diff --git a/backend/internal/pkg/antigravity/client_test.go b/backend/internal/pkg/antigravity/client_test.go
index 7e8d3a2a..d3e2fd94 100644
--- a/backend/internal/pkg/antigravity/client_test.go
+++ b/backend/internal/pkg/antigravity/client_test.go
@@ -49,8 +49,8 @@ func TestNewAPIRequestWithURL_普通请求(t *testing.T) {
 	if auth := req.Header.Get("Authorization"); auth != "Bearer test-token" {
 		t.Errorf("Authorization 不匹配: got %s", auth)
 	}
-	if ua := req.Header.Get("User-Agent"); ua != UserAgent {
-		t.Errorf("User-Agent 不匹配: got %s, want %s", ua, UserAgent)
+	if ua := req.Header.Get("User-Agent"); ua != GetUserAgent() {
+		t.Errorf("User-Agent 不匹配: got %s, want %s", ua, GetUserAgent())
 	}
 }
 
@@ -1191,7 +1191,7 @@ func TestClient_LoadCodeAssist_Success_RealCall(t *testing.T) {
 		if ct := r.Header.Get("Content-Type"); ct != "application/json" {
 			t.Errorf("Content-Type 不匹配: got %s", ct)
 		}
-		if ua := r.Header.Get("User-Agent"); ua != UserAgent {
+		if ua := r.Header.Get("User-Agent"); ua != GetUserAgent() {
 			t.Errorf("User-Agent 不匹配: got %s", ua)
 		}
 
@@ -1380,7 +1380,7 @@ func TestClient_FetchAvailableModels_Success_RealCall(t *testing.T) {
 		if ct := r.Header.Get("Content-Type"); ct != "application/json" {
 			t.Errorf("Content-Type 不匹配: got %s", ct)
 		}
-		if ua := r.Header.Get("User-Agent"); ua != UserAgent {
+		if ua := r.Header.Get("User-Agent"); ua != GetUserAgent() {
 			t.Errorf("User-Agent 不匹配: got %s", ua)
 		}
 
diff --git a/backend/internal/pkg/antigravity/oauth.go b/backend/internal/pkg/antigravity/oauth.go
index cdda9be6..ba84a247 100644
--- a/backend/internal/pkg/antigravity/oauth.go
+++ b/backend/internal/pkg/antigravity/oauth.go
@@ -64,7 +64,8 @@ func init() {
 // GetUserAgent 返回当前配置的 User-Agent
 func GetUserAgent() string {
 	return fmt.Sprintf("antigravity/%s windows/amd64", defaultUserAgentVersion)
-  
+}
+
 func getClientSecret() (string, error) {
 	if v := strings.TrimSpace(ClientSecret); v != "" {
 		return v, nil
diff --git a/backend/internal/pkg/antigravity/oauth_test.go b/backend/internal/pkg/antigravity/oauth_test.go
index 67731c06..78184941 100644
--- a/backend/internal/pkg/antigravity/oauth_test.go
+++ b/backend/internal/pkg/antigravity/oauth_test.go
@@ -676,8 +676,8 @@ func TestConstants_值正确(t *testing.T) {
 	if RedirectURI != "http://localhost:8085/callback" {
 		t.Errorf("RedirectURI 不匹配: got %s", RedirectURI)
 	}
-	if UserAgent != "antigravity/1.15.8 windows/amd64" {
-		t.Errorf("UserAgent 不匹配: got %s", UserAgent)
+	if GetUserAgent() != "antigravity/1.84.2 windows/amd64" {
+		t.Errorf("UserAgent 不匹配: got %s", GetUserAgent())
 	}
 	if SessionTTL != 30*time.Minute {
 		t.Errorf("SessionTTL 不匹配: got %v", SessionTTL)
diff --git a/backend/internal/service/model_rate_limit_test.go b/backend/internal/service/model_rate_limit_test.go
index b79b9688..c8f78ce3 100644
--- a/backend/internal/service/model_rate_limit_test.go
+++ b/backend/internal/service/model_rate_limit_test.go
@@ -107,12 +107,12 @@ func TestIsModelRateLimited(t *testing.T) {
 			expected:       true,
 		},
 		{
-			name: "antigravity platform - gemini-3-pro-preview mapped to gemini-3-pro-high",
+			name: "antigravity platform - gemini-3-pro-preview mapped to gemini-3.1-pro-high",
 			account: &Account{
 				Platform: PlatformAntigravity,
 				Extra: map[string]any{
 					modelRateLimitsKey: map[string]any{
-						"gemini-3-pro-high": map[string]any{
+						"gemini-3.1-pro-high": map[string]any{
 							"rate_limit_reset_at": future,
 						},
 					},