diff --git a/packages/vertex_ai/lib/src/gen_ai/models/model.dart b/packages/vertex_ai/lib/src/gen_ai/models/model.dart
index de1ce1d8..77fa8d5c 100644
--- a/packages/vertex_ai/lib/src/gen_ai/models/model.dart
+++ b/packages/vertex_ai/lib/src/gen_ai/models/model.dart
@@ -110,7 +110,8 @@ class VertexAIPredictionSafetyAttributes {
     final Map<String, dynamic> safetyAttributesJson,
   ) {
     return VertexAIPredictionSafetyAttributes(
-      categories: (safetyAttributesJson['categories'] as List<dynamic>)
+      categories: (safetyAttributesJson['categories'] as List<dynamic>? ??
+              const [])
           .map(
             (final category) => switch (category) {
               'Derogatory' =>
@@ -142,7 +143,7 @@ class VertexAIPredictionSafetyAttributes {
           .toList(growable: false),
       scores:
           (safetyAttributesJson['scores'] as List<dynamic>? ?? const []).cast(),
-      blocked: safetyAttributesJson['blocked'] as bool,
+      blocked: safetyAttributesJson['blocked'] as bool? ?? false,
     );
   }
 
diff --git a/packages/vertex_ai/lib/src/gen_ai/models/text.dart b/packages/vertex_ai/lib/src/gen_ai/models/text.dart
index d4ee80bc..e908ad06 100644
--- a/packages/vertex_ai/lib/src/gen_ai/models/text.dart
+++ b/packages/vertex_ai/lib/src/gen_ai/models/text.dart
@@ -52,7 +52,7 @@ class VertexAITextModelRequestParams {
     this.maxOutputTokens = 1024,
     this.topP = 0.95,
     this.topK = 40,
-    this.stopSequence = const [],
+    this.stopSequences = const [],
     this.candidateCount = 1,
   });
 
@@ -114,7 +114,7 @@ class VertexAITextModelRequestParams {
   /// if one of the strings is encountered in the response. If a string appears
   /// multiple times in the response, then the response truncates where it's
   /// first encountered. The strings are case-sensitive.
-  final List<String> stopSequence;
+  final List<String> stopSequences;
 
   /// The number of response variations to return.
   final int candidateCount;
@@ -126,7 +126,7 @@ class VertexAITextModelRequestParams {
       'maxOutputTokens': maxOutputTokens,
       'topP': topP,
       'topK': topK,
-      'stopSequence': stopSequence,
+      'stopSequences': stopSequences,
       'candidateCount': candidateCount,
     };
   }
@@ -140,8 +140,8 @@ class VertexAITextModelRequestParams {
           topP == other.topP &&
           topK == other.topK &&
           const ListEquality<String>().equals(
-            stopSequence,
-            other.stopSequence,
+            stopSequences,
+            other.stopSequences,
           ) &&
           candidateCount == other.candidateCount;
 
@@ -151,7 +151,7 @@ class VertexAITextModelRequestParams {
       maxOutputTokens.hashCode ^
       topP.hashCode ^
       topK.hashCode ^
-      const ListEquality<String>().hash(stopSequence) ^
+      const ListEquality<String>().hash(stopSequences) ^
       candidateCount.hashCode;
 
   @override
@@ -161,7 +161,7 @@ class VertexAITextModelRequestParams {
         'maxOutputTokens: $maxOutputTokens, '
         'topP: $topP, '
         'topK: $topK, '
-        'stopSequence: $stopSequence, '
+        'stopSequence: $stopSequences, '
         'candidateCount: $candidateCount}';
   }
 }
@@ -231,7 +231,7 @@ class VertexAITextModelPrediction {
     final Map<String, dynamic> predictionJson,
   ) {
     final citationMetadata =
-        predictionJson['citationMetadata'] as Map<String, dynamic>;
+        predictionJson['citationMetadata'] as Map<String, dynamic>? ?? const {};
     final citations =
         citationMetadata['citations'] as List<dynamic>? ?? const [];
     return VertexAITextModelPrediction(
diff --git a/packages/vertex_ai/lib/src/gen_ai/models/text_chat.dart b/packages/vertex_ai/lib/src/gen_ai/models/text_chat.dart
index ce10a345..b9790e28 100644
--- a/packages/vertex_ai/lib/src/gen_ai/models/text_chat.dart
+++ b/packages/vertex_ai/lib/src/gen_ai/models/text_chat.dart
@@ -98,7 +98,7 @@ class VertexAITextChatModelRequestParams {
     this.maxOutputTokens = 1024,
     this.topP = 0.95,
     this.topK = 40,
-    this.stopSequence = const [],
+    this.stopSequences = const [],
     this.candidateCount = 1,
   });
 
@@ -160,7 +160,7 @@ class VertexAITextChatModelRequestParams {
   /// if one of the strings is encountered in the response. If a string appears
   /// multiple times in the response, then the response truncates where it's
   /// first encountered. The strings are case-sensitive.
-  final List<String> stopSequence;
+  final List<String> stopSequences;
 
   /// The number of response variations to return.
   final int candidateCount;
@@ -172,7 +172,7 @@ class VertexAITextChatModelRequestParams {
       'maxOutputTokens': maxOutputTokens,
       'topP': topP,
       'topK': topK,
-      'stopSequence': stopSequence,
+      'stopSequences': stopSequences,
       'candidateCount': candidateCount,
     };
   }
@@ -186,8 +186,8 @@ class VertexAITextChatModelRequestParams {
           topP == other.topP &&
           topK == other.topK &&
           const ListEquality<String>().equals(
-            stopSequence,
-            other.stopSequence,
+            stopSequences,
+            other.stopSequences,
           ) &&
           candidateCount == other.candidateCount;
 
@@ -197,7 +197,7 @@ class VertexAITextChatModelRequestParams {
       maxOutputTokens.hashCode ^
       topP.hashCode ^
       topK.hashCode ^
-      const ListEquality<String>().hash(stopSequence) ^
+      const ListEquality<String>().hash(stopSequences) ^
       candidateCount.hashCode;
 
   @override
@@ -207,7 +207,7 @@ class VertexAITextChatModelRequestParams {
         'maxOutputTokens: $maxOutputTokens, '
         'topP: $topP, '
         'topK: $topK, '
-        'stopSequence: $stopSequence, '
+        'stopSequence: $stopSequences, '
         'candidateCount: $candidateCount}';
   }
 }
diff --git a/packages/vertex_ai/test/gen_ai/gen_ai_client_test.dart b/packages/vertex_ai/test/gen_ai/gen_ai_client_test.dart
index ae0509f4..4be6c08b 100644
--- a/packages/vertex_ai/test/gen_ai/gen_ai_client_test.dart
+++ b/packages/vertex_ai/test/gen_ai/gen_ai_client_test.dart
@@ -32,6 +32,28 @@ void main() async {
       }
     });
 
+    test('Test VertexAITextModelApi stop sequence', () async {
+      final res = await vertexAi.text.predict(
+        prompt:
+            'List the numbers from 1 to 9 in order without any spaces or commas.',
+        parameters: const VertexAITextModelRequestParams(
+          stopSequences: ['4'],
+        ),
+      );
+      expect(res.predictions.first.content, contains('123'));
+    });
+
+    test('Test VertexAITextModelApi candidates count', () async {
+      final res = await vertexAi.text.predict(
+        prompt: 'Suggest a name for a LLM framework for Dart',
+        parameters: const VertexAITextModelRequestParams(
+          temperature: 1,
+          candidateCount: 3,
+        ),
+      );
+      expect(res.predictions.length, 3);
+    });
+
     test('Test VertexAIChatModelApi', () async {
       final models = ['chat-bison', 'chat-bison-32k'];
 
diff --git a/packages/vertex_ai/test/gen_ai/mappers/chat_test.dart b/packages/vertex_ai/test/gen_ai/mappers/chat_test.dart
index d5fa6a2b..f7bf56fc 100644
--- a/packages/vertex_ai/test/gen_ai/mappers/chat_test.dart
+++ b/packages/vertex_ai/test/gen_ai/mappers/chat_test.dart
@@ -31,7 +31,7 @@ void main() {
           maxOutputTokens: 256,
           topP: 0.1,
           topK: 30,
-          stopSequence: ['STOP'],
+          stopSequences: ['STOP'],
           candidateCount: 10,
         ),
       );
@@ -64,7 +64,7 @@ void main() {
           'maxOutputTokens': 256,
           'topP': 0.1,
           'topK': 30,
-          'stopSequence': ['STOP'],
+          'stopSequences': ['STOP'],
           'candidateCount': 10,
         },
       );
diff --git a/packages/vertex_ai/test/gen_ai/mappers/text_test.dart b/packages/vertex_ai/test/gen_ai/mappers/text_test.dart
index 95ec76b5..6e45862a 100644
--- a/packages/vertex_ai/test/gen_ai/mappers/text_test.dart
+++ b/packages/vertex_ai/test/gen_ai/mappers/text_test.dart
@@ -13,7 +13,7 @@ void main() {
           maxOutputTokens: 256,
           topP: 0.1,
           topK: 30,
-          stopSequence: ['STOP'],
+          stopSequences: ['STOP'],
           candidateCount: 10,
         ),
       );
@@ -28,7 +28,7 @@ void main() {
           'maxOutputTokens': 256,
           'topP': 0.1,
           'topK': 30,
-          'stopSequence': ['STOP'],
+          'stopSequences': ['STOP'],
           'candidateCount': 10,
         },
       );