diff --git a/keep-ui/features/workflows/manual-run-workflow/ui/manual-run-workflow-modal.tsx b/keep-ui/features/workflows/manual-run-workflow/ui/manual-run-workflow-modal.tsx
index 60e3f232d0..d8ddbe0e01 100644
--- a/keep-ui/features/workflows/manual-run-workflow/ui/manual-run-workflow-modal.tsx
+++ b/keep-ui/features/workflows/manual-run-workflow/ui/manual-run-workflow-modal.tsx
@@ -48,6 +48,7 @@ export function ManualRunWorkflowModal({
   >(undefined);
   const [workflowInputs, setWorkflowInputs] = useState<WorkflowInput[]>([]);
   const [inputValues, setInputValues] = useState<Record<string, any>>({});
+  const [isRunning, setIsRunning] = useState(false);
   const { workflows } = useWorkflowsV2({
     ...DEFAULT_WORKFLOWS_QUERY,
     limit: 100, // Fetch more workflows at once for the dropdown
@@ -128,6 +129,10 @@ export function ManualRunWorkflowModal({
   };
 
   const handleRun = async () => {
+    if (isRunning) {
+      return;
+    }
+    setIsRunning(true);
     try {
       if (onSubmit) {
         // If onSubmit prop is provided, use it (for WorkflowDetailHeader usage)
@@ -161,10 +166,12 @@ export function ManualRunWorkflowModal({
           </div>
         );
       }
+      clearAndClose();
     } catch (error) {
       showErrorToast(error, "Failed to start workflow");
+    } finally {
+      setIsRunning(false);
     }
-    clearAndClose();
   };
 
   const WorkflowSelect = (props: any) => {
@@ -293,13 +300,20 @@ export function ManualRunWorkflowModal({
       ) : null}
 
       <div className="flex justify-end gap-2 mt-4">
-        <Button onClick={clearAndClose} color="orange" variant="secondary">
+        <Button
+          onClick={clearAndClose}
+          color="orange"
+          variant="secondary"
+          disabled={isRunning}
+        >
           Cancel
         </Button>
         <Button
           onClick={handleRun}
           color="orange"
+          loading={isRunning}
           disabled={
+            isRunning ||
             !effectiveWorkflow ||
             (workflowInputs.length > 0 &&
               !areRequiredInputsFilled(workflowInputs, inputValues))
diff --git a/keep/providers/grok_provider/grok_provider.py b/keep/providers/grok_provider/grok_provider.py
index 2cd1760a30..2801604038 100644
--- a/keep/providers/grok_provider/grok_provider.py
+++ b/keep/providers/grok_provider/grok_provider.py
@@ -45,7 +45,7 @@ def validate_scopes(self) -> dict[str, bool | str]:
     def _query(
         self,
         prompt,
-        model="grok-1",
+        model="grok-4.5",
         max_tokens=1024,
         structured_output_format=None,
     ):
@@ -71,7 +71,14 @@ def _query(
                 json=payload
             )
             response.raise_for_status()
-            content = response.json()["choices"][0]["message"]["content"]
+            result = response.json()
+            # An OpenAI-compatible backend can return HTTP 200 with an empty
+            # choices list (e.g. a content-filter block), so raise_for_status
+            # passes but choices[0] would raise. Degrade to an empty string.
+            try:
+                content = result["choices"][0]["message"]["content"]
+            except (KeyError, IndexError):
+                content = ""
 
             # Try to parse as JSON if structured output was requested
             if structured_output_format:
@@ -116,7 +123,7 @@ def _query(
     print(
         provider.query(
             prompt="Here is an alert, define environment for it: Clients are panicking, nothing works.",
-            model="grok-1",
+            model="grok-4.5",
             structured_output_format={
                 "type": "json_schema",
                 "json_schema": {
diff --git a/keep/providers/openai_provider/openai_provider.py b/keep/providers/openai_provider/openai_provider.py
index e7f58a2ade..be7460b15f 100644
--- a/keep/providers/openai_provider/openai_provider.py
+++ b/keep/providers/openai_provider/openai_provider.py
@@ -52,7 +52,7 @@ def validate_scopes(self) -> dict[str, bool | str]:
     def _query(
         self,
         prompt,
-        model="gpt-3.5-turbo",
+        model="gpt-4o-mini",
         max_tokens=1024,
         structured_output_format=None,
     ):
diff --git a/tests/providers/grok_provider/test_grok_default_model.py b/tests/providers/grok_provider/test_grok_default_model.py
new file mode 100644
index 0000000000..f80ce26575
--- /dev/null
+++ b/tests/providers/grok_provider/test_grok_default_model.py
@@ -0,0 +1,46 @@
+"""The Grok provider default model must be one the xAI API still serves.
+
+grok-1 is xAI's open-weights release, not a model the api.x.ai chat completions
+endpoint serves, so a call that relied on the default failed model-not-found.
+"""
+
+from unittest.mock import MagicMock, patch
+
+from keep.contextmanager.contextmanager import ContextManager
+from keep.providers.grok_provider.grok_provider import GrokProvider
+from keep.providers.models.provider_config import ProviderConfig
+
+# grok-1 is the open-weights release; the API never served it as a chat model.
+RETIRED_MODEL = "grok-1"
+
+
+def _build_provider() -> GrokProvider:
+    config = ProviderConfig(
+        description="Grok Provider",
+        authentication={"api_key": "test-key"},
+    )
+    return GrokProvider(ContextManager(tenant_id="test"), "grok-test", config)
+
+
+def _capture_post():
+    """Patch requests.post and return the mock so the sent payload can be read."""
+    response = MagicMock()
+    response.raise_for_status = MagicMock()
+    response.json = MagicMock(
+        return_value={"choices": [{"message": {"content": "ok"}}]}
+    )
+    return patch("requests.post", return_value=response)
+
+
+def test_default_model_is_not_the_retired_one():
+    provider = _build_provider()
+    with _capture_post() as post:
+        provider._query(prompt="hi")
+    assert post.call_args.kwargs["json"]["model"] != RETIRED_MODEL
+
+
+def test_default_model_is_a_served_model():
+    provider = _build_provider()
+    with _capture_post() as post:
+        provider._query(prompt="hi")
+    assert post.call_args.kwargs["json"]["model"] == "grok-4.5"
diff --git a/tests/providers/grok_provider/test_grok_response_parsing.py b/tests/providers/grok_provider/test_grok_response_parsing.py
new file mode 100644
index 0000000000..61aedc4e8d
--- /dev/null
+++ b/tests/providers/grok_provider/test_grok_response_parsing.py
@@ -0,0 +1,46 @@
+"""Tests for how the Grok provider parses a chat completion response.
+
+The xAI API is OpenAI-compatible, and OpenAI-compatible backends return HTTP 200
+with an empty ``choices`` list on a content-filter block. ``raise_for_status``
+passes, so the provider still has to read ``choices[0]`` and must not crash.
+"""
+
+from unittest.mock import MagicMock, patch
+
+from keep.contextmanager.contextmanager import ContextManager
+from keep.providers.grok_provider.grok_provider import GrokProvider
+from keep.providers.models.provider_config import ProviderConfig
+
+
+def _build_provider() -> GrokProvider:
+    config = ProviderConfig(
+        description="Grok Provider",
+        authentication={"api_key": "test-key"},
+    )
+    return GrokProvider(ContextManager(tenant_id="test"), "grok-test", config)
+
+
+def _response(payload) -> MagicMock:
+    response = MagicMock()
+    response.raise_for_status = MagicMock()
+    response.json = MagicMock(return_value=payload)
+    return response
+
+
+def test_empty_choices_does_not_crash():
+    provider = _build_provider()
+    with patch("requests.post", return_value=_response({"choices": []})):
+        assert provider._query(prompt="hi")["response"] == ""
+
+
+def test_missing_keys_do_not_crash():
+    provider = _build_provider()
+    with patch("requests.post", return_value=_response({})):
+        assert provider._query(prompt="hi")["response"] == ""
+
+
+def test_normal_response_is_returned():
+    provider = _build_provider()
+    payload = {"choices": [{"message": {"content": "hello"}}]}
+    with patch("requests.post", return_value=_response(payload)):
+        assert provider._query(prompt="hi")["response"] == "hello"
diff --git a/tests/providers/openai_provider/test_openai_default_model.py b/tests/providers/openai_provider/test_openai_default_model.py
new file mode 100644
index 0000000000..3d0f0ba4d6
--- /dev/null
+++ b/tests/providers/openai_provider/test_openai_default_model.py
@@ -0,0 +1,51 @@
+"""The OpenAI provider default model must support the json_schema response format.
+
+_query passes response_format=structured_output_format (a json_schema) to
+chat.completions.create. json_schema is only supported on gpt-4o-mini and later, so
+gpt-3.5-turbo could not serve a structured-output call that relied on the default.
+"""
+
+from unittest.mock import MagicMock, patch
+
+from keep.contextmanager.contextmanager import ContextManager
+from keep.providers.models.provider_config import ProviderConfig
+from keep.providers.openai_provider.openai_provider import OpenaiProvider
+
+# gpt-3.5-turbo does not support the json_schema response format the provider sends.
+UNSUPPORTED_MODEL = "gpt-3.5-turbo"
+
+
+def _build_provider() -> OpenaiProvider:
+    config = ProviderConfig(
+        description="OpenAI Provider",
+        authentication={"api_key": "test-key"},
+    )
+    return OpenaiProvider(ContextManager(tenant_id="test"), "openai-test", config)
+
+
+def _patched_client():
+    """Patch the OpenAI client so the model used in the request can be captured."""
+    client = MagicMock()
+    message = MagicMock()
+    message.content = "ok"
+    client.chat.completions.create.return_value.choices = [MagicMock(message=message)]
+    return patch(
+        "keep.providers.openai_provider.openai_provider.OpenAI",
+        return_value=client,
+    ), client
+
+
+def test_default_model_is_not_the_unsupported_one():
+    provider = _build_provider()
+    p, client = _patched_client()
+    with p:
+        provider._query(prompt="hi")
+    assert client.chat.completions.create.call_args.kwargs["model"] != UNSUPPORTED_MODEL
+
+
+def test_default_model_supports_json_schema():
+    provider = _build_provider()
+    p, client = _patched_client()
+    with p:
+        provider._query(prompt="hi")
+    assert client.chat.completions.create.call_args.kwargs["model"] == "gpt-4o-mini"