Black Forest is not just any AI startup: The company was co-founded by the engineers who built the technology behind Stability AI. And it has a big-name customer. Elon Musk’s X.ai is using Black Forest’s Flux.1 text-to-image model to power image generation in its Grok chatbot. That’s a service that set people chattering immediately after it was launched in part because of the audacious results people generated with it.