diff --git a/web/backend/api/model_status.go b/web/backend/api/model_status.go
index cb27a8207..98bd501f5 100644
--- a/web/backend/api/model_status.go
+++ b/web/backend/api/model_status.go
@@ -193,30 +193,18 @@ func runLocalModelProbe(m *config.ModelConfig) bool {
 func modelProbeCacheKey(m *config.ModelConfig) string {
 	protocol, modelID := splitModel(m.Model)
 
-	modelName := strings.ToLower(strings.TrimSpace(m.ModelName))
 	apiBaseRaw := modelProbeAPIBase(m)
 	apiBase := strings.ToLower(strings.TrimRight(strings.TrimSpace(apiBaseRaw), "/"))
-	authMethod := strings.ToLower(strings.TrimSpace(m.AuthMethod))
-	connectMode := strings.ToLower(strings.TrimSpace(m.ConnectMode))
 	apiKeyFingerprint := modelProbeAPIKeyFingerprint(m.APIKey())
 
 	var b strings.Builder
-	b.Grow(
-		len(modelName) + len(protocol) + len(modelID) + len(apiBase) + len(authMethod) +
-			len(connectMode) + len(apiKeyFingerprint) + 8,
-	)
-	b.WriteString(modelName)
-	b.WriteByte('|')
+	b.Grow(len(protocol) + len(modelID) + len(apiBase) + len(apiKeyFingerprint) + 8)
 	b.WriteString(protocol)
 	b.WriteByte('|')
 	b.WriteString(modelID)
 	b.WriteByte('|')
 	b.WriteString(apiBase)
 	b.WriteByte('|')
-	b.WriteString(authMethod)
-	b.WriteByte('|')
-	b.WriteString(connectMode)
-	b.WriteByte('|')
 	b.WriteString(apiKeyFingerprint)
 
 	return b.String()
diff --git a/web/backend/api/model_status_test.go b/web/backend/api/model_status_test.go
index 848c59aeb..d5463a856 100644
--- a/web/backend/api/model_status_test.go
+++ b/web/backend/api/model_status_test.go
@@ -129,6 +129,29 @@ func TestModelProbeCacheKey_NormalizesTrailingSlashInAPIBase(t *testing.T) {
 	}
 }
 
+func TestModelProbeCacheKey_IgnoresDisplayAndConnectionFields(t *testing.T) {
+	base := &config.ModelConfig{
+		ModelName:   "vllm-one",
+		Model:       "vllm/custom-model",
+		APIBase:     "http://127.0.0.1:8000/v1",
+		AuthMethod:  "none",
+		ConnectMode: "http",
+	}
+	changed := &config.ModelConfig{
+		ModelName:   "vllm-two",
+		Model:       "vllm/custom-model",
+		APIBase:     "http://127.0.0.1:8000/v1",
+		AuthMethod:  "token",
+		ConnectMode: "ws",
+	}
+
+	k1 := modelProbeCacheKey(base)
+	k2 := modelProbeCacheKey(changed)
+	if k1 != k2 {
+		t.Fatalf("modelProbeCacheKey() should ignore non-probe fields, got %q vs %q", k1, k2)
+	}
+}
+
 func TestProbeLocalModelAvailability_SuccessBackoff(t *testing.T) {
 	resetModelProbeHooks(t)