diff --git a/README.md b/README.md
index 00444dba..622b823a 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ For example, with just a few lines of code, you can access Gemini's multimodal c
 
 ```kotlin
 val generativeModel = GenerativeModel(
-    modelName = "gemini-pro-vision",
+    modelName = "gemini-1.0-pro-vision-latest",
     apiKey = BuildConfig.apiKey
 )
 
diff --git a/generativeai-android-sample/app/src/main/kotlin/com/google/ai/sample/GenerativeAiViewModelFactory.kt b/generativeai-android-sample/app/src/main/kotlin/com/google/ai/sample/GenerativeAiViewModelFactory.kt
index 007606bc..ff0b98d4 100644
--- a/generativeai-android-sample/app/src/main/kotlin/com/google/ai/sample/GenerativeAiViewModelFactory.kt
+++ b/generativeai-android-sample/app/src/main/kotlin/com/google/ai/sample/GenerativeAiViewModelFactory.kt
@@ -40,7 +40,7 @@ val GenerativeViewModelFactory = object : ViewModelProvider.Factory {
                     // Initialize a GenerativeModel with the `gemini-pro` AI model
                     // for text generation
                     val generativeModel = GenerativeModel(
-                        modelName = "gemini-pro",
+                        modelName = "gemini-1.0-pro",
                         apiKey = BuildConfig.apiKey,
                         generationConfig = config
                     )
@@ -51,7 +51,7 @@ val GenerativeViewModelFactory = object : ViewModelProvider.Factory {
                     // Initialize a GenerativeModel with the `gemini-pro-vision` AI model
                     // for multimodal text generation
                     val generativeModel = GenerativeModel(
-                        modelName = "gemini-pro-vision",
+                        modelName = "gemini-1.0-pro-vision-latest",
                         apiKey = BuildConfig.apiKey,
                         generationConfig = config
                     )
@@ -61,7 +61,7 @@ val GenerativeViewModelFactory = object : ViewModelProvider.Factory {
                 isAssignableFrom(ChatViewModel::class.java) -> {
                     // Initialize a GenerativeModel with the `gemini-pro` AI model for chat
                     val generativeModel = GenerativeModel(
-                        modelName = "gemini-pro",
+                        modelName = "gemini-1.0-pro",
                         apiKey = BuildConfig.apiKey,
                         generationConfig = config
                     )
diff --git a/generativeai/src/main/java/com/google/ai/client/generativeai/Chat.kt b/generativeai/src/main/java/com/google/ai/client/generativeai/Chat.kt
index 2abe4b72..b536c244 100644
--- a/generativeai/src/main/java/com/google/ai/client/generativeai/Chat.kt
+++ b/generativeai/src/main/java/com/google/ai/client/generativeai/Chat.kt
@@ -73,7 +73,7 @@ class Chat(private val model: GenerativeModel, val history: MutableList<Content>
    * @throws InvalidStateException if the [Chat] instance has an active request.
    */
   suspend fun sendMessage(prompt: String): GenerateContentResponse {
-    val content = content("user") { text(prompt) }
+    val content = content { text(prompt) }
     return sendMessage(content)
   }
 
@@ -84,7 +84,7 @@ class Chat(private val model: GenerativeModel, val history: MutableList<Content>
    * @throws InvalidStateException if the [Chat] instance has an active request.
    */
   suspend fun sendMessage(prompt: Bitmap): GenerateContentResponse {
-    val content = content("user") { image(prompt) }
+    val content = content { image(prompt) }
     return sendMessage(content)
   }
 
@@ -150,7 +150,7 @@ class Chat(private val model: GenerativeModel, val history: MutableList<Content>
    * @throws InvalidStateException if the [Chat] instance has an active request.
    */
   fun sendMessageStream(prompt: String): Flow<GenerateContentResponse> {
-    val content = content("user") { text(prompt) }
+    val content = content { text(prompt) }
     return sendMessageStream(content)
   }
 
@@ -162,7 +162,7 @@ class Chat(private val model: GenerativeModel, val history: MutableList<Content>
    * @throws InvalidStateException if the [Chat] instance has an active request.
    */
   fun sendMessageStream(prompt: Bitmap): Flow<GenerateContentResponse> {
-    val content = content("user") { image(prompt) }
+    val content = content { image(prompt) }
     return sendMessageStream(content)
   }
 
diff --git a/generativeai/src/main/java/com/google/ai/client/generativeai/internal/api/shared/Types.kt b/generativeai/src/main/java/com/google/ai/client/generativeai/internal/api/shared/Types.kt
index 3f15f807..8f7e2242 100644
--- a/generativeai/src/main/java/com/google/ai/client/generativeai/internal/api/shared/Types.kt
+++ b/generativeai/src/main/java/com/google/ai/client/generativeai/internal/api/shared/Types.kt
@@ -40,7 +40,7 @@ internal enum class HarmCategory {
 
 typealias Base64 = String
 
-@Serializable internal data class Content(val role: String? = null, val parts: List<Part>)
+@Serializable internal data class Content(val role: String? = "user", val parts: List<Part>)
 
 @Serializable(PartSerializer::class) internal sealed interface Part