GPT Image 1.5vs.FLUX.2 Klein 9B
Which one is better?
In our own test both are on par. In the arena, GPT Image 1.5 leads. Both are in the lower half there, though. GPT Image 1.5 costs 8.9 times as much per image.
Test images
Same task, the first image of each. The task with the biggest difference is preselected.
Result for “Character and detail”:GPT Image 1.5 ahead
What the rating looks at: Anatomy, clothing, and spatial consistency.
“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
GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source
FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1587849924, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6
GPT Image 1.5 image SHA 256: 0dff52ccd39400ac66ac8870c9ea937512ff1474688e70118688f420c38c2296
FLUX.2 Klein 9B image SHA 256: 84eceab680e59de6b9d4e68b3c21f6515ce093ff7d110992049e847570dd565f
Infographic
GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source
FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1082231541, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f
GPT Image 1.5 image SHA 256: 1c9ff59c32621c8b48b002dacb0ae66487262280c7c0a5b3d6456c81b248ebe9
FLUX.2 Klein 9B image SHA 256: 1d2eb263ca5a25794a88df7bb04f5c13e10ed9a289371d1dcc7ed6d6e0a297e2
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.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1388538280, estimated cost $0.006291, generated Aug 14, 2026, 1:39 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3
GPT Image 1.5 image SHA 256: 67cfa2f324447027ceb5f82e9446d40a1395b46ce425890a74606b4d97731cf6
FLUX.2 Klein 9B image SHA 256: e7208f19ccfb9b810b9648cb1861797b7155ad91933d1660059236cef413ebe0
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.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1340991019, estimated cost $0.006291, generated Aug 14, 2026, 2:41 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419
GPT Image 1.5 image SHA 256: 6a4cec86850fd371b65274198e2bf630b3cf36a096f9fb953d4bfe17c3222ebe
FLUX.2 Klein 9B image SHA 256: c5f23870e70f2245d24a3689f2579ceb770e5edf8c3c89b7d6ed7ae138f262f6
The numbers at a glance
GPT Image 1.5
Rank 13 of 21
FLUX.2 Klein 9B
Rank 20 of 21
GPT Image 1.5
Rank 29 of 108
FLUX.2 Klein 9B
Rank 62 of 108
GPT Image 1.5
expensive
FLUX.2 Klein 9B
cheap
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.
GPT Image 1.5
- Subscription
- No OpenAI subscription includes this model. Through other providers from ≈ €6.36 a month (ElevenLabs Starter, with limited credits). 42 plans in Germany.
- Via API
- $0.13 per image, 100 images $13.30.
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.
Subscriptions only count plans that name exactly this model. Subscription prices include VAT, API prices are in dollars.
Arena rating (LMArena) from Nov 6, 2026 · GraduallyBench from Nov 3, 2026 · API prices from Nov 6, 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 | GPT Image 1.5 | FLUX.2 Klein 9B |
|---|---|---|
| Ratings | ||
| Arena ratingfrom votes by users, higher is better | 1,236 | 1,070 |
| Arena rank | Rank 13 of 21 | Rank 20 of 21 |
| Arena votesmore votes, a safer rating | 173,798 | 150,686 |
| GraduallyBenchour own rating, 0 to 100 | 68 | 50 |
| GraduallyBench by task | ||
| Typography and layoutLegible text, hierarchy, and composition | 60 | 32 |
| Product photographyMaterials, reflections, and fine details | 52 | 87 |
| Character and detailAnatomy, clothing, and spatial consistency | 89 | 39 |
| InfographicNumbers, labels, and visual organization | 72 | 42 |
| API price | ||
| Per imagelower is better | $0.13 | $0.015 |
| 100 images | $13.30 | $1.50 |
| Profile | ||
| Released | December 2025 | January 2026 |
| Weightsopen means: runs locally | proprietary | openWeights released under the FLUX Non-Commercial License |
| 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 | 9 billion |
| Largest output | 1,536 × 1,024 pixels | 4 Megapixel |
| Plans in Germanynaming exactly this model | 42 | n/a |
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.2 Klein 9B model source, status source (verified Sep 24, 2026)
Arena ratings by category
From blind votes on LMArena. “Ahead” means the lead is clear.
Artificial Analysis from Nov 6, 2026 · LMArena from Nov 6, 2026
All individual values with sources
| Rating | GPT Image 1.5 | FLUX.2 Klein 9B | Source |
|---|---|---|---|
| Text to Image Arena | 1,124 | 932 | Artificial AnalysisRetrieved Nov 6, 2026 |
| Image Editing Arena | 1,116 | 1,013 | Artificial AnalysisRetrieved Nov 6, 2026 |
| Text to Image: 3D modeling | 1,218 | 1,079 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Art | 1,225 | 1,079 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Cartoon | 1,244 | 1,064 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Commercial design | 1,238 | 1,070 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Overall | 1,236 | 1,070 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Photorealism | 1,247 | 1,091 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Portraits | 1,259 | 1,092 | LMArenaRetrieved Nov 6, 2026 |
| Text to Image: Text rendering | 1,251 | 1,058 | LMArenaRetrieved Nov 6, 2026 |
| Image Editing: Multi-image editing | 1,342 | 1,212 | LMArenaRetrieved Nov 6, 2026 |
| Image Editing: Overall | 1,368 | 1,224 | LMArenaRetrieved Nov 6, 2026 |
Published specialist tests
This pair shares 7 results from published research benchmarks.
WISE Verified from Aug 26, 2026
All individual values with sources
| Rating | GPT Image 1.5 | FLUX.2 Klein 9B | Source |
|---|---|---|---|
| WISE Verified overall | 83% | 44% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE culture | 89% | 49% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE time | 69% | 39% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE space | 88% | 55% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE biology | 80% | 38% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE physics | 76% | 48% | WISE VerifiedRetrieved Aug 26, 2026 |
| WISE chemistry | 78% | 23% | WISE VerifiedRetrieved Aug 26, 2026 |
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