diff --git a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClient.java b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClient.java
index 4091cdd36..e30df03ce 100644
--- a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClient.java
+++ b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClient.java
@@ -120,7 +120,7 @@ public class VertexAiGeminiChatClient
 	public VertexAiGeminiChatClient(VertexAI vertexAI) {
 		this(vertexAI,
 				VertexAiGeminiChatOptions.builder()
-					.withModel(ChatModel.GEMINI_PRO_VISION.getValue())
+					.withModel(ChatModel.GEMINI_PRO_VISION)
 					.withTemperature(0.8f)
 					.build());
 	}
diff --git a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
index 7d4e9875a..311ff16af 100644
--- a/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
+++ b/models/spring-ai-vertex-ai-gemini/src/main/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatOptions.java
@@ -28,6 +28,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import org.springframework.ai.chat.prompt.ChatOptions;
 import org.springframework.ai.model.function.FunctionCallback;
 import org.springframework.ai.model.function.FunctionCallingOptions;
+import org.springframework.ai.vertexai.gemini.VertexAiGeminiChatClient.ChatModel;
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
 import org.springframework.util.Assert;
 
@@ -144,6 +145,11 @@ public class VertexAiGeminiChatOptions implements FunctionCallingOptions, ChatOp
 			return this;
 		}
 
+		public Builder withModel(ChatModel model) {
+			this.options.setModel(model.getValue());
+			return this;
+		}
+
 		public Builder withFunctionCallbacks(List<FunctionCallback> functionCallbacks) {
 			this.options.functionCallbacks = functionCallbacks;
 			return this;
diff --git a/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClientIT.java b/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClientIT.java
index 9eff8981e..58f687eb4 100644
--- a/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClientIT.java
+++ b/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatClientIT.java
@@ -234,7 +234,7 @@ class VertexAiGeminiChatClientIT {
 		public VertexAiGeminiChatClient vertexAiEmbedding(VertexAI vertexAi) {
 			return new VertexAiGeminiChatClient(vertexAi,
 					VertexAiGeminiChatOptions.builder()
-						.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_VISION.getValue())
+						.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_VISION)
 						.build());
 		}
 
diff --git a/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/function/VertexAiGeminiChatClientFunctionCallingIT.java b/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/function/VertexAiGeminiChatClientFunctionCallingIT.java
index 2026729e3..d5209e82e 100644
--- a/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/function/VertexAiGeminiChatClientFunctionCallingIT.java
+++ b/models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/function/VertexAiGeminiChatClientFunctionCallingIT.java
@@ -98,8 +98,8 @@ public class VertexAiGeminiChatClientFunctionCallingIT {
 					""";
 
 		var promptOptions = VertexAiGeminiChatOptions.builder()
-			// .withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO.getValue())
-			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_1_5_PRO.getValue())
+			// .withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO)
+			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_1_5_PRO)
 			.withFunctionCallbacks(List.of(FunctionCallbackWrapper.builder(new MockWeatherService())
 				.withName("get_current_weather")
 				.withDescription("Get the current weather in a given location")
@@ -126,7 +126,7 @@ public class VertexAiGeminiChatClientFunctionCallingIT {
 		List<Message> messages = new ArrayList<>(List.of(userMessage));
 
 		var promptOptions = VertexAiGeminiChatOptions.builder()
-			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_1_5_PRO.getValue())
+			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO_1_5_PRO)
 			// .withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO.getValue())
 			.withFunctionCallbacks(List.of(
 					FunctionCallbackWrapper.builder(new MockWeatherService())
@@ -168,7 +168,7 @@ public class VertexAiGeminiChatClientFunctionCallingIT {
 		List<Message> messages = new ArrayList<>(List.of(userMessage));
 
 		var promptOptions = VertexAiGeminiChatOptions.builder()
-			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO.getValue())
+			.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO)
 			.withFunctionCallbacks(List.of(FunctionCallbackWrapper.builder(new MockWeatherService())
 				.withSchemaType(SchemaType.OPEN_API_SCHEMA)
 				.withName("getCurrentWeather")
@@ -227,7 +227,7 @@ public class VertexAiGeminiChatClientFunctionCallingIT {
 		public VertexAiGeminiChatClient vertexAiEmbedding(VertexAI vertexAi) {
 			return new VertexAiGeminiChatClient(vertexAi,
 					VertexAiGeminiChatOptions.builder()
-						.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO.getValue())
+						.withModel(VertexAiGeminiChatClient.ChatModel.GEMINI_PRO)
 						.withTemperature(0.9f)
 						.build());
 		}
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/images/vertex-ai-gemini-native-api.jpg b/spring-ai-docs/src/main/antora/modules/ROOT/images/vertex-ai-gemini-native-api.jpg
new file mode 100644
index 000000000..68b44f1bb
Binary files /dev/null and b/spring-ai-docs/src/main/antora/modules/ROOT/images/vertex-ai-gemini-native-api.jpg differ
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/anthropic-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/anthropic-chat.adoc
index 6bb187048..def68f7c2 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/anthropic-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/anthropic-chat.adoc
@@ -128,7 +128,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/AnthropicChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-anthropic/src/main/java/org/springframework/ai/anthropic/AnthropicChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Function Calling
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/azure-openai-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/azure-openai-chat.adoc
index 000d7f4c4..759aca404 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/azure-openai-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/azure-openai-chat.adoc
@@ -132,7 +132,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-azure-openai/src/main/java/org/springframework/ai/azure/openai/AzureOpenAiChatOptions.java[AzureOpenAiChatOptions.java] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-azure-openai/src/main/java/org/springframework/ai/azure/openai/AzureOpenAiChatOptions.java[AzureOpenAiChatOptions.java] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 
 == Function Calling
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic.adoc
index 806b5d9eb..d6fc03d60 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic.adoc
@@ -116,7 +116,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/anthropic/AnthropicChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/anthropic/AnthropicChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Sample Controller
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic3.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic3.adoc
index af1ac613a..3b4cd66af 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic3.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-anthropic3.adoc
@@ -113,7 +113,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/anthropic3/Anthropic3ChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/anthropic3/Anthropic3ChatOptions.java[AnthropicChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 
 == Multimodal
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-cohere.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-cohere.adoc
index 9f0c53592..8133f3bc2 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-cohere.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-cohere.adoc
@@ -109,7 +109,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/cohere/BedrockCohereChatOptions.java[BedrockCohereChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/cohere/BedrockCohereChatOptions.java[BedrockCohereChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Sample Controller
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-llama.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-llama.adoc
index 1d04b2b8f..435b71e47 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-llama.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-llama.adoc
@@ -107,7 +107,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/llama/BedrockLlamaChatOptions.java[BedrockLlamaChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/llama/BedrockLlamaChatOptions.java[BedrockLlamaChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Sample Controller
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-titan.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-titan.adoc
index 7ba332e67..38978fcfc 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-titan.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-titan.adoc
@@ -105,7 +105,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/titan/BedrockTitanChatOptions.java[BedrockTitanChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/titan/BedrockTitanChatOptions.java[BedrockTitanChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Sample Controller
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/mistralai-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/mistralai-chat.adoc
index a53638d7b..26fb6afee 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/mistralai-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/mistralai-chat.adoc
@@ -130,7 +130,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/MistralAiChatOptions.java[MistralAiChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/MistralAiChatOptions.java[MistralAiChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Function Calling
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/ollama-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/ollama-chat.adoc
index de61f8851..0fb32b997 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/ollama-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/ollama-chat.adoc
@@ -126,7 +126,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-ollama/src/main/java/org/springframework/ai/ollama/api/OllamaOptions.java[OllamaOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific link:https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-ollama/src/main/java/org/springframework/ai/ollama/api/OllamaOptions.java[OllamaOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 
 == Multimodal
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/openai-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/openai-chat.adoc
index 99fd64634..440a4a6b6 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/openai-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/openai-chat.adoc
@@ -134,7 +134,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatOptions.java[OpenAiChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiChatOptions.java[OpenAiChatOptions] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Function Calling
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-gemini-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-gemini-chat.adoc
index 3b4b8944e..ef66bcdf8 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-gemini-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-gemini-chat.adoc
@@ -65,7 +65,7 @@ The prefix `spring.ai.vertex.ai.gemini.chat` is the property prefix that lets yo
 |====
 | Property | Description | Default
 
-| spring.ai.vertex.ai.gemini.chat.options.model | This is the https://cloud.google.com/vertex-ai/docs/generative-ai/model-reference/gemini[Vertex AI Gemini Chat model] to use | gemini-pro-vision
+| spring.ai.vertex.ai.gemini.chat.options.model | Supported https://cloud.google.com/vertex-ai/docs/generative-ai/model-reference/gemini[Vertex AI Gemini Chat model] to use include the (1.0 ) `gemini-pro`, `gemini-pro-vision` and the new (1.5) `gemini-1.5-pro-preview-0514`, `gemini-1.5-flash-preview-0514` models. | gemini-pro-vision
 | spring.ai.vertex.ai.gemini.chat.options.temperature | Controls the randomness of the output. Values can range over [0.0,1.0], inclusive. A value closer to 1.0 will produce responses that are more varied, while a value closer to 0.0 will typically result in less surprising responses from the generative. This value specifies default to be used by the backend while making the call to the generative. | 0.8
 | spring.ai.vertex.ai.gemini.chat.options.topK | The maximum number of tokens to consider when sampling. The generative uses combined Top-k and nucleus sampling. Top-k sampling considers the set of topK most probable tokens. | -
 | spring.ai.vertex.ai.gemini.chat.options.topP | The maximum cumulative probability of tokens to consider when sampling. The generative uses combined Top-k and nucleus sampling. Nucleus sampling considers the smallest set of tokens whose probability sum is at least topP.  | -
@@ -100,7 +100,8 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific `VertexAiChatPaLm2Options` you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific `VertexAiChatPaLm2Options` you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the
+https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Function Calling
 
@@ -211,6 +212,7 @@ VertexAI vertexApi =  new VertexAI(projectId, location);
 
 var chatClient = new VertexAiGeminiChatClient(vertexApi,
     VertexAiGeminiChatOptions.builder()
+        .withModel(ChatModel.GEMINI_PRO_1_5_PRO)
         .withTemperature(0.4)
     .build());
 
@@ -221,3 +223,9 @@ ChatResponse response = chatClient.call(
 The `VertexAiGeminiChatOptions` provides the configuration information for the chat requests.
 The `VertexAiGeminiChatOptions.Builder` is fluent options builder.
 
+== Low-level Java Client [[low-level-api]]
+
+Following class diagram illustrates the Vertex AI Gemini native Java API:
+
+image::vertex-ai-gemini-native-api.jpg[w=800,align="center"]
+
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-palm2-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-palm2-chat.adoc
index f67a467f0..045df41e2 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-palm2-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/vertexai-palm2-chat.adoc
@@ -97,7 +97,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific `VertexAiPaLm2ChatOptions` you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific `VertexAiPaLm2ChatOptions` you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 == Sample Controller
 
diff --git a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/watsonx-ai-chat.adoc b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/watsonx-ai-chat.adoc
index 1cc4445f4..79ce3d8d9 100644
--- a/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/watsonx-ai-chat.adoc
+++ b/spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/watsonx-ai-chat.adoc
@@ -92,7 +92,7 @@ ChatResponse response = chatClient.call(
     ));
 ----
 
-TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-watsonx-ai/src/main/java/org/springframework/ai/watsonx/WatsonxAiChatOptions.java[WatsonxAiChatOptions.java] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
+TIP: In addition to the model specific https://github.com/spring-projects/spring-ai/blob/main/models/spring-ai-watsonx-ai/src/main/java/org/springframework/ai/watsonx/WatsonxAiChatOptions.java[WatsonxAiChatOptions.java] you can use a portable https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptions.java[ChatOptions] instance, created with the https://github.com/spring-projects/spring-ai/blob/main/spring-ai-core/src/main/java/org/springframework/ai/chat/prompt/ChatOptionsBuilder.java[ChatOptionsBuilder#builder()].
 
 NOTE: For more information go to https://dataplatform.cloud.ibm.com/docs/content/wsj/analyze-data/fm-model-parameters.html?context=wx[watsonx-parameters-info]