app.py

import gradio as gr
from gradio.mix import Parallel

model1=gr.Interface.load("runwayml/stable-diffusion-v1-5", live=False,preprocess=True, postprocess=False)
model2=gr.Interface.load("CompVis/stable-diffusion-v1-4", live=False,preprocess=True, postprocess=False)
model3=gr.Interface.load("stabilityai/stable-diffusion-2-1-base", live=False,preprocess=True, postprocess=False)

gr.Parallel(model1, model2, model3).launch()