FLUX.2 [flex] vs Stable Diffusion 3.5 Large
Head-to-head across 10 challenges
FLUX.2 [flex]
78.8%
win rate
Ties
3.0%
Stable Diffusion 3.5 Large
18.2%
win rate
Challenge Results
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
FLUX.2 [flex]
- + Perfect adherence to the spatial relationships in the prompt
- + Clean glass rendering with realistic refractions
- + Excellent lighting and photographic composition
- − The blue sphere is quite large compared to the description of a 'small' sphere
Stable Diffusion 3.5 Large
- + Realistic details on the wooden table and book texture
- + Accurate sphere color and reflection
- − Failed the spatial prompt: the book is inside/under the cube and the sphere is on top of the book
- − The plant is not clearly 'behind' the cube but rather in the distant background
- − The cube edges appear to clip through the book
Verdict: FLUX.2 [flex] followed every detail of the prompt accurately, placing the sphere inside the cube and the book on top. Stable Diffusion 3.5 Large failed the spatial instructions by putting the book inside the cube and the sphere on top of the book, creating a less coherent scene.
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
FLUX.2 [flex]
- + Excellent depiction of motion blur from passing cars as requested.
- + Highly realistic skin textures and fine details on the hands and face.
- + Superior bokeh and shallow depth of field effects.
- − The structural integrity of the bike frame is slightly warped near the man's hands.
- − The sidewalk wetness looks a bit more like a glossy floor than natural outdoor pavement.
Stable Diffusion 3.5 Large
- + Great atmosphere with very visible rain droplets falling.
- + Good composition that feels like a wide-angle street candid.
- + Excellent reflections on the wet pavement.
- − The man's skin texture looks overly crinkled and slightly 'waxy' in the light.
- − Failed to include the requested motion blur for passing cars; the vehicle in the background is static.
- − Significant anatomical issues with the man's feet/shoes which blend into each other.
Verdict: FLUX.2 [flex] adhered much better to the specific technical requests of the prompt, successfully incorporating motion blur and high-quality skin textures. While Stable Diffusion 3.5 Large captured a beautiful rainy atmosphere, it failed on the specific motion blur requirement and suffered from noticeable anatomical distortions in the lower half of the subject.
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
FLUX.2 [flex]
- + Excellent structure that logically arranges text sections below color-coded food photos.
- + Clean and legible typography with clear alignment of prices.
- + Professional color coordination between section headers and the grid accents.
- − The food photos in the grid are somewhat repetitive, featuring two identical pizzas.
- − Text, while legible, consists of nonsensical placeholder words.
Stable Diffusion 3.5 Large
- + High-contrast, bold typography that creates a strong modern visual impact.
- + Creative grid layout using side columns for food photography.
- + High-quality, appetizing food photography with vibrant colors.
- − Poor text legibility with numerous spelling errors and garbled characters in the smaller fonts.
- − Disconnected layout where the food photos don't align clearly with the menu sections.
Verdict: FLUX.2 [flex] produced a much more functional and professional menu design that adheres to the minimalist professional layout requested, with clearly defined sections and prices. Stable Diffusion 3.5 Large has a striking visual style but fails on utility due to messy text rendering and a chaotic layout that makes the menu difficult to read.
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
FLUX.2 [flex]
- + Perfect adherence to text placement and content instructions
- + Elegant, clean isometric composition with a true solid background
- + Excellent 3D toy-like texture on the sushi and garnish
- − The diorama base is very simple and blends into the background slightly
Stable Diffusion 3.5 Large
- + Rich, vibrant colors and complex miniature details
- + Good interpretation of the 'diorama' request with the wooden block
- + High visual appeal and creative sushi designs
- − Failed the text placement instructions (put text on flags instead of top-center)
- − Includes excessive garnish and elements despite the 'minimal' request
- − Background has a subtle gradient rather than being a solid color
Verdict: FLUX.2 [flex] followed every specific instruction including the exact text placement, font weights, and the 'minimal' aesthetic. While Stable Diffusion 3.5 Large created a more visually complex and 'cute' scene, it failed the specific layout constraints and over-decorated the scene against the prompt's request for minimalism.
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
FLUX.2 [flex]
- + Excellent adherence to the prompt, including all four specific animals with clear distinctions.
- + Superior background detail with clearly defined god rays and a realistic misty meadow.
- + Very high resolution and texture clarity on the fur and individual blades of grass.
- − The kitten and puppy look slightly composited onto the grass rather than being deeply embedded in it.
- − The butterflies look a bit like stickers rather than being integrated into the lighting.
Stable Diffusion 3.5 Large
- + Captures a very joyful, high-energy 'tumbling' motion as requested.
- + Excellent integration of subject and environment with soft, dreamy bokeh.
- + The lighting and sparkles create a very magical and cohesive atmosphere.
- − Fails to render a tabby kitten, instead showing what looks like a second fox-like creature or orange kitten.
- − The bunny has a butterfly sitting directly on its ear in a way that looks slightly unnatural.
- − The background is more blurred and lacks the '8K masterpiece' level of fine landscape detail found in Model A.
Verdict: FLUX.2 [flex] is the winner for its superior prompt adherence, correctly identifying and rendering all four specific baby animals while maintaining incredible sharpness across the entire frame. While Stable Diffusion 3.5 Large captures the 'joyful tumbling' vibe very well, it misses the tabby kitten requirement and lacks the crisp environmental detail of its competitor.
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
FLUX.2 [flex]
- + Exceptional clarity and sharpness in the botanical details, especially the dew on the leaves.
- + Highly symmetrical and aesthetically pleasing composition with a clear focal path.
- + Intricate and clean rendering of the Victorian ironwork patterns.
- − The lighting feels a bit more like a studio set than natural caustic light filtering through glass.
- − Butterflies appear somewhat static and flat compared to the lush environment.
Stable Diffusion 3.5 Large
- + Superb atmosphere with realistic light rays (volumetric lighting) and misty depth.
- + The architecture looks more authentic to a historic glasshouse with complex structural layering.
- + The placement of plants and butterflies feels more organic and less like a planned garden bed.
- − Overall image is slightly softer/fuzzier compared to the crispness of Model A.
- − Some butterflies have distorted shapes or lack detail at a distance.
Verdict: FLUX.2 [flex] produces a vibrantly colored masterpiece with incredible detail on individual flower petals and dew drops, making it visually striking. However, Stable Diffusion 3.5 Large captures the 'misty atmosphere' and 'sunlight filtering' much more effectively, creating a believable and immersive environment that feels like a real Victorian conservatory. Model A is preferred for its technical clarity, while Model B is more successful at capturing the specific mood and lighting requested.
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
FLUX.2 [flex]
- + Perfect adherence to the 'hands on hips' and 'full-body' prompt instructions.
- + Highly realistic skin textures and natural-looking short hair.
- + Stronger composition with a clear sense of scale and grounding on the rooftop.
- − The costume texture looks slightly more like athletic wear than traditional comic book material.
Stable Diffusion 3.5 Large
- + Vibrant colors and a metallic sheen on the costume that feels very heroic.
- + Includes iconic New York landmarks like the Empire State Building more clearly in the background.
- − Failed to follow the 'hands on hips' instruction, placing arms at the sides instead.
- − Significant anatomy and lighting issues where the boots meet the platform, making the character appear to float.
- − The face has a slightly 'plastic' or airbrushed quality compared to the background.
Verdict: FLUX.2 [flex] followed all prompt instructions perfectly, including the specific pose and full-body framing, resulting in a grounded and believable image. While Stable Diffusion 3.5 Large captured a great superhero aesthetic, it failed on the specific pose requested and had noticeable technical flaws in the character's contact with the ground.
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
FLUX.2 [flex]
- + Expertly captures the 'organic texture' requested with realistic leaf veins and fruit skins.
- + Shows superior adherence to the 'layered' prompt, with elements physically overlapping in a convincing way.
- + The lighting and subtle shadows create a strong sense of depth and realism.
- − The symmetry is slightly imperfect on the outer edges with the berry clusters.
Stable Diffusion 3.5 Large
- + Exceptional geometric symmetry and clean composition.
- + Includes a wide variety of specific objects like almonds, orange slices, and berries.
- + Very vibrant and colorful with a clean, high-contrast look.
- − The petals and center look more like digital illustrations or plastic rather than 'real flowers'.
- − Missing the subtle shadows and organic feel, resulting in a flatter, less photorealistic appearance.
Verdict: FLUX.2 [flex] wins because it successfully captured the 'photorealistic' and 'organic texture' requirements of the prompt, making the mandala look like it was physically constructed from real botanical specimens. While Stable Diffusion 3.5 Large has better mathematical symmetry and a wider variety of fruit, its central flower looks like a digital rendering, failing to meet the 'real flowers' instruction as effectively as FLUX.2 [flex].
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
FLUX.2 [flex]
- + Excellent adherence to the 'Caffè Florian' spelling.
- + Perfectly minimalist vector emblem style with clean lines.
- + Properly integrated 'Est. 1720' banner as requested.
- − The white space around the logo is very large, making the emblem feel small.
- − The texture on the background is almost imperceptibly subtle.
Stable Diffusion 3.5 Large
- + Strong 'vintage' feel with noticeable paper texture and corner flourishes.
- + Elegant typography for the 'Est. 1720' section.
- − Added an extra 'e' to the name, spelling it 'Cafféé'.
- − The cloche graphic is poorly formed and looks disjointed.
- − The steam elements are chunky and less refined than Model A.
Verdict: FLUX.2 [flex] produced a much cleaner and professional logo that followed the spelling instructions perfectly. While Stable Diffusion 3.5 Large captured the 'vintage' texture better, it failed on the text spelling and the cloche dome graphic was awkwardly composed.
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
FLUX.2 [flex]
- + Excellent adherence to the infographics format with clear, legible text.
- + Correctly follows the requested 6-step sequence with logical iconography.
- + Clean, professional flat-vector aesthetic that matches the 'modern' requirement.
- − The layout stops at step 5 'Descent' (missing the final 'Landing' step from the text).
- − Minor spatial confusion with the Lunar Orbit graphic appearing after the Translunar graphic.
Stable Diffusion 3.5 Large
- + Detailed textures on the planetary bodies.
- + Captures the requested navy and muted red palette well.
- − Fails completely on text legibility, displaying 'gibberish' characters.
- − Incorrectly depicts a Space Shuttle instead of the Saturn V rocket requested for the Apollo 11 mission.
- − The layout is chaotic and does not follow the requested step-by-step structure.
Verdict: FLUX.2 [flex] successfully creates a usable, professional infographic with crisp vector lines and perfectly legible text that follows the mission steps. In contrast, Stable Diffusion 3.5 Large fails to follow the structure, produces illegible text, and incorrectly includes a Space Shuttle, which is historically inaccurate for the Apollo 11 prompt.
FLUX.2 [flex]
Black Forest Labs' precision image generation model with maximum control, reliable text rendering, and complete creative control supporting up to 4MP output
Stable Diffusion 3.5 Large
Stability AI's 8.1-billion parameter Multimodal Diffusion Transformer (MMDiT) text-to-image model featuring improved image quality, typography, complex prompt understanding, and resource-efficiency