diff --git a/controller/model.go b/controller/model.go
index 89a161f..6a0c274 100644
--- a/controller/model.go
+++ b/controller/model.go
@@ -684,14 +684,15 @@ func SyncZenmuxRatios(c *gin.Context) {
 		completionRatioMap = make(map[string]float64)
 	}
 
-	updated, skipped := 0, 0
+	updated := 0
 	for _, item := range catalog {
-		if item.InputPrice <= 0 {
-			skipped++
-			continue
+		// Only overwrite existing non-zero ratio if new price is also non-zero.
+		// This preserves manually configured ratios for models where Zenmux reports price=0
+		// (e.g. per-image billing models whose token price is not tracked here).
+		if item.InputPrice > 0 || modelRatioMap[item.Id] == 0 {
+			modelRatioMap[item.Id] = item.InputPrice
 		}
-		modelRatioMap[item.Id] = item.InputPrice
-		if item.OutputPrice > 0 {
+		if item.InputPrice > 0 && item.OutputPrice > 0 {
 			completionRatioMap[item.Id] = item.OutputPrice / item.InputPrice
 		}
 		updated++
@@ -727,7 +728,7 @@ func SyncZenmuxRatios(c *gin.Context) {
 
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,
-		"message": fmt.Sprintf("synced ratios for %d models (%d skipped — no pricing)", updated, skipped),
+		"message": fmt.Sprintf("synced ratios for %d models", updated),
 	})
 }