Flux.2 Klein and Flux.2 Dev LoRAs: match the base, keep them all
Black Forest Labs released FLUX.2 [klein] on 15 January 2026 in 4B and 9B sizes, each as a distilled 4-step model and as Base (undistilled). FLUX.2 [dev] is the 32B open-weight model from November 2025. LoRAs do not cross over: Dev, Klein 4B and Klein 9B each need LoRAs made for that exact model, and Flux.1 LoRAs work with none of them.
Match the base, then keep every Flux.2 LoRA in your private vault.
Plans from 100 GB to 5 TB. From $4.99 a month.
Trending Flux 2 / Klein LoRAs this week
The hottest Flux 2 / Klein LoRAs on ModelTrends this week, refreshed daily. Each name links to its ModelTrends page.
| LoRA | Heat | This week | Size | Action |
|---|---|---|---|---|
| Elusarca's Detail Enhancer | Flux Klein 9B | 8,483° | +0.2% | 632 MB | Add to BigVault |
| Klein Detail Slider | 8,447° | +0.2% | 19.8 MB | Add to BigVault |
| 70s Sci Fi Movie | 8,289° | +0.6% | 79 MB | Add to BigVault |
| Replace Subject [Klein 4B & 9B] | 8,244° | +0.2% | 79 MB | Add to BigVault |
| Boreal Flux Dev2 (Boring Reality LoRA for Flux.2 Dev) | 8,220° | +0.2% | 317.2 MB | Add to BigVault |
| Hyperdetailed Illustration Klein9B | 8,192° | +0.7% | 79 MB | Add to BigVault |
| Simpson Style | 8,137° | +0.1% | 79 MB | Add to BigVault |
| Pixel Art Spritesheet 4 Walk Small | 8,135° | +1.4% | 88.1 MB | Add to BigVault |
| Disney Mid Century Animation | 8,118° | +0.6% | 79 MB | Add to BigVault |
| Impressionism Oil Painting [Flux 1/Z Image/Klein/Ernie] Klein 9b | 8,059° | +0.1% | 83 MB | Add to BigVault |
Klein 4B vs Klein 9B vs Flux.2 Dev: which LoRA fits which
| Model | Size | VRAM (about) | LoRAs |
|---|---|---|---|
| FLUX.2 [klein] 4B | 4B, distilled or Base | 8.4 GB | Made for Klein 4B |
| FLUX.2 [klein] 9B | 9B, distilled or Base | 19.6 GB | Made for Klein 9B |
| FLUX.2 [dev] | 32B | n/a | Made for Flux.2 Dev |
Sizes and VRAM per Black Forest Labs. Some LoRAs name both Klein sizes and ship a file for each.
Why Flux.1 LoRAs don't work here
FLUX.2 is a different model from FLUX.1, so LoRAs don't carry over in either direction. For FLUX.1 Dev and Krea Dev LoRAs, see Flux LoRAs.
How big are Flux 2 / Klein LoRAs?
Black Forest Labs says Klein LoRAs are typically 10 to 200 MB. In the ModelTrends trending snapshot (10 LoRAs, a small sample) the median was 123 MB, from 19.8 MB to 632 MB. They are .safetensors files.
| Plan | Storage | Price | About how many fit (123 MB median) |
|---|---|---|---|
| Locker | 100 GB | $4.99 a month | ≈ 813 |
| Library | 500 GB | $14.99 a month | ≈ 4,065 |
| Archive | 1 TB | $24.99 a month | ≈ 8,130 |
| Studio | 5 TB | $99 a month | ≈ 40,650 |
Where Flux 2 / Klein LoRAs go, and how to keep them organized
ComfyUI and Forge folders
ComfyUI reads LoRAs from ComfyUI/models/loras/, Forge from webui/models/Lora/. One subfolder per family or base keeps things findable: loras/klein4b/, loras/klein9b/, loras/flux2-dev/. Then refresh the LoRA list.
Name files and keep trigger words
Name each file author-concept-version and keep its trigger words next to it, so you still know how to use it months later (how to install a LoRA, step by step).
Keep the whole folder in your private vault
Drag your whole models folder into BigVault. It sits in our own encrypted storage, and you can download it again on any computer (download scripts for Mac, Linux and Windows).
Add a Flux 2 / Klein LoRA from Civitai in one click
Paste a Civitai model link in your vault and BigVault adds it in one click. It keeps the model's details and trigger words with the file, and tidies file names and descriptions. Imports run on our servers in the background, so you can close the page.
Building a collection? Read how to keep your own Civitai archive.
Render Flux 2 / Klein LoRAs on Graydient (Beta)
Graydient has workflows for Flux.2 and Klein: flux2, flux2-klein and flux2-klein9 (Klein 9B: graydient.ai/workflows/flux2-klein9). Rendering a model from your vault on Graydient is in Beta and needs a Graydient plan; .safetensors files under 25 GB are compatible, apart from a few edge cases. Pasting vault links into the Graydient dashboard is coming soon.
Graydient: “Use 100,000+ Civitai models, instantly installable in one click.”
Flux 2 / Klein LoRA questions
- Do Flux.1 LoRAs work on Klein?
- No. Flux.1 LoRAs work with none of the Flux.2 models: Dev, Klein 4B and Klein 9B each need LoRAs made for that exact model.
- Do Klein 4B LoRAs work on Klein 9B?
- Match the exact base. A LoRA made for Klein 4B goes with Klein 4B, and one made for 9B with 9B.
- What is Klein Base?
- Each Klein size comes as a distilled 4-step model and as Base, the undistilled version.
- How big are Klein LoRAs?
- Black Forest Labs says typically 10 to 200 MB. In the ModelTrends trending snapshot the median was 123 MB.
- Where do I put Klein LoRAs?
- In ComfyUI/models/loras/, with one subfolder per base: klein4b, klein9b and flux2-dev.
Keep every Flux.2 LoRA in one private place.
Plans from 100 GB to 5 TB. From $4.99 a month.
Questions? info@modeltrends.ai