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Train a FLUX.3 Image Klein LoRA on 24 GB VRAM

Can you train a FLUX.3 Image Klein LoRA on a 24 GB GPU? Here is what the sources actually say.

Exact VRAM data we have

SimpleTuner recipes: Base from 24 GB (512px, batch 3) up to 144 GB; distilled klein at 24 GB (768px, batch 1) or 80 GB (1024px, batch 4)

Trainers that support FLUX.3 Image Klein

• ai-toolkit: supported (day-0, PR #1078 merged Oct 15; fixes Oct 15)
• SimpleTuner: supported (Base + distilled klein recipes, 24-144 GB)

Other tiers: FLUX.3 Image Klein overview

Where to rent a 24 GB+ GPU

Cheapest 24 GB+ cards (2026-10-16 14:43 UTC) from RunPod and Vast.ai. Prices move constantly; see the live price table.

Sources

• huggingface.co/black-forest-labs/flux-3-image-klein-base
• github.com/ostris/ai-toolkit/pull/1078
• github.com/ostris/ai-toolkit/commit/438595b
• github.com/ostris/ai-toolkit/commit/0947356
• github.com/bghira/SimpleTuner/blob/main/documentation/quickstart/FLUX3
• github.com/bghira/SimpleTuner/commit/1cc48ca
• huggingface.co/SimpleTuner/flux-3-klein-image-training-assistant
• github.com/ostris/ai-toolkit/commit/9d408eb

FAQ

Is 24 GB enough to train a FLUX.3 Image Klein LoRA?

Yes. SimpleTuner ships 24 GB recipes for FLUX.3 Klein: Base at 512px (batch 3) and distilled klein at 768px (batch 1).

What is the cheapest 24 GB+ GPU to rent?

See the table above and the live price page.

Data updated 2026-10-16. Disclosure: RunPod and Vast.ai links are referral links; ImageLoRA may earn a commission at no cost to you. unknown = not yet verified from a source.