diff --git a/api/db/joint_services/tenant_model_service.py b/api/db/joint_services/tenant_model_service.py
index f53f83ab95..8e745d8e08 100644
--- a/api/db/joint_services/tenant_model_service.py
+++ b/api/db/joint_services/tenant_model_service.py
@@ -57,6 +57,14 @@ def get_model_config_by_type_and_name(tenant_id: str, model_type: str, model_nam
                 "api_base": embedding_cfg["base_url"],
                 "model_type": LLMType.EMBEDDING.value,
             }
+        elif model_type_val == LLMType.CHAT.value:
+            # Retry as CHAT with pure_model_name first; then fall back to a multimodal model registered under IMAGE2TEXT.
+            model_config = TenantLLMService.get_api_key(tenant_id, pure_model_name, LLMType.CHAT.value)
+            if not model_config:
+                model_config = TenantLLMService.get_api_key(tenant_id, pure_model_name, LLMType.IMAGE2TEXT.value)
+            if not model_config:
+                raise LookupError(f"Tenant Model with name {model_name} and type {model_type_val} not found")
+            config_dict = model_config.to_dict()
         else:
             model_config = TenantLLMService.get_api_key(tenant_id, pure_model_name, model_type_val)
             if not model_config:
@@ -67,7 +75,10 @@ def get_model_config_by_type_and_name(tenant_id: str, model_type: str, model_nam
         config_dict = model_config.to_dict()
     config_model_type = config_dict.get("model_type")
     config_model_type = config_model_type.value if hasattr(config_model_type, "value") else config_model_type
-    if config_model_type != model_type_val:
+    if config_model_type != model_type_val and not (
+            model_type_val == LLMType.CHAT.value
+            and config_model_type == LLMType.IMAGE2TEXT.value
+    ):
         raise LookupError(
             f"Tenant Model with name {model_name} has type {config_model_type}, expected {model_type_val}"
         )