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Seedream 5.5 vs Nano Banana Pro: same prompts, 10 images, one clear price gap

Nov 13, 2026 · 8 min read · By the Pizyn team

Seedream 5.5 costs 4 credits a picture. Nano Banana Pro costs 24. Six times the price should buy visibly better images — so we gave both models the same five prompts, word for word, and kept every first output: a product shot, a portrait, a text-heavy poster, a fantasy landscape and an interior. The honest result is that the quality gap is small and the price gap is the story. One model wins on value, the other on resolution — and the poster round produced the most interesting miss of the day.

A floating castle above a sea of clouds at sunset with waterfalls and airships, generated with Seedream 5.5

How this test ran

Five prompts, each sent verbatim to both models on November 13, 2026, through this studio. First outputs kept, no re-rolls, no cherry-picking. Seedream 5.5 ran at 1K (4 credits, $0.02 of provider cost); Nano Banana Pro ran at 2K (24 credits, $0.14) — 2K is its lowest tier, there is no 1K option, and that asymmetry is part of the comparison rather than a flaw in it: Pro's entry price is 24 credits. Ten generations cost $0.80 in provider fees. Seedream answered in roughly 20–35 seconds per image; Nano Banana Pro took roughly 35–95 seconds.

Both models are already reviewed on their own terms here — the Seedream 5.5 review measured its transparent PNGs pixel by pixel — and our model guide places them in the wider field. This test asks the narrower question: given the same brief, what does 6x the price actually buy?

Round 1 · Product photography

"Studio product photograph of a matte black perfume bottle with a gold cap and a minimal cream label reading 'NOIR', standing on a wet slate surface, soft window light, water droplets on the glass, luxury advertising style, photorealistic"

Matte black perfume bottle with a gold cap and a cream NOIR label on wet slate, generated with Seedream 5.5 — **Seedream 5.5 · 1K · 4 credits.** Moody and finished: the label reads "NOIR / EAU DE PARFUM / BY LUMIÈRE", all spelled correctly, with droplets on the glass and a dark berry branch for atmosphere. The two extra label lines were the model's own invention — correct French, but not in the brief.

Matte black perfume bottle with a gold cap and a cream NOIR label on wet slate, generated with Nano Banana Pro — **Nano Banana Pro · 2K · 24 credits.** Brighter and cleaner: a cylindrical bottle, the label says only "NOIR", droplets beaded on the cap and glass, soft window light. Less atmosphere, more product — the shot a catalogue would actually use.

Verdict: tie. Both spelled the label perfectly and both delivered the wet slate and droplets. Seedream styled the scene; Pro centred the product. Pick by mood, not by quality.

Round 2 · Portrait

"Editorial portrait photograph of a woman in her thirties with short silver hair and a rust-colored wool coat, standing in a sunlit botanical garden, soft golden hour light, shallow depth of field, photorealistic"

Woman with short silver hair in a rust wool coat in a botanical garden greenhouse, generated with Seedream 5.5 — **Seedream 5.5 · 1K · 4 credits.** A close editorial crop: short silver hair, rust coat, greenhouse glass and foliage behind her, natural skin with real texture. The most magazine-like frame in the test.

Woman with short silver hair in a rust coat on a garden path at golden hour, generated with Nano Banana Pro — **Nano Banana Pro · 2K · 24 credits.** A wider three-quarter shot on a garden path, golden-hour backlight through the trees, the rust coat over an olive turtleneck. The environment does more work here; the face is equally convincing.

Verdict: tie. Same woman, same brief, different framing instincts — Seedream goes close, Pro goes wide. Neither fumbled the hair, the coat or the light.

Round 3 · Poster with text

"Minimal cafe poster design, warm cream background, a ceramic cup of flat white coffee in the center, large bold text at the top reading 'SLOW MORNINGS', small text below reading 'freshly roasted, est. 2019', flat illustration style, clean typography"

Cafe poster reading SLOW MORNINGS with a flat white cup, generated with Seedream 5.5 — **Seedream 5.5 · 1K · 4 credits.** A full-bleed poster: both lines spelled correctly, latte-art heart, leaf sprigs, a napkin and a book. The book reads "Good Coffee Brighter Days" — unprompted text, spelled right, but invented. Rich, busy, charming.

Minimal cafe poster reading SLOW MORNINGS with a flat coffee cup illustration, generated with Nano Banana Pro — **Nano Banana Pro · 2K · 24 credits.** Every word spelled correctly and the layout is the cleanest in the test — but the model rendered the poster as a sheet on a grey background, a mockup, instead of filling the frame. Correct typography, wrong framing for a poster file.

Verdict: Seedream 5.5, narrowly. Both models spelled every word right, which is the hard part. Seedream's extra text is a flaw you can crop or ignore; Pro's mockup framing means the file needs a crop before it is a poster at all. If you print posters, Seedream's output is closer to finished.

Round 4 · Fantasy landscape

"Epic fantasy landscape, a floating castle above a sea of clouds at sunset, waterfalls spilling off the edges into the sky, tiny airships circling the towers, painterly digital art, rich warm colors, highly detailed"

Floating castle above clouds at sunset with waterfalls and balloon airships, generated with Seedream 5.5 — **Seedream 5.5 · 1K · 4 credits.** A whole world: the castle, waterfalls off the edges, balloon airships, smaller floating islands, two tiny figures on a cliff and a red phoenix banner. Busy in the best way — it reads like a book cover.

Floating island castle at sunset with waterfalls and sailing airships, generated with Nano Banana Pro — **Nano Banana Pro · 2K · 24 credits.** One grand castle on one island, waterfalls, a fleet of sailing-ship airships and a purple-orange sunset that does half the work. More painterly, more dramatic, more composed.

Verdict: Nano Banana Pro, narrowly. Both delivered every element in the brief. Pro's composition is the more confident painting; Seedream's is the richer scene. For a cover, Pro. For a story bible, Seedream.

Round 5 · Interior

"Modern living room interior, floor-to-ceiling windows overlooking a pine forest, boucle cream sofa, walnut coffee table, warm afternoon sunlight casting long shadows, architectural photography, photorealistic"

Modern living room with a boucle cream sofa, walnut coffee table and floor-to-ceiling windows over a pine forest, generated with Seedream 5.5 — **Seedream 5.5 · 1K · 4 credits.** Warm and liveable: the boucle sofa, a solid walnut table, long afternoon shadows across the rug, pines through full-height glass. Every element in the brief is present and correct.

Double-height living room with a glass wall over a pine forest and a boucle sofa, generated with Nano Banana Pro — **Nano Banana Pro · 2K · 24 credits.** The more architectural shot: a double-height glass wall makes the forest the room's main feature, boucle sofa and a lighter wood table. The coffee table reads pale rather than walnut — the one small miss on the brief.

Verdict: tie. Seedream is the cosier room, Pro the more dramatic one. Pro's table missed the walnut note; Seedream missed nothing. A draw.

The scoreboard

Product photography	Tie — both nailed the label
Portrait	Tie — different framing, equal quality
Poster with text	Seedream 5.5 — full-bleed poster vs mockup framing
Fantasy landscape	Nano Banana Pro — more composed painting
Interior	Tie — Seedream cosier, Pro more dramatic
Speed	Seedream 5.5 — ~20–35s vs ~35–95s per image
Price per image	Seedream 5.5 — 4 credits vs 24 credits
Max resolution	Nano Banana Pro — 4K tier; Seedream tops out at 2K

Three ties, one round each. That is the honest shape of this comparison: at the level of "did it draw what I asked, well", these models are peers. The differences that matter are not in the pixels — they are in the price, the speed and the ceiling.

What the 6x price gap actually buys

Resolution. Pro renders natively at 2K and offers a true 4K tier (40 credits); Seedream tops out at 2K (6 credits). If the image goes to print, a billboard or a hard crop, Pro's 4K is the only option of the two. For screens, 2K is already more than enough, and Seedream's 2K costs 6 credits against Pro's 24.

Reasoning and references. Pro thinks about a brief before it draws — it is the stronger pick for infographics, labeled diagrams and multi-reference scenes, and it takes up to 14 reference images per edit against Seedream's 10. Seedream counters with the feature Pro lacks entirely: native transparent backgrounds, a PNG with a real alpha channel straight from the model, at no extra cost.

Editing economics. A Seedream edit is 5 credits at 1K/1.5K (8 at 2K), plus 2 credits per extra reference. A Pro edit costs the same as its generation — 24 credits at 2K, 40 at 4K — with no per-reference surcharge. Iterate a look ten times and the arithmetic is brutal: roughly 50 credits on Seedream, 240 on Pro. Our character-consistency test found both models hold a face through reference edits; the difference is what each round costs.

What each image costs

Live studio rates, checked against the manifest before writing. Full pack pricing is on the pricing page; a credit is about $0.01 in pack terms.

Seedream 5.5 — 4 credits at 1K and 1.5K, 6 at 2K. Edits 5/5/8 credits, +2 per extra reference (up to 10).
Nano Banana Pro — 24 credits at 2K, 40 at 4K. Edits cost the same as generations, no per-reference surcharge (up to 14 references).

The whole ten-image test cost 140 credits. Six Seedream images cost less than a single Nano Banana Pro 2K final — which is why the sensible workflow is not either/or: draft and explore on Seedream, then render the winner on Pro when the job needs 2K or 4K.

Where this test is limited

One output per prompt. A single run per model per scene measures a typical result, not a model's best — re-roll either prompt and the framing, the styling and the small misses change. 1K vs 2K. The resolution gap is real and it favours Pro on fine detail; the comparison is fair as a price test (these are the entry tiers) and less fair as a pure quality test. No edits, no 4K. This test is text-to-image only; edit quality is covered in our consistency guide, and Pro's 4K tier gets its own deep dive on the Nano Banana Pro page. Five scenes are not a benchmark. Artificial Analysis ranks Seedream 5.5 #10 of 111 on text-to-image and Nano Banana Pro #14 (read November 13, 2026) — close, and consistent with what we saw here.

Verdict: draft on Seedream, finish on Pro

Seedream 5.5 is the value pick and it is not close: equal quality in three of five rounds, a win on the poster, six times cheaper, roughly twice as fast, and the only one of the two with native transparency. Nano Banana Pro earns its price when the output needs to be big — true 4K for print — or when the brief is a diagram, an infographic or a scene built from many references. Run the search on Seedream 5.5 at 4 credits a frame; when one frame is the keeper, re-render it on Nano Banana Pro at 2K or 4K. That is the workflow this test actually supports — not a winner, but a division of labour.

Frequently asked questions

Is Seedream 5.5 or Nano Banana Pro better?

For most jobs, Seedream 5.5 is the better buy: in our five-prompt test it matched Nano Banana Pro in three rounds, won the poster round, costs 4 credits against 24, and runs roughly twice as fast. Nano Banana Pro is better when you need true 4K output, a labeled diagram or infographic, or a scene built from many reference images (up to 14). Draft on Seedream, finish on Pro.

How much cheaper is Seedream 5.5 than Nano Banana Pro?

Six times cheaper per image at the entry tier: 4 credits for Seedream 5.5 at 1K (6 at 2K) against 24 credits for Nano Banana Pro at 2K (40 at 4K). Edits widen the gap further — a Seedream edit is 5 credits at 1K, a Pro edit is 24 at 2K. Six Seedream images cost less than one Pro 2K final.

Which model is better at text in images?

Both spelled every word correctly in our poster test — "SLOW MORNINGS" and "freshly roasted, est. 2019" came out clean on both models, as did the "NOIR" product label. Seedream added unprompted text (a book title) to its poster; Nano Banana Pro kept the layout cleaner but framed the poster as a mockup. For text-heavy work, check the output before publishing either way.

Can Nano Banana Pro do 4K?

Yes — true 4K is its headline feature, at 40 credits per image. Seedream 5.5 tops out at 2K (6 credits). 4K matters for print, large displays and hard crops; for anything viewed on a screen, 2K is already more than enough.

Which is faster, Seedream 5.5 or Nano Banana Pro?

Seedream 5.5, by roughly 2x: in this test it answered in about 20–35 seconds per image, while Nano Banana Pro took about 35–95 seconds. Both are fast enough for interactive work; the gap matters when you are iterating through dozens of drafts.

About the author

Written by the Pizyn Studio team. We build and operate this 33-model AI image studio, and every frame in this comparison was generated on November 13, 2026 with Seedream 5.5 and Nano Banana Pro through the same pipeline our users run — the same five prompts, first outputs kept, at the prices listed, including the poster round, which we kept because the miss was instructive. Prices and model details are checked against the live studio on the date above. Spot an error? Email support@pizyn.com and we will correct it.

Try the models in this guide

Seedream 5.5 · Nano Banana Pro · Seedream 5.5 review · Character consistency guide · All models