Hy Image 3.5 Previewvs.Seedream 4.5

Which one is better?

In our own test both are on par. Neither is in the arena. Neither has an API price.

Test images

Same task, the first image of each. The task with the biggest difference is preselected.

Hy Image 3.5 Preview: Infographic, first image from the fixed test run — Hy Image 3.5 Preview71 out of 100

Seedream 4.5: Infographic, first image from the fixed test run — Seedream 4.527 out of 100

Result for “Infographic”:Hy Image 3.5 Preview ahead

Prompt given to both modelsCreate a square German infographic titled SO FUNKTIONIERT PHOTOSYNTHESE. Show exactly four numbered steps in this order: 1 LICHT, 2 WASSER, 3 CO₂, 4 ZUCKER + SAUERSTOFF. Use a clean editorial science style with one plant cross-section, simple arrows, high contrast, legible labels, and no other text.

What the rating looks at: Numbers, labels, and visual organization.

“Ahead”: better in all three rating rounds. “Slightly ahead”: a higher value, but not in every round.

Test protocol of the images

Each test attempt uses the same archived prompt and one request. The first output of that attempt counts. Repeats after technical test failures are disclosed for the affected images. Files are normalized to 1,024 × 1,024 pixels without cropping. Provider resolution, randomness, quality tier and prompt processing can still differ. The images are a practical visual test, not a reconstruction of the arena configuration.

Character and detail

Hy Image 3.5 Preview: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.024000, generated Nov 2, 2026, 3:01 PM. Source

Seedream 4.5: fal, requested native 2048x2048 square, n=1, seed=607017308, estimated cost $0.040000, source 2048x2048, stored 1024x1024 (Lanczos3 downscale), generated Nov 2, 2026, 2:50 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6

Hy Image 3.5 Preview image SHA 256: 03261ac75753d1e9cab07ba1311aa4697e6b2c93af575780d40fd2b1d718cb70

Seedream 4.5 image SHA 256: 614d5b810be9f7cc54c999fb930e5bb1a7a5b58f7211a3b71aa92e83a360cf78

Infographic

Hy Image 3.5 Preview: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.024000, generated Nov 2, 2026, 3:02 PM. Source

Seedream 4.5: fal, requested native 2048x2048 square, n=1, seed=467481828, estimated cost $0.040000, source 2048x2048, stored 1024x1024 (Lanczos3 downscale), generated Nov 2, 2026, 2:51 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f

Hy Image 3.5 Preview image SHA 256: 953e4cae6dbff16ccb03179c9681395c41cd69c129c2656c0f134cf5058e1210

Seedream 4.5 image SHA 256: ec1e2be1080670edf050cff00a094ff471c1b480a11a3922cf8c25f0ef0f6a5e

Product photography

Hy Image 3.5 Preview: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.024000, generated Nov 2, 2026, 3:01 PM. Source

Seedream 4.5: fal, requested native 2048x2048 square, n=1, seed=1880157282, estimated cost $0.040000, source 2048x2048, stored 1024x1024 (Lanczos3 downscale), generated Nov 2, 2026, 2:50 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3

Hy Image 3.5 Preview image SHA 256: 8d1dba97e0e067970403a0632fd53ad20a566a96b2564f712c42855299bec14e

Seedream 4.5 image SHA 256: 48a36dede8c680fa8e2231ac33a95b1417dcded96ad753c98218cc78ed96a65b

Typography and layout

Hy Image 3.5 Preview: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.024000, generated Nov 2, 2026, 3:01 PM. Source

Seedream 4.5: fal, requested native 2048x2048 square, n=1, seed=775629027, estimated cost $0.040000, source 2048x2048, stored 1024x1024 (Lanczos3 downscale), generated Nov 2, 2026, 2:50 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419

Hy Image 3.5 Preview image SHA 256: e4eed56fff7004829fd7249f72597f0201bc4e0be033ccfad8987d8458585135

Seedream 4.5 image SHA 256: 62d4e5b0b3c9ca5a55952dc2c5aca878ed687c76f302ad632136bd3e6bee3872

The numbers at a glance

Arena ratingfrom votes by users · higher is better

n/a

Hy Image 3.5 Preview

not in the arena

n/a

Seedream 4.5

not in the arena

GraduallyBenchour own rating, 0 to 100 · higher is better

Hy Image 3.5 Preview

Rank 66 of 108

Seedream 4.5

Rank 64 of 108

Price per imagedollars through the API · lower is better

n/a

Hy Image 3.5 Preview

no API price

n/a

Seedream 4.5

no API price

Ranks among the 21 image models with an arena rating and the 108 with a GraduallyBench run; prices compared with 28 models with an API price.

Hy Image 3.5 Preview

Subscription: n/a No plan in Germany names exactly this model.
Via API: No API price known. Access: API.
Weights: unknown.

Seedream 4.5

Subscription: No ByteDance / Volcengine subscription includes this model. Through other providers from ≈ €6.36 a month (ElevenLabs Starter, with limited credits). 39 plans in Germany.
Via API: No API price known. Access: API, Web app.
Weights: unknown.

Subscriptions only count plans that name exactly this model. Subscription prices include VAT, API prices are in dollars.

GraduallyBench from Nov 3, 2026 · Subscription database from Sep 29, 2026 (38 days old)

All data side by side

The better value is bold. For ratings only when the gap is clear.

Kennzahl	Hy Image 3.5 Preview	Seedream 4.5
Ratings
Arena ratingfrom votes by users, higher is better	n/a	n/a
Arena rank	n/a	n/a
Arena votesmore votes, a safer rating	n/a	n/a
GraduallyBenchour own rating, 0 to 100	45	48
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition	45	84
Product photographyMaterials, reflections, and fine details	15	44
Character and detailAnatomy, clothing, and spatial consistency	50	37
InfographicNumbers, labels, and visual organization	71	27
API price
Per imagelower is better	n/a	n/a
100 images	n/a	n/a
Profile
Released	Sep 22, 2026	n/a
Weightsopen means: runs locally	unknown	unknown
Lifecycle	Public preview; T2I, I2I, and multi-turn editing	Still-listed T2I/I2I model ID; Ark marks it as pending shutdown without giving a date in the reviewed source
Access	API	API, Web app
Parameters	not published	not published
Largest output	not consistently published	not consistently published
Plans in Germanynaming exactly this model	n/a	39

API prices for one image at 1,024 × 1,024 pixels according to Artificial Analysis.

Sources: Hy Image 3.5 Preview model source, status source (verified Nov 1, 2026) · Seedream 4.5 model source, status source (verified Nov 1, 2026)

Arena ratings by category

From blind votes on LMArena. “Ahead” means the lead is clear.

No shared arena score in the stored snapshot

The stored benchmark database contains no measurement for Hy Image 3.5 Preview and Seedream 4.5 from the same arena and category. Older model versions are not used as substitutes.

More comparisons

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