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Stability AI is the company behind Stable Diffusion, the open-source image generation models that transformed AI creativity. UK developers and designers use Stability's models — via API or self-hosted — to generate images, edit photos, and build creative tools with full control over the pipeline. Their Developer Platform offers simple APIs for image generation, upscaling, and video. Pricing is credit-based with a free tier. Stability models can be self-hosted, which suits UK companies with strict data requirements. For open-source-first AI image generation, Stability AI is the reference point.