GPT Image 2.5 Flarevs.FLUX 3 Image Klein
Which one is better?
In our own test both are on par. FLUX 3 Image Klein has no arena rating yet. FLUX 3 Image Klein has no API price.
Same prompt, two images
Same task, the first image of each. The task with the biggest difference is preselected.
Result for “Typography and layout”:FLUX 3 Image Klein ahead
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 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source
FLUX 3 Image Klein: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.009000, generated Nov 1, 2026, 8:28 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6
GPT Image 2.5 Flare image SHA 256: 85b17c41b19389cae3ea073ef582e6065a321d741978e772987d22e3ea3e3b08
FLUX 3 Image Klein image SHA 256: b3331460097da628f405817301b99f206142350757be51bee5e406216ef8359f
Infographic
GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source
FLUX 3 Image Klein: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.009000, generated Nov 1, 2026, 8:28 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f
GPT Image 2.5 Flare image SHA 256: bc752abfce1c0d27b73e4084c3e7d82c4c0f71e0e5af97a80f4b24326cc4686e
FLUX 3 Image Klein image SHA 256: 8f6c2d4ea5814181f198e45caf6b561a650145fccf667ecb5cace92c1fc3bbcb
Product photography
GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:53 PM. Source
FLUX 3 Image Klein: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.009000, generated Nov 1, 2026, 8:28 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3
GPT Image 2.5 Flare image SHA 256: 69fedb7d635d1329c461ff1ee9e5cf8384119e218e3b3bdb93b9e11f728335d8
FLUX 3 Image Klein image SHA 256: bafab00e86d3de8b29c6390b162e99291c84878c546246a95b5d47c6fe352fb9
Typography and layout
GPT Image 2.5 Flare: openai, 1024x1024, quality high, n=1, generated Sep 28, 2026, 8:52 PM. Source
FLUX 3 Image Klein: openrouter, aspect ratio 1:1, resolution 1K, n=1, seed=provider random, actual cost $0.009000, generated Nov 1, 2026, 8:28 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419
GPT Image 2.5 Flare image SHA 256: cc90d54a99e1bad9e0cc8e4196746fb1d56a2fdd2a9ee101dbbf270ef5e4b6a8
FLUX 3 Image Klein image SHA 256: 8f3f8cc9a1ab3c037f81a05bb3eec4e9a0129bad649347c4f40dc30c2870c0aa
The numbers at a glance
GPT Image 2.5 Flare
Rank 2 of 22
FLUX 3 Image Klein
not in the arena
GPT Image 2.5 Flare
Rank 32 of 74
FLUX 3 Image Klein
Rank 9 of 74
GPT Image 2.5 Flare
expensive
FLUX 3 Image Klein
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 Flare
- Subscription
- No OpenAI subscription includes this model. Through other providers from ≈ €6.39 a month (ElevenLabs Starter, with limited credits). 61 plans in Germany.
- Via API
- $0.21 per image, 100 images $21.07.
FLUX 3 Image Klein
- Subscription
- n/a No plan in Germany names exactly this model.
- Via API
- No API price known. Access: API, local.
- License
- Open weights.
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 2.5 Flare | FLUX 3 Image Klein |
|---|---|---|
| Ratings | ||
| Arena ratingfrom votes by users, higher is better | 1,401 | n/a |
| Arena rank | Rank 2 of 22 | n/a |
| Arena votesmore votes, a safer rating | 39,218 | n/a |
| GraduallyBenchour own rating, 0 to 100 | 59 | 71 |
| GraduallyBench by task | ||
| Typography and layoutLegible text, hierarchy, and composition | 48 | 86 |
| Product photographyMaterials, reflections, and fine details | 38 | 43 |
| Character and detailAnatomy, clothing, and spatial consistency | 82 | 82 |
| InfographicNumbers, labels, and visual organization | 66 | 74 |
| API price | ||
| Per imagelower is better | $0.21 | n/a |
| 100 images | $21.07 | n/a |
| Profile | ||
| Released | Sep 8, 2026 | Oct 15, 2026 |
| Weightsopen means: runs locally | proprietary | open |
| Access | API | API, local |
| Parameters | not published | 5.6 billion |
| Largest output | not consistently published | 4K |
| Plans in Germanynaming exactly this model | 61 | n/a |
API prices for one image at 1,024 × 1,024 pixels according to Artificial Analysis.
Sources: GPT Image 2.5 Flare model source (verified Sep 22, 2026) · FLUX 3 Image Klein 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 Flare and FLUX 3 Image Klein from the same arena and category. Older model versions are not used as substitutes.
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