SDXL - LM Studio Prompt Enhancer - gemma-4-12b-qat

This workflow requires my Comfyui-lmstudio-prompt-enhancer custom node which is installable via Comfy Manager. Learn more about this custom node 🛈 IMPORTANT!!! You will need to search for, download, and load the model google/gemma-4-12b-qat in LM studio. You will also need to start the API server and generate an API Key. Learn how to configure LM Studio here. Notes for using google/gemma-4-12b-qat I chose the QAT variant over the non-QAT variant as this workflow can benefit from optimized memory utilization. This is a memory efficient model which is fast and does a decent job at generating aesthetically pleasing prompts. I set the max tokens to 1500, this higher value is to accommodate the reasoning tokens. If the image looks flat, check the logs in LM Studio, the last log entry will contain a JSON path x.choices[0].message.content if the content field is empty that means the LLM ran out of reasoning tokens, this can be resolved by increasing max_tokens .