FLUX.2 Klein 9Bvs.GPT Image 2.5 Flare

Which one is better?

In our own test both are on par. In the arena, GPT Image 2.5 Flare leads. GPT Image 2.5 Flare costs 14 times as much per image.

Test images

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

FLUX.2 Klein 9B: Infographic, first image from the fixed test run — FLUX.2 Klein 9B42 out of 100

GPT Image 2.5 Flare: Infographic, first image from the fixed test run — GPT Image 2.5 Flare91 out of 100

Result for “Infographic”:GPT Image 2.5 Flare 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

FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1587849924, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source

GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source

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

FLUX.2 Klein 9B image SHA 256: 84eceab680e59de6b9d4e68b3c21f6515ce093ff7d110992049e847570dd565f

GPT Image 2.5 Flare image SHA 256: 85b17c41b19389cae3ea073ef582e6065a321d741978e772987d22e3ea3e3b08

Infographic

FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1082231541, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source

GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source

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

FLUX.2 Klein 9B image SHA 256: 1d2eb263ca5a25794a88df7bb04f5c13e10ed9a289371d1dcc7ed6d6e0a297e2

GPT Image 2.5 Flare image SHA 256: bc752abfce1c0d27b73e4084c3e7d82c4c0f71e0e5af97a80f4b24326cc4686e

Product photography

FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1388538280, estimated cost $0.006291, generated Aug 14, 2026, 1:39 PM. Source

GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source

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

FLUX.2 Klein 9B image SHA 256: e7208f19ccfb9b810b9648cb1861797b7155ad91933d1660059236cef413ebe0

GPT Image 2.5 Flare image SHA 256: 69fedb7d635d1329c461ff1ee9e5cf8384119e218e3b3bdb93b9e11f728335d8

Typography and layout

FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1340991019, estimated cost $0.006291, generated Aug 14, 2026, 2:41 PM. Source

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

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

FLUX.2 Klein 9B image SHA 256: c5f23870e70f2245d24a3689f2579ceb770e5edf8c3c89b7d6ed7ae138f262f6

GPT Image 2.5 Flare image SHA 256: cc90d54a99e1bad9e0cc8e4196746fb1d56a2fdd2a9ee101dbbf270ef5e4b6a8

The numbers at a glance

Arena ratingfrom votes by users · higher is better

1,070

FLUX.2 Klein 9B

Rank 20 of 21

1,401

GPT Image 2.5 Flare

Rank 2 of 21

GraduallyBenchour own rating, 0 to 100 · higher is better

FLUX.2 Klein 9B

Rank 62 of 108

GPT Image 2.5 Flare

Rank 18 of 108

Price per imagedollars through the API · lower is better

$0.015

FLUX.2 Klein 9B

cheap

$0.21

GPT Image 2.5 Flare

expensive

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.

FLUX.2 Klein 9B

Subscription: n/a No plan in Germany names exactly this model.
Via API: $0.015 per image, 100 images $1.50.
License: Open weights, Weights released under the FLUX Non-Commercial License.

GPT Image 2.5 Flare

Subscription: No OpenAI subscription includes this model. Through other providers from ≈ €6.34 a month (ElevenLabs Starter, with limited credits). 61 plans in Germany.
Via API: $0.21 per image, 100 images $21.07.

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 3, 2026 · API prices 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	FLUX.2 Klein 9B	GPT Image 2.5 Flare
Ratings
Arena ratingfrom votes by users, higher is better	1,070	1,401
Arena rank	Rank 20 of 21	Rank 2 of 21
Arena votesmore votes, a safer rating	150,695	39,218
GraduallyBenchour own rating, 0 to 100	50	72
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition	32	64
Product photographyMaterials, reflections, and fine details	87	69
Character and detailAnatomy, clothing, and spatial consistency	39	63
InfographicNumbers, labels, and visual organization	42	91
API price
Per imagelower is better	$0.015	$0.21
100 images	$1.50	$21.07
Profile
Released	January 2026	Sep 8, 2026
Weightsopen means: runs locally	openWeights released under the FLUX Non-Commercial License	proprietary
Access	API, local	API
Parameters	9 billion	not published
Largest output	4 Megapixel	not consistently published
Plans in Germanynaming exactly this model	n/a	61

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

Sources: FLUX.2 Klein 9B model source, status source (verified Sep 24, 2026) · GPT Image 2.5 Flare model source (verified Sep 22, 2026)

Arena ratings by category

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

Arena rating per categoryfrom votes by users · higher is betterFLUX.2 Klein 9BGPT Image 2.5 Flare

Text to Image Arena9301,207ahead

Image Editing Arena1,0161,183ahead

Text to Image: 3D modeling1,0781,378ahead

Text to Image: Art1,0791,387ahead

Text to Image: Cartoon1,0641,431ahead

Text to Image: Commercial design1,0701,387ahead

Text to Image: Overall1,0701,401ahead

Text to Image: Photorealism1,0911,415ahead

Text to Image: Portraits1,0921,439ahead

Text to Image: Text rendering1,0581,435ahead

Image Editing: Multi-image editing1,2121,477ahead

Image Editing: Overall1,2241,482ahead

Artificial Analysis from Nov 3, 2026 · LMArena from Oct 28, 2026

All individual values with sources

Rating	FLUX.2 Klein 9B	GPT Image 2.5 Flare	Source
Text to Image Arena	930	1,207	Artificial AnalysisRetrieved Nov 3, 2026
Image Editing Arena	1,016	1,183	Artificial AnalysisRetrieved Nov 3, 2026
Text to Image: 3D modeling	1,078	1,378	LMArenaRetrieved Oct 28, 2026
Text to Image: Art	1,079	1,387	LMArenaRetrieved Oct 28, 2026
Text to Image: Cartoon	1,064	1,431	LMArenaRetrieved Oct 28, 2026
Text to Image: Commercial design	1,070	1,387	LMArenaRetrieved Oct 28, 2026
Text to Image: Overall	1,070	1,401	LMArenaRetrieved Oct 28, 2026
Text to Image: Photorealism	1,091	1,415	LMArenaRetrieved Oct 28, 2026
Text to Image: Portraits	1,092	1,439	LMArenaRetrieved Oct 28, 2026
Text to Image: Text rendering	1,058	1,435	LMArenaRetrieved Oct 28, 2026
Image Editing: Multi-image editing	1,212	1,477	LMArenaRetrieved Oct 28, 2026
Image Editing: Overall	1,224	1,482	LMArenaRetrieved Oct 28, 2026

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Predecessor and successor

No predecessor recorded for FLUX.2 Klein 9B
FLUX.2 Klein 9B has no successor yet
No predecessor recorded for GPT Image 2.5 Flare
GPT Image 2.5 Flare has no successor yet

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