diff --git a/internal/api/handlers/management/auth_files.go b/internal/api/handlers/management/auth_files.go
index 285b3ae29..57aa89858 100644
--- a/internal/api/handlers/management/auth_files.go
+++ b/internal/api/handlers/management/auth_files.go
@@ -2052,7 +2052,7 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 				log.Warnf("antigravity: failed to fetch project ID: %v", errProject)
 			} else {
 				projectID = fetchedProjectID
-				log.Infof("antigravity: obtained project ID %s", projectID)
+				log.Infof("antigravity: obtained project ID %s", util.HideAPIKey(projectID))
 			}
 		}
 
@@ -2096,7 +2096,7 @@ func (h *Handler) RequestAntigravityToken(c *gin.Context) {
 		CompleteOAuthSessionsByProvider("antigravity")
 		fmt.Printf("Authentication successful! Token saved to %s\n", savedPath)
 		if projectID != "" {
-			fmt.Printf("Using GCP project: %s\n", projectID)
+			fmt.Printf("Using GCP project: %s\n", util.HideAPIKey(projectID))
 		}
 		fmt.Println("You can now use Antigravity services through this CLI")
 	}()
diff --git a/internal/auth/antigravity/auth.go b/internal/auth/antigravity/auth.go
index 665047f9f..46e62f367 100644
--- a/internal/auth/antigravity/auth.go
+++ b/internal/auth/antigravity/auth.go
@@ -351,7 +351,7 @@ func (o *AntigravityAuth) OnboardUser(ctx context.Context, accessToken, tierID s
 				}
 
 				if projectID != "" {
-					log.Infof("Successfully fetched project_id: %s", projectID)
+					log.Infof("Successfully fetched project_id: %s", util.HideAPIKey(projectID))
 					return projectID, nil
 				}
 
diff --git a/sdk/auth/antigravity.go b/sdk/auth/antigravity.go
index 8660f29d1..53a6f1430 100644
--- a/sdk/auth/antigravity.go
+++ b/sdk/auth/antigravity.go
@@ -180,7 +180,7 @@ waitForCallback:
 			return nil, fmt.Errorf("antigravity: failed to fetch project ID: %w", errProject)
 		} else {
 			projectID = fetchedProjectID
-			log.Infof("antigravity: obtained project ID %s", projectID)
+			log.Infof("antigravity: obtained project ID %s", util.HideAPIKey(projectID))
 		}
 	}
 	if strings.TrimSpace(projectID) == "" {
@@ -211,7 +211,7 @@ waitForCallback:
 
 	fmt.Println("Antigravity authentication successful")
 	if projectID != "" {
-		fmt.Printf("Using GCP project: %s\n", projectID)
+		fmt.Printf("Using GCP project: %s\n", util.HideAPIKey(projectID))
 	}
 	return &coreauth.Auth{
 		ID:       fileName,