This is a "checkpoint" file containing the weights of the neural network. Modern versions often use .safetensors for better security, but .ckpt was the standard for v1.5-based models.

It is a "fine-tuned" model. Since Midjourney is a closed-source service, developers trained Stable Diffusion on Midjourney-generated images to replicate its lighting, composition, and texture styles.

Find the or recommended settings (CFG scale/Sampler) for it.

If you tell me , I can help you:

The filename typically refers to a custom Stable Diffusion checkpoint designed to mimic the aesthetic of Midjourney v4.