Stable Diffusion 1 contains a model OpenAI released. The CLIP encoder that was trained on text/image pairs at OpenAI.

https://huggingface.co/runwayml/stable-diffusion-v1-5

https://huggingface.co/runwayml/stable-diffusion-v1-5/blob/m...

Uploaded to Hugging Face Jan 2021

https://huggingface.co/openai/clip-vit-large-patch14