diff --git a/src/components/playground/ConfigSidebar.tsx b/src/components/playground/ConfigSidebar.tsx
index f09d77f0..28eddbae 100644
--- a/src/components/playground/ConfigSidebar.tsx
+++ b/src/components/playground/ConfigSidebar.tsx
@@ -43,12 +43,16 @@ export default function ConfigSidebar({}: Props) {
       />
       <Slider
         label="maximum length"
-        range={[0, OpenAIChatModels[config.model].maxLimit || 8192]}
+        range={[-1, OpenAIChatModels[config.model].maxLimit || 8192]}
         step={1}
         value={config.max_tokens as number}
-        onChange={(value: OpenAIConfig["max_tokens"]) =>
-          handleUpdateConfig("max_tokens", value)
-        }
+        onChange={(value: OpenAIConfig["max_tokens"]) => {
+          if (value === -1) {
+            handleUpdateConfig("max_tokens", undefined)
+          } else {
+            handleUpdateConfig("max_tokens", value)
+          }
+        }}
       />
       <Slider
         label="top p"