FLUX.2 [dev] Flash vs Seedream 4.5
Head-to-head across 7 challenges
FLUX.2 [dev] Flash
16.7%
win rate
Ties
33.3%
Seedream 4.5
50.0%
win rate
Challenge Results
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 [dev] Flash
- + Excellent depiction of motion blur in the background cars.
- + Highly realistic skin texture and age details on the man's hands and face.
- + The wet pavement and reflections feel grounded and authentic.
- − The man's hands are mangled and anatomically incorrect around the brake cables.
- − The bicycle geometry is slightly warped, particularly the front wheel and fork area.
Seedream 4.5
- + Stronger narrative composition with the man looking at the camera.
- + More atmospheric raining effect with visible streaks and light trails.
- + Clearer depiction of 'repairing' with a visible wrench tool.
- − The wrench is disconnected from the hand and floating curiously.
- − The background cars and light trails look more like a digital painting than a 50mm lens photo.
- − The man's skin looks somewhat smoother and less natural compared to the other model.
Verdict: Both models captured the mood well, but FLUX.2 [dev] Flash produced a significantly more realistic photo-like texture, especially in the skin and the wet road. While Seedream 4.5 had a more compelling 'candid' look with the subject's gaze, it suffered from more obvious AI artifacts like a floating wrench and a slightly stylised background that contradicted the 'no stylization' requirement.
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 [dev] Flash
- + Perfect adherence to the spatial requirements of the prompt.
- + Highly realistic textures on the glass, book, and wooden table.
- + Very natural lighting and depth of field that follows the 'soft window light' instruction.
- − The plant in the background is a bit generic, though it fits the prompt.
Seedream 4.5
- + Vibrant colors and strong contrast with sunlight streaks.
- + Includes all requested elements: cube, sphere, book, and plant.
- − The blue sphere is clipping through the glass wall of the cube, a significant physical error.
- − The cube is rendered more like a solid glass block rather than a hollow container, making the sphere appear embedded.
- − The lighting is harsh and direct rather than the requested 'soft window light'.
Verdict: FLUX.2 [dev] Flash produced a photorealistic and physically coherent image where the sphere is clearly inside a hollow glass cube. In contrast, Seedream 4.5 failed the spatial logic, showing the blue sphere clipping through the glass wall and ignoring the request for soft lighting in favor of harsh, direct sunlight.
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 [dev] Flash
- + Perfect text rendering of 'JAPAN' and 'SUSHI'.
- + Clean isometric perspective with a professional wooden diorama base.
- + High-quality textures on the fish and rice that suggest a miniature clay/PBR look.
- − The sushi roll construction is a bit nonsensical with fish draped over a roll.
Seedream 4.5
- + Accurate variety of sushi including nigiri and maki rolls.
- + Good 45-degree isometric composition.
- + Includes a flag icon on a small pole as a creative touch.
- − The text 'SUSHI' is slightly warped and not perfectly bold/clean.
- − The diorama base texture is a bit grainy and less 'refined' than requested.
Verdict: FLUX.2 [dev] Flash delivered a much cleaner and more professional graphic, with perfect typography and a very high-quality 3D render feel. Seedream 4.5 handled the sushi variety better, but the text quality and the texture of the diorama base were not as refined as the FLUX.2 output.
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.
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 [dev] Flash
- + Excellent adherence to the 'full-body' shot request including feet and a clear ground plane.
- + Very high level of detail in the suit texture and fabric of the cape.
- + Natural looking golden hour lighting that integrates the character well into the environment.
- − The hair length is slightly longer than the 'short hair' requested, leaning more towards a bob.
- − The chest emblem is slightly distorted/asymmetrical.
Seedream 4.5
- + Strong, cinematic lighting with a glowing rim light effect that enhances the 'triumphant' feel.
- + Better interpretation of 'short hair' as requested in the prompt.
- + The cape billowing has a very dynamic and dramatic shape.
- − The lower legs and feet appear slightly awkward in their placement and perspective on the ledge.
- − Noticeable anatomy issues on the hands, particularly the fingers on the hips which look unnatural.
- − The suit design is a bit less 'modest' with the high-cut red brief section compared to Model A.
Verdict: FLUX.2 [dev] Flash produces a more grounded and anatomically correct image with superior texture work, especially in the suit and facial features. While Seedream 4.5 captures the 'short hair' and dramatic lighting better, it suffers from noticeable artifacts in the hands and a less convincing connection between the character and the rooftop.
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 [dev] Flash
- + Excellent adherence to the 'perfectly symmetrical' requirement.
- + Rich variety of textures including seeds, fruits, and layered petals.
- + Consistent, high-quality lighting and depth across the entire composition.
- − The arrangement feels slightly more like a digital illustration than a loose physical flat-lay.
Seedream 4.5
- + Strong photorealistic qualities with very natural lighting and soft shadows.
- + Organic feel that looks like a real physical arrangement of botanicals.
- − Fails the 'perfectly symmetrical' prompt, with many elements misaligned or unique to one side.
- − Lower complexity in layering compared to the other model.
Verdict: FLUX.2 [dev] Flash followed the prompt much more accurately, delivering a complex and perfectly symmetrical mandala with a wide variety of botanical elements. While Seedream 4.5 had a very tactile and photorealistic quality, its lack of true radial symmetry makes it less successful for this specific prompt.
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 [dev] Flash
- + Captures all requested icons with more complex, detailed renderings.
- + Correctly identifies the astronaut names (Armstrong, Aldrin, Collins).
- + Uses a rich navy and white palette that feels highly thematic.
- − The layout is cluttered and lacks a clear logical flow between steps.
- − Text rendering contains several gibberish errors (e.g., 'Sataurr Iccon').
- − Includes duplicate labels for 'Descent' and 'Landing' in a confusing arrangement.
Seedream 4.5
- + Exceptional adherence to the 'flat-vector' and 'infographic' request with clean horizontal flow.
- + Perfectly legible text and numbering for all six requested steps.
- + Superior composition that feels like a professional, modern infographic.
- − The 'Descent' icon (step 5) is a generic satellite rather than a lunar module descending.
- − Missing the specific 'Apollo 11' title in favor of a general 'NASA' header.
Verdict: Seedream 4.5 is the clear winner for its superior understanding of infographic design principles, providing a clean, logical horizontal flow with perfect text legibility. While FLUX.2 [dev] Flash included more detailed lunar module icons, its layout was chaotic and the text was plagued by typical AI spelling artifacts.
FLUX.2 [dev] Flash
Fast distilled version of Black Forest Labs' FLUX.2 [dev] optimized for speed and cost efficiency.
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