diff --git a/cog_safe_push/config.py b/cog_safe_push/config.py
index 66c9565..902b753 100644
--- a/cog_safe_push/config.py
+++ b/cog_safe_push/config.py
@@ -1,6 +1,6 @@
 import argparse
 
-from pydantic import BaseModel, model_validator
+from pydantic import BaseModel, ConfigDict, model_validator
 
 from .exceptions import ArgumentError
 
@@ -11,6 +11,8 @@
 
 
 class TestCase(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
     inputs: dict[str, InputScalar]
     exact_string: str | None = None
     match_url: str | None = None
@@ -30,6 +32,8 @@ def check_mutually_exclusive(self):
 
 
 class FuzzConfig(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
     fixed_inputs: dict[str, InputScalar] = {}
     disabled_inputs: list[str] = []
     duration: int = DEFAULT_FUZZ_DURATION
@@ -37,6 +41,8 @@ class FuzzConfig(BaseModel):
 
 
 class PredictConfig(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
     compare_outputs: bool = True
     predict_timeout: int = DEFAULT_PREDICT_TIMEOUT
     test_cases: list[TestCase] = []
@@ -44,6 +50,8 @@ class PredictConfig(BaseModel):
 
 
 class TrainConfig(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
     destination: str | None = None
     destination_hardware: str = "cpu"
     train_timeout: int = DEFAULT_PREDICT_TIMEOUT
@@ -52,6 +60,8 @@ class TrainConfig(BaseModel):
 
 
 class Config(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
     model: str
     test_model: str | None = None
     test_hardware: str = "cpu"
diff --git a/cog_safe_push/main.py b/cog_safe_push/main.py
index afbd4f6..15f9fb0 100644
--- a/cog_safe_push/main.py
+++ b/cog_safe_push/main.py
@@ -177,6 +177,9 @@ def run_config(config: Config, no_push: bool):
     model_owner, model_name = parse_model(config.model)
     test_model_owner, test_model_name = parse_model(config.test_model)
 
+    # small optimization
+    reuse_test_model = None
+
     if config.train:
         # Don't push twice in case train and predict are both defined
         has_predict = config.predict is not None
@@ -191,7 +194,7 @@ def run_config(config: Config, no_push: bool):
             fuzz = FuzzConfig(
                 fixed_inputs={}, disabled_inputs=[], duration=0, iterations=0
             )
-        cog_safe_push(
+        reuse_test_model = cog_safe_push(
             model_owner=model_owner,
             model_name=model_name,
             test_model_owner=test_model_owner,
@@ -232,6 +235,7 @@ def run_config(config: Config, no_push: bool):
             fuzz_disabled_inputs=fuzz.disabled_inputs,
             fuzz_seconds=fuzz.duration,
             fuzz_iterations=fuzz.iterations,
+            reuse_test_model=reuse_test_model,
         )
 
 
@@ -253,6 +257,7 @@ def cog_safe_push(
     fuzz_disabled_inputs: list = [],
     fuzz_seconds: int = 30,
     fuzz_iterations: int | None = None,
+    reuse_test_model: Model | None = None,
 ):
     if model_owner == test_model_owner and model_name == test_model_name:
         raise ArgumentError("Can't use the same model as test model")
@@ -278,7 +283,12 @@ def cog_safe_push(
             f"You need to create the model {model_owner}/{model_name} before running this script"
         )
 
-    test_model = get_or_create_model(test_model_owner, test_model_name, test_hardware)
+    if reuse_test_model:
+        test_model = reuse_test_model
+    else:
+        test_model = get_or_create_model(
+            test_model_owner, test_model_name, test_hardware
+        )
 
     if train:
         train_destination = get_or_create_model(
@@ -287,12 +297,13 @@ def cog_safe_push(
     else:
         train_destination = None
 
-    log.info("Pushing test model")
-    pushed_version_id = cog.push(test_model)
-    test_model.reload()
-    assert (
-        test_model.versions.list()[0].id == pushed_version_id
-    ), f"Pushed version ID {pushed_version_id} doesn't match latest version on {test_model_owner}/{test_model_name}: {test_model.versions.list()[0].id}"
+    if not reuse_test_model:
+        log.info("Pushing test model")
+        pushed_version_id = cog.push(test_model)
+        test_model.reload()
+        assert (
+            test_model.versions.list()[0].id == pushed_version_id
+        ), f"Pushed version ID {pushed_version_id} doesn't match latest version on {test_model_owner}/{test_model_name}: {test_model.versions.list()[0].id}"
 
     log.info("Linting test model schema")
     schema.lint(test_model, train=train)
@@ -359,6 +370,8 @@ def cog_safe_push(
         log.info("Pushing model...")
         cog.push(model)
 
+    return test_model  # for reuse
+
 
 def parse_inputs(inputs_list: list[str]) -> dict[str, Any]:
     inputs = {}
diff --git a/cog_safe_push/predict.py b/cog_safe_push/predict.py
index 3822a54..2c29295 100644
--- a/cog_safe_push/predict.py
+++ b/cog_safe_push/predict.py
@@ -339,6 +339,8 @@ def predict(
             version=model.versions.list()[0].id, input=inputs
         )
 
+    log.vv(f"Prediction URL: https://replicate.com/p/{prediction.id}")
+
     start_time = time.time()
     while prediction.status not in ["succeeded", "failed", "canceled"]:
         time.sleep(0.5)