Fix missing "thinking" key in Ollama message metadata when streaming.

models/spring-ai-ollama/src/main/java/org/springframework/ai/ollama/OllamaChatModel.java

@@ -345,12 +345,16 @@ private Flux<ChatResponse> internalStream(Prompt prompt, ChatResponse previousCh
 					.toolCalls(toolCalls)
 					.build();
 
-				ChatGenerationMetadata generationMetadata = ChatGenerationMetadata.NULL;
+				ChatGenerationMetadata.Builder generationMetadataBuilder = ChatGenerationMetadata.builder();
 				if (chunk.promptEvalCount() != null && chunk.evalCount() != null) {
-					generationMetadata = ChatGenerationMetadata.builder().finishReason(chunk.doneReason()).build();
+					generationMetadataBuilder.finishReason(chunk.doneReason());
 				}
 
-				var generator = new Generation(assistantMessage, generationMetadata);
+				if (chunk.message() != null && chunk.message().thinking() != null) {
+					generationMetadataBuilder.metadata("thinking", chunk.message().thinking());
+				}
+
+				var generator = new Generation(assistantMessage, generationMetadataBuilder.build());
 				return new ChatResponse(List.of(generator), from(chunk, previousChatResponse));
 			});
 

models/spring-ai-ollama/src/test/java/org/springframework/ai/ollama/OllamaChatModelMetadataTests.java

@@ -16,9 +16,12 @@
 
 package org.springframework.ai.ollama;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 import io.micrometer.observation.tck.TestObservationRegistry;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
 
 import org.springframework.ai.chat.metadata.ChatGenerationMetadata;
 import org.springframework.ai.chat.model.ChatResponse;
@@ -70,6 +73,60 @@ void ollamaThinkingMetadataCaptured() {
 		});
 	}
 
+	@Test
+	void ollamaThinkingMedataCapturedWhenStreaming() {
+		var options = OllamaChatOptions.builder().model(MODEL).enableThinking().build();
+		var response = new StringBuilder();
+		var thinking = new StringBuilder();
+		var foundThinking = new AtomicBoolean(false);
+
+		Prompt prompt = new Prompt("Why is the sky blue?", options);
+
+		Flux<ChatResponse> chatResponse = this.chatModel.stream(prompt);
+		var captured = chatResponse.collectList().block();
+
+		assertThat(captured).isNotEmpty();
+
+		captured.forEach(chunk -> {
+			ChatGenerationMetadata chatGenerationMetadata = chunk.getResult().getMetadata();
+			assertThat(chatGenerationMetadata).isNotNull();
+
+			if (chatGenerationMetadata.containsKey("thinking") && chatGenerationMetadata.get("thinking") != null) {
+				foundThinking.set(true);
+				thinking.append(chatGenerationMetadata.get("thinking").toString());
+			}
+
+			response.append(chunk.getResult().getOutput().getText());
+		});
+
+		assertThat(response.toString()).isNotEmpty();
+		assertThat(thinking.toString()).isNotEmpty();
+	}
+
+	@Test
+	void ollamaThinkingMedataNotCapturedWhenStreamingWhenSetThinkingToFalse() {
+		var options = OllamaChatOptions.builder().model(MODEL).disableThinking().build();
+		var response = new StringBuilder();
+
+		Prompt prompt = new Prompt("Why is the sky blue?", options);
+
+		Flux<ChatResponse> chatResponse = this.chatModel.stream(prompt);
+		var captured = chatResponse.collectList().block();
+
+		assertThat(captured).isNotEmpty();
+
+		captured.forEach(chunk -> {
+			ChatGenerationMetadata chatGenerationMetadata = chunk.getResult().getMetadata();
+			assertThat(chatGenerationMetadata).isNotNull();
+			var thinking = chatGenerationMetadata.get("thinking");
+			assertThat(thinking).isNull();
+
+			response.append(chunk.getResult().getOutput().getText());
+		});
+
+		assertThat(response.toString()).isNotEmpty();
+	}
+
 	@Test
 	void ollamaThinkingMetadataNotCapturedWhenSetThinkFlagToFalse() {
 		// Note: Thinking-capable models (e.g., qwen3:*) auto-enable thinking by default