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Head to head

Nano Banana 2.1 vs Seedream 5.5

Nano Banana 2.1 wins 57% of 190 direct comparisons against Seedream 5.5.

Both models received the same prompts. Wins and losses count only images judged together in the same call, the same comparisons the leaderboard Elo is fitted from.

Nano Banana 2.1
Google
1199 Elo ±36
Rank #9 of 45 · median 22s per image · 1 refused
90–35–65
wins – ties – losses for Nano Banana 2.1
190 direct comparisons
Elo expectation: Nano Banana 2.1 wins 57%
Seedream 5.5
Bytedance
1148 Elo ±45
Rank #11 of 45 · median 21s per image · 4 refused

By category

CategoryNano Banana 2.1Seedream 5.5Direct record
Anime & Cartoon Style 1294 1337 3–5–6
Architecture & Interiors 1303 1249 11–2–7
Complex Scenes 1194 1117 10–6–4
Ghibli style 1211 1275 5–2–9
Graphic Design 1203 1074 12–2–6
Hands & Anatomy 1251 1128 11–3–6
Photorealistic People & Portraits 1166 1185 9–3–8
Surreal & Creative Prompts 1200 1112 11–3–6
Text in Images 1067 1037 6–9–5
Ultra Hard 1270 1192 12–0–8

By criterion

CriterionNano Banana 2.1Seedream 5.5
Prompt adherence 1157 1024
Technical quality 1130 1157
Artistic merit 1157 1156
Detail execution 1156 1159
Realism & coherence 1138 1191

Side by side

Anime & Cartoon Style An anime-style portrait of a samurai standing under pink cherry blossoms.
An anime-style portrait of a samurai standing under pink cherry blossoms. - Nano Banana 2.1
Nano Banana 2.1 7 / 10
Judge's noteRank 9 of 12: a faithful, attractive illustration with good color control. Its conventional staging and less convincing hand-and-sword interaction prevent it from reaching the stronger group.
An anime-style portrait of a samurai standing under pink cherry blossoms. - Seedream 5.5
Seedream 5.5 10 / 10
Judge's noteRank 1 of 12: the most complete integration of anime styling, convincing construction, expressive composition, and spring color. It reads as finished professional artwork without a conspicuous flaw that meaningfully detracts from the requested image.
Architecture & Interiors An ancient Roman bathhouse interior with accurate architectural details - marble columns, mosaic floors, arched ceilings, and steam rising from pools. Natural light from oculus openings.
An ancient Roman bathhouse interior with accurate architectural details - marble columns, mosaic floors, arched ceilings, and steam rising from pools. Natural light from oculus openings. - Nano Banana 2.1
Nano Banana 2.1 6 / 10
Judge's noteThe bathhouse itself is attractive and substantially fulfills the prompt. Uneven figure realism repeatedly draws attention away from the architecture and lowers the overall result.
An ancient Roman bathhouse interior with accurate architectural details - marble columns, mosaic floors, arched ceilings, and steam rising from pools. Natural light from oculus openings. - Seedream 5.5
Seedream 5.5 9 / 10
Judge's noteThis is the strongest image in the set, combining architectural credibility with excellent material rendering and spatial organization. Its minor ornamental simplifications prevent a flawless score.
Complex Scenes An underwater scene with scuba divers exploring a coral reef alongside colorful fish and a sunken ship.
An underwater scene with scuba divers exploring a coral reef alongside colorful fish and a sunken ship. - Nano Banana 2.1
Nano Banana 2.1 9 / 10
Judge's noteRanked third of twelve, this stands out for cinematic lighting and an exceptionally strong environmental composition. Slightly ambiguous diver overlaps place it behind the two leading images.
An underwater scene with scuba divers exploring a coral reef alongside colorful fish and a sunken ship. - Seedream 5.5
Seedream 5.5 6 / 10
Judge's noteRanked tenth of twelve, this has stronger natural atmosphere than some higher-placed images but substantially weaker prompt coverage. The near-absence of colorful fish and limited marine diversity pull the overall score down despite competent rendering.
Ghibli style A sea creature rising from a stormy ocean near a village. Replicate the visual style of 'Ponyo' by Studio Ghibli, with Miyazaki's fluid water animations and vibrant creatures.
A sea creature rising from a stormy ocean near a village. Replicate the visual style of 'Ponyo' by Studio Ghibli, with Miyazaki's fluid water animations and vibrant creatures. - Nano Banana 2.1
Nano Banana 2.1 8 / 10
Judge's noteThis belongs in the strongest tier because of its imaginative creature design and exceptional color orchestration. More ornamental rendering and several small spatial ambiguities keep it below the two most convincing animated scenes.
A sea creature rising from a stormy ocean near a village. Replicate the visual style of 'Ponyo' by Studio Ghibli, with Miyazaki's fluid water animations and vibrant creatures. - Seedream 5.5
Seedream 5.5 6 / 10
Judge's noteThis is an attractive watercolor interpretation with considerable decorative appeal. The stylistic departure and uncertain creature boundaries keep it in the middle tier despite its strong color and surface treatment.
Graphic Design Instagram post graphic: 'SPRING SALE 30% OFF'. Floral background, pastel colors, elegant serif font style visually integrated.
Instagram post graphic: 'SPRING SALE 30% OFF'. Floral background, pastel colors, elegant serif font style visually integrated. - Nano Banana 2.1
Nano Banana 2.1 9 / 10
Judge's noteRanked 2nd of 12, this stands out for genuinely integrating botanical elements with the typography. Slightly busy letter-and-leaf intersections keep it just below the exceptionally clear leading image.
Instagram post graphic: 'SPRING SALE 30% OFF'. Floral background, pastel colors, elegant serif font style visually integrated. - Seedream 5.5
Seedream 5.5 6 / 10
Judge's noteRanked 8th of 12, this succeeds more as a decorative lifestyle still life than as a focused sale graphic. Its attractive rendering does not fully offset the weaker message hierarchy and inconsistent typographic integration.
Hands & Anatomy Two people high-fiving, with focus on their hands meeting mid-air.
Two people high-fiving, with focus on their hands meeting mid-air. - Nano Banana 2.1
Nano Banana 2.1 8 / 10
Judge's noteRanked 3rd of 12, this combines strong hand emphasis with convincing social energy. Minor overlap ambiguity and bright highlights are its main limitations.
Two people high-fiving, with focus on their hands meeting mid-air. - Seedream 5.5
Seedream 5.5 4 / 10
Judge's noteRanked 12th of 12, this is the least successful interpretation of the requested composition and gesture. Heavy obstruction, ambiguous hand relationships, and weak focal emphasis outweigh its atmospheric lighting.
Photorealistic People & Portraits A black and white close-up portrait of a freckled woman with an intense gaze.
A black and white close-up portrait of a freckled woman with an intense gaze. - Nano Banana 2.1
Nano Banana 2.1 5 / 10
Judge's noteThis ranks twelfth because the most important requested surface detail—the freckled face—is also its largest rendering weakness. The subject and composition are correct, but pervasive texture artifacts substantially reduce its success.
A black and white close-up portrait of a freckled woman with an intense gaze. - Seedream 5.5
Seedream 5.5 10 / 10
Judge's noteThis ranks first for its combination of photographic credibility, precise execution, and complete prompt fulfillment. No conspicuous generation artifacts are visible at the supplied resolution, and the result reads as a finished professional portrait.
Surreal & Creative Prompts A city skyline that forms the shape of musical notes on a staff, created in a stylized graphic design aesthetic with clean architectural lines and dramatic twilight colors.
A city skyline that forms the shape of musical notes on a staff, created in a stylized graphic design aesthetic with clean architectural lines and dramatic twilight colors. - Nano Banana 2.1
Nano Banana 2.1 9 / 10
Judge's noteRanks 2nd of 12 for its exceptional symbolic integration and distinctive graphic design. It narrowly trails the leading image because its crowded infrastructure makes the musical arrangement less immediately legible.
A city skyline that forms the shape of musical notes on a staff, created in a stylized graphic design aesthetic with clean architectural lines and dramatic twilight colors. - Seedream 5.5
Seedream 5.5 6 / 10
Judge's noteRanks 7th of 12 for its originality and polished graphic execution. The absence of actual note-shaped architecture is a substantial prompt shortfall that outweighs its strong atmosphere.
Text in Images A wrinkled white T-shirt with "Carpe Diem" in bold serif font and "Seize The Day" in smaller script below it, modeled on a mannequin, professional product photography with soft-box lighting.
A wrinkled white T-shirt with "Carpe Diem" in bold serif font and "Seize The Day" in smaller script below it, modeled on a mannequin, professional product photography with soft-box lighting. - Nano Banana 2.1
Nano Banana 2.1 9 / 10
Judge's noteThis is an excellent match with clear typography, extensive fabric detail, and controlled lighting. Minor cropping and slightly flat print behavior place it just behind the leading image.
A wrinkled white T-shirt with "Carpe Diem" in bold serif font and "Seize The Day" in smaller script below it, modeled on a mannequin, professional product photography with soft-box lighting. - Seedream 5.5
Seedream 5.5 4 / 10
Judge's noteGood typography and fabric detail are outweighed by the conspicuous human/mannequin mismatch. The image is less usable as coherent product photography than several technically weaker but internally consistent alternatives.
Ultra Hard Photorealistic aerial photograph clearly showing the edge of the Earth from space, capturing realistic curvature, atmosphere, and sunlight reflections
Photorealistic aerial photograph clearly showing the edge of the Earth from space, capturing realistic curvature, atmosphere, and sunlight reflections - Nano Banana 2.1
Nano Banana 2.1 8 / 10
Judge's noteRanked fifth of 12 as a strong, coherent rendering of the requested scene. Its softer contrast and more noticeable optical processing place it below the sharper, more restrained leading entries.
Photorealistic aerial photograph clearly showing the edge of the Earth from space, capturing realistic curvature, atmosphere, and sunlight reflections - Seedream 5.5
Seedream 5.5 4 / 10
Judge's noteRanked last of 12 because the second sun-like source is a fundamental coherence problem for the requested scene. Attractive colors and detailed clouds cannot compensate for that central lighting contradiction.

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