// FLUX · Image generation
FLUX.1-Fill-dev: VRAM & local deployment
11.9B parameters. About 8.4 GB at 4-bit and 26.7 GB at BF16.
released 2024-11-20licence: Non-commercialmemory figures are estimates
01Specs
| Publisher | Black Forest Labs · black-forest-labs |
|---|---|
| Family / series | FLUX · FLUX.1-Fill-dev |
| Type | Image generation |
| Parameters | 11.9B Source: counted from official safetensors weights |
| Released weights | BF16 · 24.1 GBdownload |
| Licence | flux-1-dev-non-commercial-license · Non-commercialResearch / non-commercial licence: commercial use is not allowed without a separate agreement. |
| Released | 2024-11-20 (Hugging Face repo created) |
| Access | Gated: accept the licence on Hugging Face before downloading. |
02How much VRAM it needs (estimate)
Image models: memory depends on resolution, batch and which text encoders are kept on the GPU; Diffusers / ComfyUI can offload parts to CPU. The weight size below is the main transformer only.
| Precision | Weights | Weights + overhead | Smallest GPU | Mac |
|---|---|---|---|---|
| BF16 / FP16 (original) | 23.8 GB | 26.7 GB | RTX 5090 32GB | Mac 64GB |
| FP8 / INT8 / Q8_0 | 12.7 GB | 14.4 GB | 16GB GPU | Mac 24GB |
| 4-bit (Q4_K_M / AWQ / GPTQ-Int4) | 7.2 GB | 8.4 GB | 12GB GPU | Mac 16GB |
Bits per weight: BF16 16, FP8 8.5, 4-bit 4.85. “Fits” = total ≤ 90% of memory; Mac GPU can use ~2/3 of unified memory (≤36GB) or ~3/4 (larger). For MoE, all experts must be in memory, so size by total parameters. Method →
03How to run it
Only runtimes the publisher or the runtime’s official library names for this model.
- Diffusers — mentioned in the official model card
04Official repositories & quantised builds
1 official repo(s) from black-forest-labs.
- FLUX.1-Fill-dev main
05Other FLUX models
All 14 →| Model | Params | 4-bit total | Released |
|---|---|---|---|
| flux-3-image-klein-pup | 9.41B | 6.8 GB | 2026-10-14 |
| flux-3-image-klein | 5.55B | 4.2 GB | 2026-10-13 |
| FLUX.2-klein-9b-kv | 9.08B | 6.6 GB | 2026-03-09 |
| FLUX.2-klein-4B | 3.88B | 3.1 GB | 2026-01-14 |
| FLUX.2-klein-9B | 9.08B | 6.6 GB | 2026-01-14 |
| FLUX.2-dev | 32.2B | 22.0 GB | 2025-11-22 |
| FLUX.1-Krea-dev | 11.9B | 8.4 GB | 2025-07-07 |
| FLUX.1-Kontext-dev | 11.9B | 8.4 GB | 2025-05-28 |
06Sources
Data checked 2025-06-27. Parameters, context and licence are copied from the official repository; memory figures are our estimates.