FLUX.2 Klein 9Bvs.Runway Gen-4 Image
Which one is better?
In our own test both are on par. Runway Gen-4 Image has no arena rating yet. Runway Gen-4 Image 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 “Product photography”:FLUX.2 Klein 9B ahead
What the rating looks at: Materials, reflections, and fine details.
“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
FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1587849924, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source
Runway Gen-4 Image: manual, 1:1, one request, first output (first top-left candidate of native batch), exact UI model Runway Gen-4 Image, provider-default random seed, native resolution provider default, fast mode not offered, no reference images, no selected effects, default content settings, source UI file Firefly_Create a square cinematic full-body portrait of a fictional bicycle courier waiting u 715099.png, source 1080x1080, stored 1024x1024 (Lanczos3 downscale), generated Nov 1, 2026, 10:33 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6
FLUX.2 Klein 9B image SHA 256: 84eceab680e59de6b9d4e68b3c21f6515ce093ff7d110992049e847570dd565f
Runway Gen-4 Image image SHA 256: 1235971dc0ffbe1e82ce305c9e7608d10a9b604697ec359a332cd4f2d931db71
Infographic
FLUX.2 Klein 9B: fal, requested 1024x1024, n=1, seed=1082231541, estimated cost $0.006291, generated Aug 14, 2026, 1:52 PM. Source
Runway Gen-4 Image: manual, 1:1, one request, first output (first top-left candidate of native batch), exact UI model Runway Gen-4 Image, provider-default random seed, native resolution provider default, fast mode not offered, no reference images, no selected effects, default content settings, source UI file Firefly_Create a square German infographic titled SO FUNKTIONIERT PHOTOSYNTHESE. Show exactly 715099.png, source 1080x1080, stored 1024x1024 (Lanczos3 downscale), generated Nov 1, 2026, 10:33 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f
FLUX.2 Klein 9B image SHA 256: 1d2eb263ca5a25794a88df7bb04f5c13e10ed9a289371d1dcc7ed6d6e0a297e2
Runway Gen-4 Image image SHA 256: 13955a0ff71a8e54cde4d84a78ace5dba2bc64b8df79c939bffabca22620480c
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
Runway Gen-4 Image: manual, 1:1, one request, first output (first top-left candidate of native batch), exact UI model Runway Gen-4 Image, provider-default random seed, native resolution provider default, fast mode not offered, no reference images, no selected effects, default content settings, source UI file Firefly_Create a square premium product photograph of a brushed titanium wristwatch standing 715099.png, source 1080x1080, stored 1024x1024 (Lanczos3 downscale), generated Nov 1, 2026, 10:31 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3
FLUX.2 Klein 9B image SHA 256: e7208f19ccfb9b810b9648cb1861797b7155ad91933d1660059236cef413ebe0
Runway Gen-4 Image image SHA 256: 24a4b7e7c9ac88d5e5c7a508aca6c7de29c4ca9e55c0d17623005dbe3e6aaadd
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
Runway Gen-4 Image: manual, 1:1, one request, first output (first top-left candidate of native batch), exact UI model Runway Gen-4 Image, provider-default random seed, native resolution provider default, fast mode not offered, no reference images, no selected effects, default content settings, source UI file Firefly_Create a square editorial poster for an imaginary night train called MONDFALTER. Show 715099.png, source 1080x1080, stored 1024x1024 (Lanczos3 downscale), generated Nov 1, 2026, 10:31 PM. Source
Protocol gradually-image-comparison-v1. Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419
FLUX.2 Klein 9B image SHA 256: c5f23870e70f2245d24a3689f2579ceb770e5edf8c3c89b7d6ed7ae138f262f6
Runway Gen-4 Image image SHA 256: 73ca9e031f19143e8227ccfb5d651cd72eed23184d7cf7b980890310d55f7a8d
The numbers at a glance
FLUX.2 Klein 9B
Rank 21 of 22
Runway Gen-4 Image
not in the arena
FLUX.2 Klein 9B
Rank 50 of 74
Runway Gen-4 Image
Rank 61 of 74
FLUX.2 Klein 9B
cheap
Runway Gen-4 Image
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.
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.
Runway Gen-4 Image
- Subscription
- No Runway subscription includes this model. Through other providers from ≈ €6.39 a month (ElevenLabs Starter, with limited credits). 19 plans in Germany.
- Via API
- No API price known. Access: API, Web app.
- 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.
| Kennzahl | FLUX.2 Klein 9B | Runway Gen-4 Image |
|---|---|---|
| Ratings | ||
| Arena ratingfrom votes by users, higher is better | 1,070 | n/a |
| Arena rank | Rank 21 of 22 | n/a |
| Arena votesmore votes, a safer rating | 150,695 | n/a |
| GraduallyBenchour own rating, 0 to 100 | 45 | 25 |
| GraduallyBench by task | ||
| Typography and layoutLegible text, hierarchy, and composition | 22 | 32 |
| Product photographyMaterials, reflections, and fine details | 72 | 20 |
| Character and detailAnatomy, clothing, and spatial consistency | 59 | 22 |
| InfographicNumbers, labels, and visual organization | 26 | 27 |
| API price | ||
| Per imagelower is better | $0.015 | n/a |
| 100 images | $1.50 | n/a |
| Profile | ||
| Released | January 2026 | n/a |
| Weightsopen means: runs locally | openWeights released under the FLUX Non-Commercial License | unknown |
| Access | API, local | API, Web app |
| Parameters | 9 billion | not published |
| Largest output | 4 Megapixel | not consistently published |
| Plans in Germanynaming exactly this model | n/a | 19 |
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) · Runway Gen-4 Image 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 FLUX.2 Klein 9B and Runway Gen-4 Image from the same arena and category. Older model versions are not used as substitutes.
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