Midjourney’s official documentation identifies V8.2 as its current default model version. For the underlying model, two third-party sources offer broad descriptions: G2 calls it proprietary, while CometAPI characterizes it as using diffusion models. Neither description, by itself, establishes a precise architecture or technical lineage. (docs.midjourney.com) (G2; CometAPI)
What “Midjourney model” means
A version label and an architecture description answer different questions. Midjourney’s version documentation describes successive versions as different models and says V8.2 became the default on July 24, 2026. It also explains that users can select a version in settings or specify one in a prompt. (docs.midjourney.com)
For the underlying model, G2 describes Midjourney as using its own proprietary model and says it is not built on GPT or an open-source base. CometAPI broadly describes it as using diffusion models. These are third-party characterizations, not a detailed technical specification from Midjourney; they do not establish a specific architecture or lineage. (G2; CometAPI)
Midjourney’s official version page identifies model versions and their features. Its public training-content summary identifies the Midjourney Image and Video family and lists dependencies for V8, V8.1, and V8.2. Those sources do not specify a particular architecture or named external base model. (docs.midjourney.com)
Can you use Midjourney through a production API?
The public first-party materials cited here do not document a generally available production API. On July 16, 2025, Midjourney said it was starting to investigate opening an Enterprise API. That announcement describes an investigation, not a released API or a production-access guarantee. (updates.midjourney.com)
Midjourney’s getting-started guide describes creating images on its website. That guide is not API implementation documentation. Don’t assume a third-party service offering Midjourney access is official or endorsed; before building around one, confirm authorization, available versions and features, terms, limits, and support directly with Midjourney. (docs.midjourney.com)
Bottom line
Midjourney’s documented default is V8.2. G2 describes the model as proprietary, and CometAPI broadly calls it diffusion-based, but those secondary-source descriptions do not establish its precise architecture. For production automation, the cited public materials do not provide an official API specification; seek current first-party confirmation before relying on API access.
Sources
Public Summary of Training Content – Midjourney
Enterprise API Survey – Midjourney
Getting Started Guide – Midjourney
I Tested Midjourney vs. DALL·E to Find the Best AI Image Generator