diff --git a/lit_nlp/examples/models/t5.py b/lit_nlp/examples/models/t5.py
index b3a22cea..d21d0d05 100644
--- a/lit_nlp/examples/models/t5.py
+++ b/lit_nlp/examples/models/t5.py
@@ -46,6 +46,17 @@ class T5ModelConfig(object):
   token_top_k: int = 10
   output_attention: bool = False
 
+  @classmethod
+  def init_spec(cls) -> lit_types.Spec:
+    return {
+        "inference_batch_size": lit_types.Integer(default=4, required=False),
+        "beam_size": lit_types.Integer(default=4, required=False),
+        "max_gen_length": lit_types.Integer(default=50, required=False),
+        "num_to_generate": lit_types.Integer(default=1, required=False),
+        "token_top_k": lit_types.Integer(default=10, required=False),
+        "output_attention": lit_types.Boolean(default=False, required=False),
+    }
+
 
 def validate_t5_model(model: lit_model.Model) -> lit_model.Model:
   """Validate that a given model looks like a T5 model.
@@ -112,6 +123,13 @@ def predict_minibatch(self, inputs):
         "output_text": m.decode("utf-8")
     } for m in model_outputs["outputs"].numpy()]
 
+  @classmethod
+  def init_spec(cls) -> lit_types.Spec:
+    return {
+        "saved_model_path": lit_types.String(),
+        **T5ModelConfig.init_spec(),
+    }
+
   def input_spec(self):
     return {
         "input_text": lit_types.TextSegment(),
@@ -314,6 +332,13 @@ def predict_minibatch(self, inputs):
     unbatched_outputs = utils.unbatch_preds(detached_outputs)
     return list(map(self._postprocess, unbatched_outputs))
 
+  @classmethod
+  def init_spec(cls) -> lit_types.Spec:
+    return {
+        "model_name": lit_types.String(default="t5-small", required=False),
+        **T5ModelConfig.init_spec(),
+    }
+
   def input_spec(self):
     return {
         "input_text": lit_types.TextSegment(),
diff --git a/lit_nlp/examples/t5_demo.py b/lit_nlp/examples/t5_demo.py
index 17c546b2..982d7306 100644
--- a/lit_nlp/examples/t5_demo.py
+++ b/lit_nlp/examples/t5_demo.py
@@ -21,6 +21,7 @@
 from absl import flags
 from absl import logging
 
+from lit_nlp import app as lit_app
 from lit_nlp import dev_server
 from lit_nlp import server_flags
 from lit_nlp.api import dataset as lit_dataset
@@ -148,7 +149,13 @@ def main(argv: Sequence[str]) -> Optional[dev_server.LitServerType]:
           model_name=model_name_or_path,
           num_to_generate=_NUM_TO_GEN.value,
           token_top_k=_TOKEN_TOP_K.value,
-          output_attention=False)
+          output_attention=False,
+      )
+
+  model_loaders: lit_app.ModelLoadersMap = {
+      "T5 Saved Model": (t5.T5SavedModel, t5.T5SavedModel.init_spec()),
+      "T5 HF Model": (t5.T5HFModel, t5.T5HFModel.init_spec()),
+  }
 
   ##
   # Load eval sets and model wrappers for each task.
@@ -156,7 +163,7 @@ def main(argv: Sequence[str]) -> Optional[dev_server.LitServerType]:
   # and post-processing code.
   models = {}
   datasets = {}
-
+  dataset_loaders: lit_app.DatasetLoadersMap = {}
   if "summarization" in _TASKS.value:
     for k, m in base_models.items():
       models[k + "_summarization"] = t5.SummarizationWrapper(m)
@@ -167,6 +174,11 @@ def main(argv: Sequence[str]) -> Optional[dev_server.LitServerType]:
       datasets["CNNDM"] = summarization.CNNDMData(
           split="validation", max_examples=_MAX_EXAMPLES.value)
 
+    dataset_loaders["CNN DailyMail"] = (
+        summarization.CNNDMData,
+        summarization.CNNDMData.init_spec(),
+    )
+
   if "mt" in _TASKS.value:
     for k, m in base_models.items():
       models[k + "_translation"] = t5.TranslationWrapper(m)
@@ -183,6 +195,8 @@ def main(argv: Sequence[str]) -> Optional[dev_server.LitServerType]:
     else:
       datasets["wmt14_enfr"] = mt.WMT14Data(version="fr-en", reverse=True)
 
+    dataset_loaders["WMT 14"] = (mt.WMT14Data, mt.WMT14Data.init_spec())
+
   # Truncate datasets if --max_examples is set.
   for name in datasets:
     logging.info("Dataset: '%s' with %d examples", name, len(datasets[name]))
@@ -207,7 +221,13 @@ def main(argv: Sequence[str]) -> Optional[dev_server.LitServerType]:
   # Actually start the LIT server, using the models, datasets, and other
   # components constructed above.
   lit_demo = dev_server.Server(
-      models, datasets, generators=generators, **server_flags.get_flags())
+      models,
+      datasets,
+      generators=generators,
+      model_loaders=model_loaders,
+      dataset_loaders=dataset_loaders,
+      **server_flags.get_flags(),
+  )
   return lit_demo.serve()