This is a GGUF conversion of Google's T5 v1.1 XXL encoder model.
The weights can be used with ./llama-embedding or with the ComfyUI-GGUF custom node together with image generation models.
This is a non imatrix quant as llama.cpp doesn't support imatrix creation for T5 models at the time of writing. It's therefore recommended to use Q5_K_M or larger for the best results, although smaller models may also still provide decent results in resource constrained scenarios.