How to train a FLUX.2 dev LoRA: trainers, VRAM and settings

Everything we have verified about training FLUX.2 dev (32B) LoRAs: which trainers support it, VRAM, settings and where to rent a GPU.

Trainer support

Trainer	Status
ai-toolkit	supported (reference)
OneTrainer	supported
musubi-tuner	supported
kohya sd-scripts	experimental
SimpleTuner	supported

VRAM

80 GB recommended; ai-toolkit ships train_lora_flux_24gb.yaml

→ Train FLUX.2 dev on 24 GB

Settings that work

Start from ai-toolkit train_lora_flux_24gb.yaml

Full guide with recipes: How to train a FLUX.2 dev LoRA.

Trainer comparisons

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.

GPU	VRAM	RunPod community $/hr	Vast.ai cheapest $/hr
RTX 3090	24 GB	$0.22	$0.12
RTX A5000	24 GB	$0.16	—
RTX PRO 4000	24 GB	$0.50	$0.26
RTX 3090 Ti	24 GB	$0.27	—
RTX A6000	48 GB	$0.33	—
RTX 4090	24 GB	$0.34	$0.39

Sources

FAQ

Which trainers support FLUX.2 dev?

ai-toolkit, OneTrainer, musubi-tuner, SimpleTuner

How much VRAM does FLUX.2 dev LoRA training need?

80 GB recommended; ai-toolkit ships train_lora_flux_24gb.yaml

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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.