diff --git a/litellm/llms/ollama/chat/transformation.py b/litellm/llms/ollama/chat/transformation.py
index b740eb122f..9c8700daf8 100644
--- a/litellm/llms/ollama/chat/transformation.py
+++ b/litellm/llms/ollama/chat/transformation.py
@@ -188,7 +188,7 @@ class OllamaChatConfig(BaseConfig):
                 if model.startswith("gpt-oss"):
                     optional_params["think"] = value
                 else:
-                    optional_params["think"] = True
+                    optional_params["think"] = value in {"low", "medium", "high"}
             ### FUNCTION CALLING LOGIC ###
             if param == "tools":
                 ## CHECK IF MODEL SUPPORTS TOOL CALLING ##
diff --git a/litellm/llms/ollama/completion/transformation.py b/litellm/llms/ollama/completion/transformation.py
index b476e5c8a6..b02662233b 100644
--- a/litellm/llms/ollama/completion/transformation.py
+++ b/litellm/llms/ollama/completion/transformation.py
@@ -183,7 +183,7 @@ class OllamaConfig(BaseConfig):
                 if model.startswith("gpt-oss"):
                     optional_params["think"] = value
                 else:
-                    optional_params["think"] = True
+                    optional_params["think"] = value in {"low", "medium", "high"}
             elif param == "response_format" and isinstance(value, dict):
                 if value["type"] == "json_object":
                     optional_params["format"] = "json"