diff --git a/backend/internal/service/openai_account_scheduler.go b/backend/internal/service/openai_account_scheduler.go
index cf4bc26eb0..9e2b81035a 100644
--- a/backend/internal/service/openai_account_scheduler.go
+++ b/backend/internal/service/openai_account_scheduler.go
@@ -323,7 +323,7 @@ func (s *defaultOpenAIAccountScheduler) selectBySessionHash(
 		_ = s.service.deleteStickySessionAccountID(ctx, req.GroupID, sessionHash)
 		return nil, nil
 	}
-	if req.RequestedModel != "" && !account.IsModelSupported(req.RequestedModel) {
+	if req.RequestedModel != "" && !account.IsOpenAIPassthroughEnabled() && !account.IsModelSupported(req.RequestedModel) {
 		return nil, nil
 	}
 	if !s.isAccountTransportCompatible(account, req.RequiredTransport) {
@@ -582,7 +582,7 @@ func (s *defaultOpenAIAccountScheduler) selectByLoadBalance(
 		if !account.IsSchedulable() || !account.IsOpenAI() {
 			continue
 		}
-		if req.RequestedModel != "" && !account.IsModelSupported(req.RequestedModel) {
+		if req.RequestedModel != "" && !account.IsOpenAIPassthroughEnabled() && !account.IsModelSupported(req.RequestedModel) {
 			continue
 		}
 		if !s.isAccountTransportCompatible(account, req.RequiredTransport) {