diff --git a/js/index.js b/js/index.js
index 646ac88..c4acbc5 100644
--- a/js/index.js
+++ b/js/index.js
@@ -298,9 +298,6 @@ const ext = {
           node.widgets.find((x) => x.name === "embedding_id").value = id;
 
           const ckpt = node.widgets.find((x) => x.name === "ckpt").value;
-          const model_type = node.widgets.find(
-            (x) => x.name === "model_type"
-          ).value;
 
           api
             .fetchApi("/sam_model", {
@@ -309,7 +306,6 @@ const ext = {
                 image: connectedImageFileName,
                 embedding_id: id,
                 ckpt,
-                model_type,
               }),
             })
             .then(() => {
diff --git a/routes.py b/routes.py
index 2d8ed43..3b2806d 100644
--- a/routes.py
+++ b/routes.py
@@ -7,6 +7,7 @@ import folder_paths
 import json
 import numpy as np
 import server
+import re
 
 # For speeding up ONNX model, see https://github.com/facebookresearch/segment-anything/tree/main/demo#onnx-multithreading-with-sharedarraybuffer
 def inject_headers(original_handler):
@@ -65,7 +66,7 @@ async def post_sam_model(request):
     if not os.path.exists(emb_filename):
         image = load_image(post.get("image"))
         ckpt = post.get("ckpt")
-        model_type = post.get("model_type")
+        model_type = re.findall(r'vit_[lbh]', ckpt)[0]
         ckpt = folder_paths.get_full_path("sams", ckpt)
         sam = sam_model_registry[model_type](checkpoint=ckpt)
         predictor = SamPredictor(sam)
diff --git a/sam/sam.py b/sam/sam.py
index 81ad70f..7c03ffd 100644
--- a/sam/sam.py
+++ b/sam/sam.py
@@ -2,6 +2,7 @@ import folder_paths
 import os
 import numpy as np
 import torch
+import re
 from segment_anything import sam_model_registry, SamPredictor
 from einops import rearrange, repeat
 
@@ -24,7 +25,6 @@ class SAM:
         return {
             "required": {
                 "image": ("IMAGE",),
-                "model_type": (["vit_h", "vit_l", "vit_b"],),
                 "ckpt": (folder_paths.get_filename_list("sams"),),
                 "embedding_id": (
                     "STRING",
@@ -40,13 +40,14 @@ class SAM:
     RETURN_TYPES = ("SAM_PROMPT",)
     FUNCTION = "load_image"
 
-    def load_image(self, image, model_type, ckpt, embedding_id, image_prompts_json):
+    def load_image(self, image, ckpt, embedding_id, image_prompts_json):
         import json
 
         global global_predictor
 
         if global_predictor is None:
             ckpt = folder_paths.get_full_path("sams", ckpt)
+            model_type = re.findall(r'vit_[lbh]', ckpt)[0]
             sam = sam_model_registry[model_type](checkpoint=ckpt)
             predictor = SamPredictor(sam)
             global_predictor = predictor
diff --git a/sam/sam_prompt.py b/sam/sam_prompt.py
index 7dd99db..81598aa 100644
--- a/sam/sam_prompt.py
+++ b/sam/sam_prompt.py
@@ -1,6 +1,7 @@
 import folder_paths
 import os
 import numpy as np
+import re
 from segment_anything import sam_model_registry, SamPredictor
 
 
@@ -19,7 +20,6 @@ class SAM_Prompt_Image:
         return {
             "required": {
                 "image": ("IMAGE",),
-                "model_type": (["vit_h", "vit_l", "vit_b"],),
                 "ckpt": (folder_paths.get_filename_list("sams"),),
                 "embedding_id": (
                     "STRING",
@@ -35,12 +35,13 @@ class SAM_Prompt_Image:
     RETURN_TYPES = ("SAM_PROMPT",)
     FUNCTION = "load_image"
 
-    def load_image(self, image, model_type, ckpt, embedding_id, image_prompts_json):
+    def load_image(self, image, ckpt, embedding_id, image_prompts_json):
         import json
 
         emb_filename = f"{self.output_dir}/{embedding_id}.npy"
         if not os.path.exists(emb_filename):
             ckpt = folder_paths.get_full_path("sams", ckpt)
+            model_type = re.findall(r'vit_[lbh]', ckpt)[0]
             sam = sam_model_registry[model_type](checkpoint=ckpt)
             predictor = SamPredictor(sam)