AI image model comparison
FLUX.2 Klein 4B vs Seedream 4.5
Image quality, cost per image, and editing features compared side by side. Or skip the guesswork and generate with both.
Black Forest Labs
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.
- Per image
- $0.014
- Output / 1M
- $3.42
- Image Elo
- 1063
ByteDance Seed
Seedream 4.5
Seedream 4.5 is the latest in-house image generation model developed by ByteDance.
- Per image
- $0.04
- Output / 1M
- $9.58
- Image Elo
- Not available
At a glance
Quick verdict
Which model wins on the things that matter most when you're making images.
Cheaper per image
FLUX.2 Klein 4B
$0.014 vs $0.04, 2.9x cheaper
Better image quality
Not available
Not enough arena data
Better at editing
Not available
Only one editing score is available
Newer release
FLUX.2 Klein 4B
Released January 14, 2026
Quality
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
Image editing
Graphic design
Logos
Pricing
FLUX.2 Klein 4B vs Seedream 4.5 price per image
What each image actually costs, plus the underlying API rates. Cheaper option highlighted.
| Metric | ||
|---|---|---|
| Cost per imageEstimated, ~1 megapixel (1024×1024) | $0.014 | $0.04 |
| Image outputPer 1M image tokens | $3.42 | $9.58 |
| Tokens per imageHow many image tokens one ~1MP image uses | 4,096 | 4,175 |
| Prompt textPer 1M input tokens | Included | Included |
What it costs in practice
Estimated totals at standard resolution.
Single image
1 image
Social media batch
50 images
Product catalog
1,000 images
Specs
Inputs, outputs, and limits
What each model accepts, what it gives back, and how long your prompt can be.
| Metric | ||
|---|---|---|
| Accepts | Image, Text | Image, Text |
| Produces | Image | Image |
| Max prompt lengthText plus reference images | 41K tokens | 4K tokens |
| Reasoning step | No | No |
| Release date | January 14, 2026 | December 23, 2025 |
Features
Supported features
Creative controls available for each model.
| Metric | ||
|---|---|---|
| Image editingAccepts reference or source images | Supported | Supported |
| Text alongside imagesCan explain or caption what it made | Not supported | Not supported |
| Thinks before drawingPlans the image with a reasoning step | Not supported | Not supported |
| Reproducible seedsSame seed, same image | Supported | Not supported |
| Temperature controlTrade consistency for variety | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- FLUX.2 Klein 4B vs Muse Image
- FLUX.2 Klein 4B vs Seedream 5.0 Flash
- FLUX.2 Klein 4B vs Seedream 5.0 Pro
- FLUX.2 Klein 4B vs Grok Imagine Image 2.0
- FLUX.2 Klein 4B vs Seedream 5.0 Lite
- FLUX.2 Klein 4B vs Recraft V4.1 Flash
- FLUX.2 Klein 4B vs FLUX.3 Image
- FLUX.2 Klein 4B vs Qwen Image 3
- FLUX.2 Klein 4B vs FLUX.2 Max
- Seedream 4.5 vs GPT Image 2.5 Sunburst
- Seedream 4.5 vs Nano Banana 2
- Seedream 4.5 vs Nano Banana
- Seedream 4.5 vs Nano Banana 2 Lite
- Seedream 4.5 vs Muse Image
- Seedream 4.5 vs GPT-5.4 Image 2
- Seedream 4.5 vs GPT Image 2
- Seedream 4.5 vs Seedream 5.0 Flash
- Seedream 4.5 vs Nano Banana Pro
- Seedream 4.5 vs Ming Image 0.1 Design
- Seedream 4.5 vs Seedream 5.0 Pro
- Seedream 4.5 vs FLUX.2 Pro
- Seedream 4.5 vs Grok Imagine Image 2.0
- Seedream 4.5 vs Seedream 5.0 Lite
- Seedream 4.5 vs Recraft V4.1 Flash
- Seedream 4.5 vs FLUX.3 Image
- Seedream 4.5 vs Grok Imagine Image Quality
- Seedream 4.5 vs Qwen Image 3
- Seedream 4.5 vs FLUX.2 Max
- Seedream 4.5 vs MAI-Image-2.6 Flash
- Seedream 4.5 vs Riverflow V2.5 Pro
- Seedream 4.5 vs MAI-Image-2.6
- Seedream 4.5 vs FLUX.2 Flex
Our take
FLUX.2 Klein 4B is 2.9x cheaper per image. The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is FLUX.2 Klein 4B or Seedream 4.5 cheaper?
FLUX.2 Klein 4B is cheaper at about $0.014 per standard image, compared with $0.04 for Seedream 4.5. For 1,000 images that is $14 versus $40.
Can FLUX.2 Klein 4B and Seedream 4.5 edit existing images?
Yes. Both accept reference images, so you can upload a photo and ask for changes like a new background, different lighting, or added text.
Can I use FLUX.2 Klein 4B and Seedream 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple image models at once, so you can see FLUX.2 Klein 4B and Seedream 4.5 results side by side and keep the one you like.
Why choose? Generate with both.
Send one prompt to FLUX.2 Klein 4B and Seedream 4.5 at the same time. See both images side by side and keep the one you like.