FLUX 3 Image Klein vs FLUX 3 Image
FLUX 3 Image Klein is the 5.6 billion parameter, open-weights model Black Forest Labs released on 15 October 2026; FLUX 3 Image is the full hosted model from 1 October. Both ran the same twelve prompts through fal at about one megapixel: FLUX 3 Image on 8 October with prompt expansion off, Klein on 22 October with prompt expansion on, its default.
Anvisha Pai, Co-founder & CEO, Voyager
Which to use
Klein, for most work. On our prompts it matched FLUX 3 Image on the poster, the infographic and the five-object composition, and it made the full product edit, green body and brass handle, where FLUX 3 Image only changed the handle. It answered in about 3 seconds against FLUX 3 Image's 26, and costs $0.009 a 1K image on fal against $0.048, read on 22 October and 8 October 2026; fal calls Klein's price planned. FLUX 3 Image wins the chart, with every value printed on a correct axis where Klein's axis is scrambled, and its logo mark is closer to the brief. Klein's weights are also yours to run, free for companies under $5 million in annual revenue. One run per prompt is a fair first look, not a ranking.
Side by side, measured
| FLUX 3 Image Klein | FLUX 3 Image | |
|---|---|---|
| Vendor | Black Forest Labs | Black Forest Labs |
| Released | 2026-10-15 | 2026-10-01 |
| Price | $0.009 per 1k image via fal | $0.048 per 1k image, about 1 megapixel via BFL API |
| Seconds per image | 1 to 8 | 21 to 112 |
| 12 pictures cost | $0.108 | $0.288 |
| Sizes | Any width and height from 256 to 4096 pixels, or a preset |
Seconds and cost are from our own runs of the same 12 prompts through each model.
The same 12 prompts, FLUX 3 Image Klein against FLUX 3 Image
One try each, nothing re-rolled or retouched, generated by us. FLUX 3 Image Klein is on the left, FLUX 3 Image on the right. Every prompt has its own page with the whole roster.
Text in an image
Every model on this prompt →Both set all three lines correctly with nothing added, each as a two-colour risograph poster.
›What we asked for
A concert poster that reads 'MODA SUMMER SESSIONS' in large bold type, with the subtitle 'Friday 12 June, 8pm, Roundhouse' and a smaller line 'Tickets at the door'. Risograph style, two colours, tangerine and navy, grainy ink texture.
Product on white
Every model on this prompt →
›What we asked for
Studio product photograph of a matte black ceramic pour-over coffee dripper on a seamless white background, soft top light, subtle contact shadow, centred, catalogue style.
Face and hands
Every model on this prompt →
›What we asked for
Close-up portrait of a woman in her 40s with short grey hair, laughing, holding a red ceramic mug with both hands, natural window light, 85mm lens, shallow depth of field.
Logo mark
Every model on this prompt →Both spelled the wordmark. FLUX 3 Image's icon reads as a chain link; Klein's is a thin link with a spike through it.
›What we asked for
A flat vector logo mark for a bicycle repair shop called 'Spoke & Chain': a single-colour icon combining a chain link and a wheel spoke, with the wordmark below in a geometric sans-serif, black on white.
Busy scene
Every model on this prompt →
›What we asked for
A crowded Saturday farmers market seen from slightly above: at least twelve stalls with striped awnings, shoppers carrying tote bags, a dog on a leash, crates of oranges, a musician with a guitar, bunting overhead, late morning light.
Specific art style
Every model on this prompt →
›What we asked for
A lighthouse on a rocky cliff during a storm, in the style of a Japanese ukiyo-e woodblock print, with visible wood grain texture, flat colour areas and a bokashi gradient sky.
FLUX 3 Image printed every month and value on a correct axis, with bar heights that do not match. Klein has the bars in the right order but no values and an axis reading 300, 550, 100, 150, 200, 250, 0.
›What we asked for
A clean bar chart titled 'Monthly active users' showing six months, January through June, with the values 120, 150, 180, 170, 220 and 260, labelled axes, white background, one accent colour, no 3D effects.
Wide aspect ratio
Every model on this prompt →
›What we asked for
Website hero banner: a wide panorama of a sunlit modern co-working space with plants, the left third of the frame kept as clear wall space for text, warm neutral palette.
Infographic with steps
Every model on this prompt →
›What we asked for
An infographic card titled 'How to brew pour-over' with four numbered steps in this order: 1. Rinse the filter, 2. Bloom for 30 seconds, 3. Pour in slow circles, 4. Wait 3 minutes. A simple icon beside each step, muted palette, clean sans-serif type.
Food photography
Every model on this prompt →
›What we asked for
Overhead photograph of a margherita pizza on a wooden board, fresh basil leaves, one slice pulled out with the cheese stretching, restaurant menu photography, natural light.
Hard composition
Every model on this prompt →Both placed the book, glass, three ice cubes, pencil and apple exactly as asked.
›What we asked for
A glass of water on a wooden table with exactly three ice cubes in it, a yellow pencil resting across the rim of the glass, a blue book to the left of the glass and a red apple to the right, photographed from table height.
Edit an existing image
Every model on this prompt →Klein turned the dripper forest green and added a brass handle with nothing else moved. FLUX 3 Image kept every pixel and made the handle brass, but the body stayed black.
›What we asked for
Change the coffee dripper to a deep forest green and add a small brass handle on its right side. Keep the background, lighting and composition exactly as they are.
Frequently asked questions
Is FLUX 3 Image Klein as good as FLUX 3 Image?
On our twelve prompts it was as good on text and composition, better on the product edit and worse on the chart and the logo. BFL's own comparison is against FLUX.2 Klein, not FLUX 3 Image.
How much cheaper is Klein?
On fal, $0.009 for a 1K image against $0.048 for FLUX 3 Image at its regular rate, about a fifth. Klein's prices are listed as planned and not yet final.
Were both run the same way?
Same prompts, one attempt each, through fal, at the same 1 megapixel shapes. FLUX 3 Image ran on 8 October with prompt expansion off; Klein on 22 October with it on, Klein's default, which added no copy to any picture.
Voyager
Run any of these inside Voyager
Voyager is an agent for creative work that runs every model on this page. Brief it, and it picks the model for the job, makes the thing and hands back something you can edit. Create an account to get started.