GPT Image 1.5vs.FLUX.1 [dev]

Which one is better?

In our own test, GPT Image 1.5 leads. FLUX.1 [dev] has no arena rating yet. FLUX.1 [dev] has no API price.

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

GPT Image 1.5: Typography and layout, first image from the fixed test run — GPT Image 1.558 out of 100

FLUX.1 [dev]: Typography and layout, first image from the fixed test run — FLUX.1 [dev]7 out of 100

Result for “Typography and layout”:GPT Image 1.5 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 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source

FLUX.1 [dev]: fal, requested 1024x1024, n=1, seed=1386633789, estimated cost $0.025000, generated Nov 1, 2026, 9:00 PM. Source

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

GPT Image 1.5 image SHA 256: 0dff52ccd39400ac66ac8870c9ea937512ff1474688e70118688f420c38c2296

FLUX.1 [dev] image SHA 256: 8cc425497844ab30bdb5f4b32b613219d01f1f21289d68fc198bb5980a3c6465

Infographic

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source

FLUX.1 [dev]: fal, requested 1024x1024, n=1, seed=1094286267, estimated cost $0.025000, generated Nov 1, 2026, 9:00 PM. Source

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

GPT Image 1.5 image SHA 256: 1c9ff59c32621c8b48b002dacb0ae66487262280c7c0a5b3d6456c81b248ebe9

FLUX.1 [dev] image SHA 256: 3d5c50031e545a82fe0617e724937b960d6e77c8371795f99fdf8037a2de8e9c

Product photography

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:16 PM. Source

FLUX.1 [dev]: fal, requested 1024x1024, n=1, seed=1029917942, estimated cost $0.025000, generated Nov 1, 2026, 8:59 PM. Source

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

GPT Image 1.5 image SHA 256: 67cfa2f324447027ceb5f82e9446d40a1395b46ce425890a74606b4d97731cf6

FLUX.1 [dev] image SHA 256: 2932ee8c5af8a92655a9a9c4ad9ff782d366a51b9dad5553d84fe241d084d5c0

Typography and layout

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 1:59 PM. Source

FLUX.1 [dev]: fal, requested 1024x1024, n=1, seed=1184329997, estimated cost $0.025000, generated Nov 1, 2026, 8:59 PM. Source

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

GPT Image 1.5 image SHA 256: 6a4cec86850fd371b65274198e2bf630b3cf36a096f9fb953d4bfe17c3222ebe

FLUX.1 [dev] image SHA 256: 5a33abcfb19aa0d6d544ad7beb0ce59f51382a9418b5420edcc7aa553d578382

The numbers at a glance

Arena ratingfrom votes by users · higher is better

1,236

GPT Image 1.5

Rank 13 of 22

n/a

FLUX.1 [dev]

not in the arena

GraduallyBenchour own rating, 0 to 100 · higher is better

GPT Image 1.5

Rank 43 of 74

FLUX.1 [dev]

Rank 59 of 74

Price per imagedollars through the API · lower is better

$0.13

GPT Image 1.5

expensive

n/a

FLUX.1 [dev]

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 1.5

Subscription: No OpenAI subscription includes this model. Through other providers from ≈ €6.39 a month (ElevenLabs Starter, with limited credits). 42 plans in Germany.
Via API: $0.13 per image, 100 images $13.30.

FLUX.1 [dev]

Subscription: No Black Forest Labs subscription includes this model. Through other providers from ≈ €9.59 a month (Krea Basic, with limited credits). 6 plans in Germany.
Via API: No API price known. Access: API, local.
License: Open weights, Older T2I checkpoint under a non-commercial license; hosted BFL API remains documented.

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.

Kennzahl	GPT Image 1.5	FLUX.1 [dev]
Ratings
Arena ratingfrom votes by users, higher is better	1,236	n/a
Arena rank	Rank 13 of 22	n/a
Arena votesmore votes, a safer rating	174,012	n/a
GraduallyBenchour own rating, 0 to 100	54	29
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition	58	7
Product photographyMaterials, reflections, and fine details	38	40
Character and detailAnatomy, clothing, and spatial consistency	64	40
InfographicNumbers, labels, and visual organization	56	27
API price
Per imagelower is better	$0.13	n/a
100 images	$13.30	n/a
Profile
Released	December 2025	n/a
Weightsopen means: runs locally	proprietary	openOlder T2I checkpoint under a non-commercial license; hosted BFL API remains documented
Lifecycle	Marked as deprecated by OpenAI; removed from the API on December 1, 2026	no notice
Access	API, Web app	API, local
Parameters	not published	12 billion
Largest output	1,536 × 1,024 pixels	not consistently published
Plans in Germanynaming exactly this model	42	6

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

Sources: GPT Image 1.5 model source, status source (verified Aug 15, 2026) · FLUX.1 [dev] 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 GPT Image 1.5 and FLUX.1 [dev] from the same arena and category. Older model versions are not used as substitutes.

Compare another matchup

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More matchups

Compare GPT Image 1.5 and FLUX.1 [dev] with other important image models.

View the complete image model comparison

Same prompt, two images

The numbers at a glance

GPT Image 1.5

FLUX.1 [dev]

All data side by side

Arena ratings by category

No shared arena score in the stored snapshot

Compare another matchup

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