diff --git a/llm/aicore.go b/llm/aicore.go
index 3722d50..ed58d43 100644
--- a/llm/aicore.go
+++ b/llm/aicore.go
@@ -253,7 +253,7 @@ func (c *AICoreClient) CompleteAnthropic(ctx context.Context, model string, mess
 	}
 
 	reqBody := anthropicRequest{
-		// AnthropicVersion omitted - SAP AI Core does not accept it in body
+		AnthropicVersion: "bedrock-2023-05-31", // SAP AI Core uses Bedrock format
 		// Model omitted - AI Core deployment already specifies model
 		MaxTokens: maxTokens,
 		System:    system,
diff --git a/llm/aicore_test.go b/llm/aicore_test.go
index 7f11da3..a59026f 100644
--- a/llm/aicore_test.go
+++ b/llm/aicore_test.go
@@ -206,8 +206,8 @@ func TestAICoreClient_CompleteAnthropic(t *testing.T) {
 		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 			t.Fatalf("decode request: %v", err)
 		}
-		if req.MaxTokens == 0 {
-			t.Errorf("expected max_tokens in request")
+		if req.AnthropicVersion != "bedrock-2023-05-31" {
+			t.Errorf("expected bedrock anthropic_version in request")
 		}
 		if req.System != "You are helpful" {
 			t.Errorf("expected system prompt: %q", req.System)