano Banana
- + Excellent preservation of the original face structure and identity.
- + Natural eye crinkles and cheek raising following the Duchenne smile request.
- + Maintains original skin texture, including freckles and light reflecting off pores.
- − The teeth rendering is slightly less defined compared to Model B.
Seedream 4.5
- + Strong prompt adherence for the Duchenne smile with clear teeth and eye crinkles.
- + Good preservation of background and overall head pose.
- − Slightly smoothing of the skin texture, losing some of the fine pore detail of the original.
- − Subtle shift in the face shape/jawline compared to the source.
Verdict: Both models performed exceptionally well, successfully adding a genuine smiling expression while maintaining the subject's identity. Nano Banana is the winner because it managed to preserve the fine skin texture and microscopic details of the original image more accurately, whereas Seedream 4.5 applied a very subtle smoothing effect to the face.
Golden Hour Stroll
Editing“Add dynamic motion to this photo: make hair blow in the wind, add leaves flying, energetic and lively feel.”
AI Judge Analysis
Nano Banana
- + Excellent source preservation, maintaining the identity and details of the original woman and dog
- + Subtle but effective hair movement that looks natural
- + Added autumn leaves look integrated into the scene
- − The 'lively and energetic' feel is a bit more static compared to the competitor
- − Small digital artifacts around some of the added leaves
Seedream 4.5
- + Strong sense of movement with motion blur on the ground and foreground leaves
- + Dynamic hair wind effect is very pronounced
- + Successfully captured the requested 'energetic and lively' feel
- − Significantly altered the woman's face and original features
- − The dog's face and eyes have changed noticeably from the source image
- − Background elements like the bridge and distant trees have been completely regenerated
Verdict: Nano Banana followed the instructions while perfectly preserving the source image, making it a superior editing tool. Seedream 4.5 creates a more dynamic and aesthetically pleasing 'motion' scene but fails as an editor by completely regenerating the subject's face, the dog, and the background details.
Vintage Cafe Logo
Text-to-Image“Vintage minimalist restaurant logo for "Caffè Florian", retro cloche dome with steam and "Est. 1720" banner, classic typography, warm brown and cream tones, subtle texture on light background, vector emblem style.”
AI Judge Analysis
Nano Banana
- + Perfect circular emblem composition
- + Excellent typography and character rendering
- + Elegant implementation of the steam and cloche details
- − Steam is inside the cloche rather than rising above it
Seedream 4.5
- + Bold, clean vector style
- + Steam is correctly positioned above the cloche
- + Accurate text rendering and banner layout
- − Lacks the cohesive circular border requested for an emblem style
- − The proportions of the cloche are slightly flatter and less elegant
Verdict: Nano Banana creates a more sophisticated and cohesive emblem with better integrated typography and a classic circular frame. Seedream 4.5 is very clean and accurately follows the banner and steam placement, but Nano Banana feels more like a finished 'vintage minimalist' brand logo.
Apollo 11: Journey to Tranquility
Text-to-Image“Create a clean, modern vector infographic poster about the Apollo 11 mission. NASA-inspired palette (navy, white, muted red, light gray). Flat-vector style, crisp lines, consistent iconography, subtle gradients only. Steps (stop at landing): 1. Launch (Saturn Vicon) 2. Earth Orbit (Earth + orbit ring icon) 3. Translunar (trajectory arc icon) 4. Lunar Orbit (Moon + orbit ring icon) 5. Descent (lunar module descending icon) 6. Landing (lunar module on the surface icon) Small supporting elements (minimal text): • Crew strip: three silhouette icons with only last names: Armstrong, Aldrin, Collins. • Landing site marker: Moon pin labeled "Tranquility" only. Layout constraints: generous margins, large readable labels, clean background with subtle stars. Vector-only, print-poster look, high resolution.”
AI Judge Analysis
Nano Banana
- + Excellent text rendering for all steps and names.
- + Highly consistent iconography within rounded containers.
- + Perfect adherence to the flat-vector style with professional layout.
- − The iconography for 'Descent' is nearly identical to 'Lunar Orbit'.
- − Uses glow/outer shadow effects which leans slightly away from 'subtle gradients only'.
Seedream 4.5
- + Clear timeline structure with numbered steps and distinct illustrations.
- + Includes a more detailed and accurate Saturn V and Lunar Module illustration.
- + Follows the color palette accurately.
- − The illustration for 'Descent' appears to be a generic satellite rather than a lunar module.
- − The 'Tranquility' icon at the bottom is disconnected from the main infographic layout.
- − The 'Translunar' icon is just a dashed line ending in space without reaching the moon.
Verdict: Nano Banana is the winner because it provides a more cohesive and professional infographic design with superior text rendering and consistent iconography. While Seedream 4.5 has some more detailed illustrations, its layout is slightly disjointed and it incorrectly depicts the descent stage as a solar-paneled satellite.
Nano Banana
Gemini 2.5 Flash Image is optimized for image understanding and generation, offering a balance of price and performance with fast and efficient image generation and editing capabilities.
Seedream 4.5
ByteDance's latest image generation model unifying text-to-image and image editing in a single architecture, with improved text rendering and 30-40% faster generation than v4.0