diff --git a/video-gen-api/app/config.py b/video-gen-api/app/config.py
index 7b7600e2..eb2eb956 100644
--- a/video-gen-api/app/config.py
+++ b/video-gen-api/app/config.py
@@ -170,7 +170,7 @@ class Settings(BaseSettings):
     CELERY_RUNTIME_GC_INTERVAL_SECONDS: int = 600
     CELERY_RUNTIME_GC_BATCH_SIZE: int = 500
 
-    CHATAPI_REQUEST_TIMEOUT_SECONDS: int = 180
+    CHATAPI_REQUEST_TIMEOUT_SECONDS: int = 600
     CHATAPI_VIDEO_FPS: float = 0.5
     CHATAPI_ASYNC_MAX_RETRIES: int = 3
     CHATAPI_ASYNC_RETRY_BACKOFF_SECONDS: int = 30
diff --git a/video-gen-api/app/services/hot_opening_replicate_service.py b/video-gen-api/app/services/hot_opening_replicate_service.py
index b8476710..c4b6096a 100644
--- a/video-gen-api/app/services/hot_opening_replicate_service.py
+++ b/video-gen-api/app/services/hot_opening_replicate_service.py
@@ -1152,10 +1152,10 @@ async def run_image_prompt_optimize(
             await db.commit()
             return None
         step.status = ModuleStepStatusEnum.FAILED.value
-        step.error_message = str(exc)
+        step.error_message = str(exc) if str(exc) else type(exc).__name__
         step.completed_at = _now()
         project.status = ModuleProjectStatusEnum.FAILED.value
-        project.error_message = f"图片 AI 提词生成失败: {exc}"
+        project.error_message = f"图片 AI 提词生成失败: {str(exc) if str(exc) else type(exc).__name__}"
         log_module_prompt_event(
             event_type="module_prompt_error",
             project_id=project.id,
@@ -1623,10 +1623,10 @@ async def run_video_prompt_optimize(
             await db.commit()
             return None
         step.status = ModuleStepStatusEnum.FAILED.value
-        step.error_message = str(exc)
+        step.error_message = str(exc) if str(exc) else type(exc).__name__
         step.completed_at = _now()
         project.status = ModuleProjectStatusEnum.FAILED.value
-        project.error_message = f"视频 AI 提词生成失败: {exc}"
+        project.error_message = f"视频 AI 提词生成失败: {str(exc) if str(exc) else type(exc).__name__}"
         log_module_prompt_event(
             event_type="module_prompt_error",
             project_id=project.id,
diff --git a/video-gen-api/app/services/module_generation_v2/flow_service.py b/video-gen-api/app/services/module_generation_v2/flow_service.py
index ed5d7d86..0be13454 100644
--- a/video-gen-api/app/services/module_generation_v2/flow_service.py
+++ b/video-gen-api/app/services/module_generation_v2/flow_service.py
@@ -1066,10 +1066,10 @@ async def run_video_prompt_optimize_v2(
                 project, step = row
                 if step.status == ModuleStepStatusEnum.PROCESSING.value:
                     step.status = ModuleStepStatusEnum.FAILED.value
-                    step.error_message = str(exc)
+                    step.error_message = str(exc) if str(exc) else type(exc).__name__
                     step.completed_at = utc_now()
                     project.status = ModuleProjectStatusEnum.FAILED.value
-                    project.error_message = str(exc)
+                    project.error_message = str(exc) if str(exc) else type(exc).__name__
             # provider 已成功时 settle_success 已在当前事务写入 RELEASE/CHARGE；
             # 即使业务步骤已不存在或已不是 processing，也必须提交账务结算。
             await db.commit()
diff --git a/video-gen-api/app/services/shot_replicate_flow_service.py b/video-gen-api/app/services/shot_replicate_flow_service.py
index 8ac13c50..6e750e68 100644
--- a/video-gen-api/app/services/shot_replicate_flow_service.py
+++ b/video-gen-api/app/services/shot_replicate_flow_service.py
@@ -1100,10 +1100,10 @@ async def run_image_prompt_optimize(
             await db.commit()
             return None
         step.status = ModuleStepStatusEnum.FAILED.value
-        step.error_message = str(exc)
+        step.error_message = str(exc) if str(exc) else type(exc).__name__
         step.completed_at = _now()
         project.status = ModuleProjectStatusEnum.FAILED.value
-        project.error_message = f"图片 AI 提词生成失败: {exc}"
+        project.error_message = f"图片 AI 提词生成失败: {str(exc) if str(exc) else type(exc).__name__}"
         log_module_prompt_event(
             event_type="module_prompt_error",
             project_id=project.id,
@@ -1581,10 +1581,10 @@ async def run_video_prompt_optimize(
             await db.commit()
             return None
         step.status = ModuleStepStatusEnum.FAILED.value
-        step.error_message = str(exc)
+        step.error_message = str(exc) if str(exc) else type(exc).__name__
         step.completed_at = _now()
         project.status = ModuleProjectStatusEnum.FAILED.value
-        project.error_message = f"视频 AI 提词生成失败: {exc}"
+        project.error_message = f"视频 AI 提词生成失败: {str(exc) if str(exc) else type(exc).__name__}"
         log_module_prompt_event(
             event_type="module_prompt_error",
             project_id=project.id,