diff --git a/api/onnx_web/diffusers/load.py b/api/onnx_web/diffusers/load.py
index 07310e74..642ccf77 100644
--- a/api/onnx_web/diffusers/load.py
+++ b/api/onnx_web/diffusers/load.py
@@ -267,12 +267,20 @@ def load_pipeline(
     # update panorama params
     if params.is_panorama():
         unet_stride = (params.unet_tile * (1 - params.unet_overlap)) // 8
-        logger.debug("setting panorama window parameters: %s/%s for UNet, %s/%s for VAE", params.unet_tile, unet_stride, params.vae_tile, params.vae_overlap)
+        logger.debug(
+            "setting panorama window parameters: %s/%s for UNet, %s/%s for VAE",
+            params.unet_tile,
+            unet_stride,
+            params.vae_tile,
+            params.vae_overlap,
+        )
         pipe.set_window_size(params.unet_tile // 8, unet_stride)
 
         for vae in VAE_COMPONENTS:
             if hasattr(pipe, vae):
-                getattr(pipe, vae).set_window_size(params.vae_tile // 8, params.vae_overlap)
+                getattr(pipe, vae).set_window_size(
+                    params.vae_tile // 8, params.vae_overlap
+                )
 
     run_gc([device])
 
diff --git a/api/onnx_web/diffusers/pipelines/panorama_xl.py b/api/onnx_web/diffusers/pipelines/panorama_xl.py
index a0c92d07..7c46326c 100644
--- a/api/onnx_web/diffusers/pipelines/panorama_xl.py
+++ b/api/onnx_web/diffusers/pipelines/panorama_xl.py
@@ -303,7 +303,14 @@ class StableDiffusionXLPanoramaPipelineMixin(StableDiffusionXLImg2ImgPipelineMix
 
         # 3.b. Encode region prompts
         regions = parse_regions(prompt)
-        region_embeds: List[Tuple[List[np.ndarray], Optional[np.ndarray], Optional[np.ndarray], Optional[np.ndarray]]] = []
+        region_embeds: List[
+            Tuple[
+                List[np.ndarray],
+                Optional[np.ndarray],
+                Optional[np.ndarray],
+                Optional[np.ndarray],
+            ]
+        ] = []
         add_region_embeds: List[np.ndarray] = []
 
         for _top, _left, _bottom, _right, _mode, region_prompt in regions:
@@ -322,9 +329,11 @@ class StableDiffusionXLPanoramaPipelineMixin(StableDiffusionXLImg2ImgPipelineMix
                 current_region_embeds[0] = np.concatenate(
                     (current_region_embeds[1], current_region_embeds[0]), axis=0
                 )
-                add_region_embeds.append(np.concatenate(
-                    (current_region_embeds[3], current_region_embeds[2]), axis=0
-                ))
+                add_region_embeds.append(
+                    np.concatenate(
+                        (current_region_embeds[3], current_region_embeds[2]), axis=0
+                    )
+                )
 
             region_embeds.append(current_region_embeds)
 
@@ -492,7 +501,7 @@ class StableDiffusionXLPanoramaPipelineMixin(StableDiffusionXLImg2ImgPipelineMix
                 )
                 latents_view_denoised = scheduler_output.prev_sample.numpy()
 
-                if mode:
+                if mode == "replace":
                     value[:, :, h_start:h_end, w_start:w_end] = latents_view_denoised
                     count[:, :, h_start:h_end, w_start:w_end] = 1
                 else:
diff --git a/api/onnx_web/diffusers/run.py b/api/onnx_web/diffusers/run.py
index b86be2b1..6c6ebc8e 100644
--- a/api/onnx_web/diffusers/run.py
+++ b/api/onnx_web/diffusers/run.py
@@ -43,8 +43,9 @@ def run_txt2img_pipeline(
     highres: HighresParams,
 ) -> None:
     # if using panorama, the pipeline will tile itself (views)
-    if params.is_panorama() or params.is_xl():
+    if params.is_panorama():
         tile_size = max(params.unet_tile, size.width, size.height)
+        logger.debug("adjusting tile size for panorama to %s", tile_size)
     else:
         tile_size = params.unet_tile
 
diff --git a/api/onnx_web/diffusers/utils.py b/api/onnx_web/diffusers/utils.py
index 152b5bca..d06a28cd 100644
--- a/api/onnx_web/diffusers/utils.py
+++ b/api/onnx_web/diffusers/utils.py
@@ -3,7 +3,7 @@ from copy import deepcopy
 from logging import getLogger
 from math import ceil
 from re import Pattern, compile
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Literal, Optional, Tuple
 
 import numpy as np
 import torch
@@ -21,6 +21,7 @@ CLIP_TOKEN = compile(r"\<clip:([-\w]+):(\d+)\>")
 INVERSION_TOKEN = compile(r"\<inversion:([^:\>]+):(-?[\.|\d]+)\>")
 LORA_TOKEN = compile(r"\<lora:([^:\>]+):(-?[\.|\d]+)\>")
 WILDCARD_TOKEN = compile(r"__([-/\\\w]+)__")
+REGION_TOKEN = compile(r"\<region:(\d+):(\d+):(\d+):(\d+):(add|replace):([^\>])\>")
 
 INTERVAL_RANGE = compile(r"(\w+)-{(\d+),(\d+)(?:,(\d+))?}")
 ALTERNATIVE_RANGE = compile(r"\(([^\)]+)\)")
@@ -446,7 +447,8 @@ def slice_prompt(prompt: str, slice: int) -> str:
         return prompt
 
 
-Region = Tuple[int, int, int, int, bool, str]
+Region = Tuple[int, int, int, int, Literal["add", "replace"], str]
+
 
 def parse_regions(prompt: str) -> List[Region]:
-    return []
+    return get_tokens_from_prompt(prompt, REGION_TOKEN)
diff --git a/api/onnx_web/server/hacks.py b/api/onnx_web/server/hacks.py
index f51b51f4..b59bb73a 100644
--- a/api/onnx_web/server/hacks.py
+++ b/api/onnx_web/server/hacks.py
@@ -2,16 +2,8 @@ import sys
 from functools import partial
 from logging import getLogger
 from os import path
-from pathlib import Path
-from typing import Dict, Optional, Union
 from urllib.parse import urlparse
 
-from optimum.onnxruntime.modeling_diffusion import (
-    ORTModel,
-    ORTStableDiffusionPipelineBase,
-)
-
-from ..torch_before_ort import SessionOptions
 from ..utils import run_gc
 from .context import ServerContext