diff --git a/langchain4j-agentic/src/main/java/dev/langchain4j/agentic/agent/AgentBuilder.java b/langchain4j-agentic/src/main/java/dev/langchain4j/agentic/agent/AgentBuilder.java
index 74ae2176a8..830f01fd01 100644
--- a/langchain4j-agentic/src/main/java/dev/langchain4j/agentic/agent/AgentBuilder.java
+++ b/langchain4j-agentic/src/main/java/dev/langchain4j/agentic/agent/AgentBuilder.java
@@ -219,7 +219,11 @@ public class AgentBuilder<T, B extends AgentBuilder<T, ?>> {
                 aiServices.chatRequestTransformer(
                         new Context.AgenticScopeContextGenerator(agenticScope, contextProvider));
             } else {
-                aiServices.chatRequestTransformer(new Context.Summarizer(agenticScope, model, contextProvidingAgents));
+                ChatModel summarizerModel = model;
+                if (summarizerModel == null && chatModelProvider != null) {
+                    summarizerModel = chatModelProvider.apply(agenticScope);
+                }
+                aiServices.chatRequestTransformer(new Context.Summarizer(agenticScope, summarizerModel, contextProvidingAgents));
             }
         }
 
diff --git a/langchain4j-agentic/src/test/java/dev/langchain4j/agentic/DeclarativeAgentIT.java b/langchain4j-agentic/src/test/java/dev/langchain4j/agentic/DeclarativeAgentIT.java
index 2dfea789e8..0d1f07d054 100644
--- a/langchain4j-agentic/src/test/java/dev/langchain4j/agentic/DeclarativeAgentIT.java
+++ b/langchain4j-agentic/src/test/java/dev/langchain4j/agentic/DeclarativeAgentIT.java
@@ -1193,4 +1193,48 @@ public class DeclarativeAgentIT {
         assertThat(result.agenticScope().readState("cityData", "")).contains("Rome");
         assertThat(result.result()).containsIgnoringCase("Rome");
     }
+
+    public interface ProducerAgent {
+
+        @UserMessage("Provide a brief analysis of: {{request}}")
+        @Agent(description = "A producer agent", outputKey = "analysis")
+        String produce(@V("request") String request);
+
+        @ChatModelSupplier
+        static ChatModel chatModel() {
+            return baseModel();
+        }
+    }
+
+    public interface ConsumerWithScopeDependentSupplier {
+
+        @UserMessage("You are an expert. The user request is {{request}}.")
+        @Agent(
+                description = "An expert that summarizes context from other agents",
+                outputKey = "response",
+                summarizedContext = {"produce"})
+        String consume(@V("request") String request);
+
+        @ChatModelSupplier
+        static ChatModel chatModel(AgenticScope scope) {
+            return baseModel();
+        }
+    }
+
+    public interface SummarizedContextWithScopeSupplierPipeline {
+
+        @SequenceAgent(
+                outputKey = "response",
+                subAgents = {ProducerAgent.class, ConsumerWithScopeDependentSupplier.class})
+        String process(@V("request") String request);
+    }
+
+    @Test
+    void summarizedContext_with_scope_dependent_chatModelSupplier_should_not_throw() {
+        SummarizedContextWithScopeSupplierPipeline pipeline =
+                AgenticServices.createAgenticSystem(SummarizedContextWithScopeSupplierPipeline.class);
+
+        String response = pipeline.process("test request");
+        assertThat(response).isNotBlank();
+    }
 }