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FLUX.2 Klein 4Bvs.Janus-Pro-1B

Which one is better?

We have not tested Janus-Pro-1B ourselves yet. Neither is in the arena. Neither has an API price.

Same prompt, two images

Same task, the first image of each.

FLUX.2 Klein 4B: Typography and layout, first image from the fixed test run
FLUX.2 Klein 4B21 out of 100

No image from the four fixed tasks for Janus-Pro-1B yet.This model does not yet have a complete GraduallyBench run.

Janus-Pro-1Bnot tested yet

Result for “Typography and layout”:only FLUX.2 Klein 4B tested

Prompt given to both modelsCreate a square editorial poster for an imaginary night train called MONDFALTER. Show the exact German headline MONDFALTER and the exact subline BERLIN NACH LISSABON. Use a restrained midnight-blue and warm-cream palette, one stylized moth, strong Swiss-grid typography, generous negative space, and no additional words or logos.

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.

Missing image run for Janus-Pro-1B

This model does not yet have a complete GraduallyBench run. Run the missing fixed tasks, archive the first output of each, and evaluate them blind.

Documentation

The numbers at a glance

Arena ratingfrom votes by users · higher is better
n/a

FLUX.2 Klein 4B

not in the arena

n/a

Janus-Pro-1B

not in the arena

GraduallyBenchour own rating, 0 to 100 · higher is better
37

FLUX.2 Klein 4B

Rank 55 of 74

n/a

Janus-Pro-1B

not tested yet

Price per imagedollars through the API · lower is better
n/a

FLUX.2 Klein 4B

no API price

n/a

Janus-Pro-1B

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 4B

Subscription
No Black Forest Labs subscription includes this model. Through other providers from €6.83 a month (Poe Basic, with limited points). 12 plans in Germany.
Via API
No API price known. Access: API, local.
License
Open weights.

Janus-Pro-1B

Subscription
n/a No plan in Germany names exactly this model.
Via API
No API price known. Access: local.
License
Open weights.

Subscriptions only count plans that name exactly this model. Subscription prices include VAT, API prices are in dollars.

GraduallyBench from Nov 1, 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.

KennzahlFLUX.2 Klein 4BJanus-Pro-1B
Ratings
Arena ratingfrom votes by users, higher is bettern/an/a
Arena rankn/an/a
Arena votesmore votes, a safer ratingn/an/a
GraduallyBenchour own rating, 0 to 10037n/a
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition21n/a
Product photographyMaterials, reflections, and fine details54n/a
Character and detailAnatomy, clothing, and spatial consistency53n/a
InfographicNumbers, labels, and visual organization19n/a
API price
Per imagelower is bettern/an/a
100 imagesn/an/a
Profile
Releasedn/aJan 27, 2025
Weightsopen means: runs locallyopenopen
AccessAPI, locallocal
Parameters4 billion1 billion
Largest outputnot consistently publishednot consistently published
Plans in Germanynaming exactly this model12n/a

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

Sources: FLUX.2 Klein 4B model source (verified Nov 1, 2026) · Janus-Pro-1B 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 4B and Janus-Pro-1B from the same arena and category. Older model versions are not used as substitutes.

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