diff --git a/apps/shark_studio/web/ui/chat.py b/apps/shark_studio/web/ui/chat.py
index 73c0417bc7..8aacf18df5 100644
--- a/apps/shark_studio/web/ui/chat.py
+++ b/apps/shark_studio/web/ui/chat.py
@@ -110,6 +110,110 @@ def chat_fn(
         history[-1][-1] = "Getting the model ready... Done"
         yield history, ""
         history[-1][-1] = ""
+    if "cuda" in device:
+        device = "cuda"
+    elif "sync" in device:
+        device = "cpu-sync"
+    elif "task" in device:
+        device = "cpu-task"
+    elif "vulkan" in device:
+        device_id = int(device.split("://")[1])
+        device = "vulkan"
+    elif "rocm" in device:
+        device = "rocm"
+    else:
+        print("unrecognized device")
+
+    from apps.language_models.scripts.vicuna import ShardedVicuna
+    from apps.language_models.scripts.vicuna import UnshardedVicuna
+    from apps.stable_diffusion.src import args
+
+    new_model_vmfb_key = f"{model_name}#{model_path}#{device}#{device_id}#{precision}#{download_vmfb}"
+    if vicuna_model is None or new_model_vmfb_key != model_vmfb_key:
+        model_vmfb_key = new_model_vmfb_key
+        max_toks = 128 if model_name == "codegen" else 512
+
+        # get iree flags that need to be overridden, from commandline args
+        _extra_args = []
+        # vulkan target triple
+        vulkan_target_triple = args.iree_vulkan_target_triple
+        from shark.iree_utils.vulkan_utils import (
+            get_all_vulkan_devices,
+            get_vulkan_target_triple,
+        )
+
+        if device == "vulkan":
+            vulkaninfo_list = get_all_vulkan_devices()
+            if vulkan_target_triple == "":
+                # We already have the device_id extracted via WebUI, so we directly use
+                # that to find the target triple.
+                vulkan_target_triple = get_vulkan_target_triple(
+                    vulkaninfo_list[device_id]
+                )
+            _extra_args.append(
+                f"-iree-vulkan-target-triple={vulkan_target_triple}"
+            )
+            if "rdna" in vulkan_target_triple:
+                flags_to_add = [
+                    "--iree-spirv-index-bits=64",
+                ]
+                _extra_args = _extra_args + flags_to_add
+
+            if device_id is None:
+                id = 0
+                for device in vulkaninfo_list:
+                    target_triple = get_vulkan_target_triple(
+                        vulkaninfo_list[id]
+                    )
+                    if target_triple == vulkan_target_triple:
+                        device_id = id
+                        break
+                    id += 1
+
+                assert (
+                    device_id
+                ), f"no vulkan hardware for target-triple '{vulkan_target_triple}' exists"
+            print(f"Will use vulkan target triple : {vulkan_target_triple}")
+
+        elif "rocm" in device:
+            # add iree rocm flags
+            _extra_args.append(
+                f"--iree-rocm-target-chip={args.iree_rocm_target_chip}"
+            )
+            print(f"extra args = {_extra_args}")
+
+        if model_name == "vicuna4":
+            vicuna_model = ShardedVicuna(
+                model_name,
+                hf_model_path=model_path,
+                device=device,
+                precision=precision,
+                max_num_tokens=max_toks,
+                compressed=True,
+                extra_args_cmd=_extra_args,
+            )
+        else:
+            #  if config_file is None:
+            vicuna_model = UnshardedVicuna(
+                model_name,
+                hf_model_path=model_path,
+                hf_auth_token=args.hf_auth_token,
+                device=device,
+                vulkan_target_triple=vulkan_target_triple,
+                precision=precision,
+                max_num_tokens=max_toks,
+                download_vmfb=download_vmfb,
+                load_mlir_from_shark_tank=True,
+                extra_args_cmd=_extra_args,
+                device_id=device_id,
+            )
+
+    if vicuna_model is None:
+        sys.exit("Unable to instantiate the model object, exiting.")
+
+    prompt = create_prompt(model_name, history, prompt_prefix)
+
+    partial_text = ""
     token_count = 0
     total_time = 0.001  # In order to avoid divide by zero error
     prefill_time = 0