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GPT Image 2.5 Sunburstvs.Grok Imagine Image 1.0

Which one is better?

In our own test both are on par. Grok Imagine Image 1.0 has no arena rating yet. Grok Imagine Image 1.0 has no API price.

Same prompt, two images

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

GPT Image 2.5 Sunburst: Typography and layout, first image from the fixed test run
GPT Image 2.5 Sunburst48 out of 100
Grok Imagine Image 1.0: Typography and layout, first image from the fixed test run
Grok Imagine Image 1.073 out of 100

Result for “Typography and layout”:Grok Imagine Image 1.0 ahead

Prompt given to both modelsCreate a square editorial poster for an imaginary night train called MONDFALTER. Show the exact German headline MONDFALTER and the exact subline BERLIN NACH LISSABON. Use a restrained midnight-blue and warm-cream palette, one stylized moth, strong Swiss-grid typography, generous negative space, and no additional words or logos.

What the rating looks at: Legible text, hierarchy, and composition.

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

Test protocol of the images

Both models receive the same archived prompt in exactly one request, and the first result counts. 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

GPT Image 2.5 Sunburst: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:51 PM. Source

Grok Imagine Image 1.0: fal, aspect ratio 1:1, n=1, seed=provider random, resolution 1K, estimated cost $0.020000, generated Nov 1, 2026, 9:30 PM. Source

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

GPT Image 2.5 Sunburst image SHA 256: 2bcd5e2358dbf9e2f11336ebf6c4a4a15e0a9a10261dd74378d40985ac68ec6d

Grok Imagine Image 1.0 image SHA 256: f0a1722dd70365a05d18f1872dcf5761f358e13dca81e6ceafca69d17f658412

Infographic

GPT Image 2.5 Sunburst: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:52 PM. Source

Grok Imagine Image 1.0: fal, aspect ratio 1:1, n=1, seed=provider random, resolution 1K, estimated cost $0.020000, generated Nov 1, 2026, 9:31 PM. Source

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

GPT Image 2.5 Sunburst image SHA 256: 7dab94e5588be73aefe08f23f9d56ced4e2ddb2b29f754db41b057025cf34847

Grok Imagine Image 1.0 image SHA 256: 7dd25385835faf743c6e97b5a50ebcf5926cf94d862425177c25d8b27281ac8d

Product photography

GPT Image 2.5 Sunburst: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:51 PM. Source

Grok Imagine Image 1.0: fal, aspect ratio 1:1, n=1, seed=provider random, resolution 1K, estimated cost $0.020000, generated Nov 1, 2026, 9:30 PM. Source

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

GPT Image 2.5 Sunburst image SHA 256: c648276704e06f7925f2325e8ffff0d9d0a9bd6c5bb4866785abac92ce97ff9a

Grok Imagine Image 1.0 image SHA 256: 95c5d4be59e6c115257f2414c513efd79bf7fd9ac69965ec04677eda2ec5a27a

Typography and layout

GPT Image 2.5 Sunburst: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:50 PM. Source

Grok Imagine Image 1.0: fal, aspect ratio 1:1, n=1, seed=provider random, resolution 1K, estimated cost $0.020000, generated Nov 1, 2026, 9:30 PM. Source

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

GPT Image 2.5 Sunburst image SHA 256: fd6a3767ba8253869cb94d5346f025541dac924c2190df2c37b366b182986cf8

Grok Imagine Image 1.0 image SHA 256: ab6dfd89aec95ebe7cfd2f3cacb4fbd66123306647c78d621d5c8c6325f3d7c5

The numbers at a glance

Arena ratingfrom votes by users · higher is better
1,427

GPT Image 2.5 Sunburst

Rank 1 of 22

n/a

Grok Imagine Image 1.0

not in the arena

GraduallyBenchour own rating, 0 to 100 · higher is better
77

GPT Image 2.5 Sunburst

Rank 4 of 74

76

Grok Imagine Image 1.0

Rank 5 of 74

Price per imagedollars through the API · lower is better
$0.21

GPT Image 2.5 Sunburst

expensive

n/a

Grok Imagine Image 1.0

no API price

Ranks among the 22 image models with an arena rating and the 74 with a GraduallyBench run; prices compared with 28 models with an API price.

GPT Image 2.5 Sunburst

Subscription
No OpenAI subscription includes this model. Through other providers from ≈ €6.39 a month (ElevenLabs Starter, with limited credits). 62 plans in Germany.
Via API
$0.21 per image, 100 images $21.07.

Grok Imagine Image 1.0

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

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

Arena rating (LMArena) from Oct 28, 2026 · GraduallyBench from Nov 1, 2026 · API prices from Oct 28, 2026 · Subscription database from Sep 29, 2026 (34 days old)

All data side by side

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

KennzahlGPT Image 2.5 SunburstGrok Imagine Image 1.0
Ratings
Arena ratingfrom votes by users, higher is better1,427n/a
Arena rankRank 1 of 22n/a
Arena votesmore votes, a safer rating40,323n/a
GraduallyBenchour own rating, 0 to 1007776
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition4873
Product photographyMaterials, reflections, and fine details9389
Character and detailAnatomy, clothing, and spatial consistency7457
InfographicNumbers, labels, and visual organization9185
API price
Per imagelower is better$0.21n/a
100 images$21.07n/a
Profile
ReleasedSep 8, 2026n/a
Weightsopen means: runs locallyproprietaryunknown
AccessAPIAPI
Parametersnot publishednot published
Largest output3,840 × 2,160 pixelsnot consistently published
Plans in Germanynaming exactly this model62n/a

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

Sources: GPT Image 2.5 Sunburst model source (verified Sep 24, 2026) · Grok Imagine Image 1.0 model 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 GPT Image 2.5 Sunburst and Grok Imagine Image 1.0 from the same arena and category. Older model versions are not used as substitutes.

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