diff --git a/python/valuecell/core/plan/planner.py b/python/valuecell/core/plan/planner.py
index 426907f6e..64d65e00d 100644
--- a/python/valuecell/core/plan/planner.py
+++ b/python/valuecell/core/plan/planner.py
@@ -99,7 +99,6 @@ def __init__(
             instructions=[PLANNER_INSTRUCTION],
             # output format
             markdown=False,
-            use_json_mode=True,
             output_schema=PlannerResponse,
             expected_output=PLANNER_EXPECTED_OUTPUT,
             # context
diff --git a/python/valuecell/core/super_agent/core.py b/python/valuecell/core/super_agent/core.py
index 099f7a235..dd5163024 100644
--- a/python/valuecell/core/super_agent/core.py
+++ b/python/valuecell/core/super_agent/core.py
@@ -52,7 +52,6 @@ def __init__(self) -> None:
             instructions=[SUPER_AGENT_INSTRUCTION],
             # output format
             expected_output=SUPER_AGENT_EXPECTED_OUTPUT,
-            use_json_mode=True,
             output_schema=SuperAgentOutcome,
             # context
             db=InMemoryDb(),