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Head-to-head comparison

FLUX.2 Pro vs. FLUX.2 Klein 9B

Compare arena scores with documented retrieval dates, task-specific image pricing, and verified specifications. Text-to-image generation and image editing are never blended into an artificial overall score.

12

shared result series

4

shared sample prompts

2026-08-16

latest arena retrieval

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Specifications and cost

General specifications and task-specific pricing

A model can have one price for generating new images and another for editing. Prices therefore remain tied to the corresponding arena configuration.

Specifications and pricing for FLUX.2 Pro and FLUX.2 Klein 9B
AttributeFLUX.2 ProFLUX.2 Klein 9B
ProviderBlack Forest LabsBlack Forest Labs
ReleasedNovember 2025January 2026
AccessAPI, Web appAPI, local
LifecycleNo separate lifecycle noticeNo separate lifecycle notice
WeightsProprietaryOpen weights
ParametersNot published9 billion
Maximum output4 Megapixel4 Megapixel
Arena configurationPro9B
Text-to-image price$30 per 1,000 images$15 per 1,000 images
Editing price$45 per 1,000 images$17 per 1,000 images
Technical sourceModel sourceVerified 2026-08-15Model sourceVerified 2026-08-15
FLUX.2 ProFLUX.2 Klein 9B
Text to Image ArenaUSD per 1,000 images at 1,024 × 1,024 pixels
FLUX.2 Pro$30
FLUX.2 Klein 9B$15Lower price
Image Editing ArenaUSD per 1,000 images at 1,024 × 1,024 pixels
FLUX.2 Pro$45
FLUX.2 Klein 9B$17Lower price

Independent preference tests

Shared arena benchmarks

Artificial Analysis and Arena derive scores from blind comparisons. Raters see outputs for the same prompt and choose the image they prefer. Separate series cover text rendering, photorealism, portraits, art, commercial design, and image editing. Confidence intervals indicate how certain a measured lead is.

12 shared result series
FLUX.2 ProFLUX.2 Klein 9B
Text to Image ArenaBlind preference from the same prompt, higher is better
FLUX.2 Pro1,211 EloHigher arena score
FLUX.2 Klein 9B1,149 Elo
Image Editing ArenaBlind preference from the same prompt, higher is better
FLUX.2 Pro1,172 EloNo clear arena lead
FLUX.2 Klein 9B1,168 Elo
Arena Text to Image: 3D modelingBlind preference from the same prompt, higher is better
FLUX.2 Pro1,149.387 arena pointsHigher arena score
FLUX.2 Klein 9B1,078.396 arena points
Arena Text to Image: ArtBlind preference from the same prompt, higher is better
FLUX.2 Pro1,163.048 arena pointsHigher arena score
FLUX.2 Klein 9B1,078.844 arena points
Arena Text to Image: CartoonBlind preference from the same prompt, higher is better
FLUX.2 Pro1,161.019 arena pointsHigher arena score
FLUX.2 Klein 9B1,063.975 arena points
Arena Text to Image: Commercial designBlind preference from the same prompt, higher is better
FLUX.2 Pro1,156.46 arena pointsHigher arena score
FLUX.2 Klein 9B1,069.649 arena points
Arena Text to Image: OverallBlind preference from the same prompt, higher is better
FLUX.2 Pro1,154.786 arena pointsHigher arena score
FLUX.2 Klein 9B1,069.517 arena points
Arena Text to Image: PhotorealismBlind preference from the same prompt, higher is better
FLUX.2 Pro1,151.499 arena pointsHigher arena score
FLUX.2 Klein 9B1,090.118 arena points
Arena Text to Image: PortraitsBlind preference from the same prompt, higher is better
FLUX.2 Pro1,146.513 arena pointsHigher arena score
FLUX.2 Klein 9B1,092.062 arena points
Arena Text to Image: Text renderingBlind preference from the same prompt, higher is better
FLUX.2 Pro1,156.451 arena pointsHigher arena score
FLUX.2 Klein 9B1,057.362 arena points
Arena Image Editing: Multi-image editingBlind preference from the same prompt, higher is better
FLUX.2 Pro1,238.237 arena pointsHigher arena score
FLUX.2 Klein 9B1,212.545 arena points
Arena Image Editing: OverallBlind preference from the same prompt, higher is better
FLUX.2 Pro1,244.29 arena pointsHigher arena score
FLUX.2 Klein 9B1,224.433 arena points
Arena benchmark scores for FLUX.2 Pro and FLUX.2 Klein 9B
BenchmarkFLUX.2 ProFLUX.2 Klein 9BSource
Text to Image Arena
1,211 EloHigher arena score
Rank 26, 95% confidence interval: ±9, 9,404 ratings
1,149 Elo
Rank 60, 95% confidence interval: ±9, 7,939 ratings
Artificial AnalysisRetrieved 2026-08-15
Image Editing Arena
1,172 EloNo clear arena lead
Rank 29, 95% confidence interval: ±7, 11,347 ratings
1,168 Elo
Rank 30, 95% confidence interval: ±7, 11,020 ratings
Artificial AnalysisRetrieved 2026-08-15
Arena Text to Image: 3D modeling
1,149.387 arena pointsHigher arena score
Rank 28, 95% confidence interval: ±6.29, 17,241 ratings
1,078.396 arena points
Rank 54, 95% confidence interval: ±6.95, 13,814 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Art
1,163.048 arena pointsHigher arena score
Rank 26, 95% confidence interval: ±5.76, 25,069 ratings
1,078.844 arena points
Rank 53, 95% confidence interval: ±6.28, 19,055 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Cartoon
1,161.019 arena pointsHigher arena score
Rank 27, 95% confidence interval: ±4.57, 66,010 ratings
1,063.975 arena points
Rank 55, 95% confidence interval: ±5.01, 53,034 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Commercial design
1,156.46 arena pointsHigher arena score
Rank 26, 95% confidence interval: ±4.31, 64,392 ratings
1,069.649 arena points
Rank 56, 95% confidence interval: ±4.59, 55,183 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Overall
1,154.786 arena pointsHigher arena score
Rank 26, 95% confidence interval: ±3.06, 175,196 ratings
1,069.517 arena points
Rank 55, 95% confidence interval: ±3.25, 142,762 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Photorealism
1,151.499 arena pointsHigher arena score
Rank 30, 95% confidence interval: ±4.29, 74,515 ratings
1,090.118 arena points
Rank 54, 95% confidence interval: ±4.7, 60,335 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Portraits
1,146.513 arena pointsHigher arena score
Rank 31, 95% confidence interval: ±5.23, 39,262 ratings
1,092.062 arena points
Rank 55, 95% confidence interval: ±5.73, 32,758 ratings
ArenaRetrieved 2026-08-16
Arena Text to Image: Text rendering
1,156.451 arena pointsHigher arena score
Rank 27, 95% confidence interval: ±4.5, 59,326 ratings
1,057.362 arena points
Rank 56, 95% confidence interval: ±4.77, 51,643 ratings
ArenaRetrieved 2026-08-16
Arena Image Editing: Multi-image editing
1,238.237 arena pointsHigher arena score
Rank 20, 95% confidence interval: ±3.8, 171,464 ratings
1,212.545 arena points
Rank 25, 95% confidence interval: ±4.03, 147,846 ratings
ArenaRetrieved 2026-08-16
Arena Image Editing: Overall
1,244.29 arena pointsHigher arena score
Rank 29, 95% confidence interval: ±2.97, 479,952 ratings
1,224.433 arena points
Rank 35, 95% confidence interval: ±2.9, 507,400 ratings
ArenaRetrieved 2026-08-16

Visual comparison

Sample images from documented runs

Our images complement preference data, but do not replace it. The prompt, request count, and selection rule match. Provider resolution, quality tier, randomness, and prompt processing remain visible limitations, so this is not a fully controlled laboratory test.

Largely standardized comparison protocol. Both models receive the same archived prompt, 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. These images are a practical visual test, not a reconstruction of the arena configuration.

Character and detail

Anatomy, clothing, and spatial consistency

FLUX.2 Pro, Character and detail
FLUX.2 Pro
FLUX.2 Klein 9B, Character and detail
FLUX.2 Klein 9B
Prompt and settings

Create a square cinematic full-body portrait of a fictional bicycle courier waiting under a transparent umbrella at a rainy tram stop in Hamburg at blue hour. She wears a mustard raincoat, navy trousers, red sneakers, a silver helmet, and carries a teal messenger bag. Keep both hands visible, render the bicycle correctly, use realistic wet-street reflections, and include no readable brand names.

FLUX.2 Pro. Provider Together, 1024x1024, n=1, seed=provider random, provider default steps, model ID black-forest-labs/FLUX.2-pro, generated Aug 14, 2026, 12:30 PM. Source
FLUX.2 Klein 9B. Provider fal.ai, requested 1024x1024, n=1, seed=1587849924, estimated cost $0.006291, model ID fal-ai/flux-2/klein/9b, generated Aug 14, 2026, 1:52 PM. Source

Protocol gradually-image-comparison-v1, selection rule: first result.

Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6

FLUX.2 Pro, image SHA 256: 9eec1a6900b6031703d2e797b93c2aba6c5f45b4807b560a0bf1e37eac9e20f2

FLUX.2 Pro, request SHA 256: 8c40a10f47e1407d26ab10f5c9d815e533bce798cf0adf5a9c1e6ddfc3f3584e

FLUX.2 Klein 9B, image SHA 256: 84eceab680e59de6b9d4e68b3c21f6515ce093ff7d110992049e847570dd565f

FLUX.2 Klein 9B, request SHA 256: 5d005ee24926d68b7d2299b8ecbe4e14919f652761f6de2568a043f2a6258da0

Infographic

Numbers, labels, and visual organization

FLUX.2 Pro, Infographic
FLUX.2 Pro
FLUX.2 Klein 9B, Infographic
FLUX.2 Klein 9B
Prompt and settings

Create a square German infographic titled SO FUNKTIONIERT PHOTOSYNTHESE. Show exactly four numbered steps in this order: 1 LICHT, 2 WASSER, 3 CO₂, 4 ZUCKER + SAUERSTOFF. Use a clean editorial science style with one plant cross-section, simple arrows, high contrast, legible labels, and no other text.

FLUX.2 Pro. Provider Together, 1024x1024, n=1, seed=provider random, provider default steps, model ID black-forest-labs/FLUX.2-pro, generated Aug 14, 2026, 12:31 PM. Source
FLUX.2 Klein 9B. Provider fal.ai, requested 1024x1024, n=1, seed=1082231541, estimated cost $0.006291, model ID fal-ai/flux-2/klein/9b, generated Aug 14, 2026, 1:52 PM. Source

Protocol gradually-image-comparison-v1, selection rule: first result.

Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f

FLUX.2 Pro, image SHA 256: ea47f772cdfa26bf21528ae7e09d245eb7a3be7d3185af15cedd7d21acdfbb09

FLUX.2 Pro, request SHA 256: 9ef85d9cf32f0f9b974eeb0b389c1fbf1403f4e266af0ce98e0ca83da0fe23c1

FLUX.2 Klein 9B, image SHA 256: 1d2eb263ca5a25794a88df7bb04f5c13e10ed9a289371d1dcc7ed6d6e0a297e2

FLUX.2 Klein 9B, request SHA 256: 8b8014fc63f520d73ff57d3d8df5eae880097383167d44918b963f2830d09940

Product photography

Materials, reflections, and fine details

FLUX.2 Pro, Product photography
FLUX.2 Pro
FLUX.2 Klein 9B, Product photography
FLUX.2 Klein 9B
Prompt and settings

Create a square premium product photograph of a brushed titanium wristwatch standing upright on dark green marble. The watch has a cream dial, thin black hands set to 10:10, twelve distinct hour markers, a realistic crown, and a dark brown leather strap. Soft window light from the left, controlled reflections, shallow depth of field, no text, no logo, no extra objects.

FLUX.2 Pro. Provider Together, 1024x1024, n=1, seed=provider random, provider default steps, model ID black-forest-labs/FLUX.2-pro, generated Aug 14, 2026, 12:30 PM. Source
FLUX.2 Klein 9B. Provider fal.ai, requested 1024x1024, n=1, seed=1388538280, estimated cost $0.006291, model ID fal-ai/flux-2/klein/9b, generated Aug 14, 2026, 1:39 PM. Source

Protocol gradually-image-comparison-v1, selection rule: first result.

Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3

FLUX.2 Pro, image SHA 256: 4d9b922f59b329c5ac3532222c8e340e7fdcb1920ce6f03ad9299f25a6beec43

FLUX.2 Pro, request SHA 256: 96c65fc91b32da0a02970457fbf90c6928e1f7a5b45177fa3ef08f8bc32c9b82

FLUX.2 Klein 9B, image SHA 256: e7208f19ccfb9b810b9648cb1861797b7155ad91933d1660059236cef413ebe0

FLUX.2 Klein 9B, request SHA 256: 21e2c14d1b6315c30134e1390f531349608855d4ef1a87527e6d0ba57b2974ca

Typography and layout

Legible text, hierarchy, and composition

FLUX.2 Pro, Typography and layout
FLUX.2 Pro
FLUX.2 Klein 9B, Typography and layout
FLUX.2 Klein 9B
Prompt and settings

Create 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.

FLUX.2 Pro. Provider Together, 1024x1024, n=1, seed=provider random, provider default steps, model ID black-forest-labs/FLUX.2-pro, generated Aug 14, 2026, 2:02 PM. Source
FLUX.2 Klein 9B. Provider fal.ai, requested 1024x1024, n=1, seed=1340991019, estimated cost $0.006291, model ID fal-ai/flux-2/klein/9b, generated Aug 14, 2026, 2:41 PM. Source

Protocol gradually-image-comparison-v1, selection rule: first result.

Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419

FLUX.2 Pro, image SHA 256: 5a5d8ccd657d7522bc39fdec4b0aecf198b42c282a5aefde9461239dfe5c0396

FLUX.2 Pro, request SHA 256: 3e170f568fe4b6040423f0df065d9227f586d5da3d911a4251bcc368dfe333c0

FLUX.2 Klein 9B, image SHA 256: c5f23870e70f2245d24a3689f2579ceb770e5edf8c3c89b7d6ed7ae138f262f6

FLUX.2 Klein 9B, request SHA 256: 530872e813e988ba95025956a3743c6111120af963d90b8970a8bf3eced5547b

How to read this comparison

An Elo score is not a verdict on creativity

A higher arena score means this specific configuration was preferred more often in blind comparisons.

Typography, character consistency, local execution, licensing, and price may matter more to your workload than overall visual appeal.

Prices cover 1,000 images at 1,024 × 1,024 pixels using settings documented by Artificial Analysis. Subscriptions and special rates are excluded.

More matchups

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