Black Forest Labs
Image generation model
FLUX.2 Klein 4B
FLUX.2 [klein] 4B is the fastest and most cost-effective model in the FLUX.2 family, optimized for high-throughput use cases while maintaining excellent image quality.
At a glance
- Per image
- $0.014
- Output / 1M
- $3.42
- Image Elo
- 1063
- Editing Elo
- 1055
- Max prompt
- 41K
- Released
- Jan 2026
Pricing
FLUX.2 Klein 4B price per image
What one image costs, the underlying API rates, and what bigger batches add up to.
| Cost per imageEstimated, ~1 megapixel (1024×1024) | $0.014 |
|---|---|
| Image outputPer 1M image tokens | $3.42 |
| Tokens per imageFor one ~1MP image | 4,096 |
| Prompt textPer 1M input tokens | Included |
Single image
1 image
$0.014
Social media batch
50 images
$0.70
Product catalog
1,000 images
$14
Quality
FLUX.2 Klein 4B image quality rankings
Elo ratings from Design Arena, where people vote between two anonymous images made from the same prompt. Higher is better.
Image generation
#121063
Wins 38.8% of head-to-head votes
Image editing
#81055
Wins 38.9% of head-to-head votes
Graphic design
#121004
Wins 35.8% of head-to-head votes
Logos
#121058
Wins 37.9% of head-to-head votes
Rank is the model’s position on the Design Arena leaderboard for each category.
Specs
Inputs, outputs, and creative controls
What it accepts, what it gives back, and which controls you get.
- Accepts
- Image, Text
- Produces
- Image
- Max prompt length
- 41K tokens
- Reasoning step
- No
- Release date
- January 14, 2026
- Image editingAccepts reference or source images
- Text alongside imagesCan explain or caption what it made
- Thinks before drawingPlans the image with a reasoning step
- Reproducible seedsSame seed, same image
- Temperature controlTrade consistency for variety
Compare
FLUX.2 Klein 4B vs other models
See how FLUX.2 Klein 4B stacks up head to head on price, benchmarks, and features.
FLUX.2 Klein 4B vs Seedream 4.5
Black Forest Labs vs ByteDance Seed
See comparisonFLUX.2 Klein 4B vs Muse Image
Black Forest Labs vs Meta
See comparisonFLUX.2 Klein 4B vs Seedream 5.0 Flash
Black Forest Labs vs ByteDance Seed
See comparisonFLUX.2 Klein 4B vs Seedream 5.0 Pro
Black Forest Labs vs ByteDance Seed
See comparisonFLUX.2 Klein 4B vs Grok Imagine Image 2.0
Black Forest Labs vs xAI
See comparisonFLUX.2 Klein 4B vs Seedream 5.0 Lite
Black Forest Labs vs ByteDance Seed
See comparisonMore FLUX.2 Klein 4B comparisons
Alternatives
FLUX.2 Klein 4B alternatives
Similar models worth considering, and where each one has the edge.
ByteDance Seed
Seedream 5.0 Flash
Black Forest Labs
FLUX.3 Image
Recraft
Recraft V4.1 Flash
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does FLUX.2 Klein 4B cost per image?
A standard ~1 megapixel image from FLUX.2 Klein 4B costs about $0.014, so 1,000 images come to roughly $14. Larger sizes cost more.
Can FLUX.2 Klein 4B edit existing images?
Yes. FLUX.2 Klein 4B accepts reference images, so you can upload a photo and ask for changes like a new background, a different style, or added text.
What is the best alternative to FLUX.2 Klein 4B?
Seedream 5.0 Flash from ByteDance Seed is a strong alternative. It offers: newer release.
Can I use FLUX.2 Klein 4B alongside other image models?
Yes. Shortcut Chat sends one prompt to FLUX.2 Klein 4B and any other image models you pick at the same time, so you can compare results side by side.
Try FLUX.2 Klein 4B next to every other image model.
Use FLUX.2 Klein 4B alongside all the other image models. Use one at a time, or multiple together. Get the best image from AI.