brahianrosswill-ComfyUI_SDXL_LongContext/README.md

QUICK START

0. Download repository as ZIP. Copy paste scripts directory from repository to: C:\Users\User\Documents\ComfyUI_windows_portable

1. Edit convert_spectral.bat — set your checkpoint filename: set "CKPT_NAME=FernflowerAI-2D.safetensors"

2. Double-click convert_spectral.bat. Script will generate: -> your_model_long248.safetensors in ComfyUI\models\checkpoints directory

3. Create directory sdxl_long_context in ComfyUI\custom_nodes directory

4. Copy paste __init__.py and nodes.py to sdxl_long_context directory

5. Restart ComfyUI

6. Use workflow_sdxl_long248.json from examples directory

IMPORTANT

• Always convert from ORIGINAL checkpoint, not already converted
• Prompts up to 77 tokens = almost identical to original model
• Only 248 tokens is stable. 512+ breaks the model.
• Works with any SDXL checkpoint (base, fine-tuned, merged)
• VRAM increase is minimal (~0.5 GB)

LICENSE: MIT