diff --git a/crates/goose-cli/src/commands/configure.rs b/crates/goose-cli/src/commands/configure.rs
index 8b16cd46fa..122b143eb6 100644
--- a/crates/goose-cli/src/commands/configure.rs
+++ b/crates/goose-cli/src/commands/configure.rs
@@ -2015,6 +2015,17 @@ fn add_provider() -> anyhow::Result<()> {
         .initial_value(true)
         .interact()?;
 
+    let base_path_input: String = cliclack::input("API base path (optional, press Enter to skip):")
+        .placeholder("e.g., v1/chat/completions or project_id/v1")
+        .required(false)
+        .interact()?;
+
+    let base_path = if base_path_input.trim().is_empty() {
+        None
+    } else {
+        Some(base_path_input)
+    };
+
     let headers = collect_custom_headers()?;
 
     create_custom_provider(CreateCustomProviderParams {
@@ -2027,7 +2038,7 @@ fn add_provider() -> anyhow::Result<()> {
         headers,
         requires_auth,
         catalog_provider_id: None,
-        base_path: None,
+        base_path,
     })?;
 
     cliclack::outro(format!("Custom provider added: {}", display_name))?;
diff --git a/ui/desktop/src/components/settings/providers/ProviderGrid.tsx b/ui/desktop/src/components/settings/providers/ProviderGrid.tsx
index 834d0bfee1..ea4e5f4977 100644
--- a/ui/desktop/src/components/settings/providers/ProviderGrid.tsx
+++ b/ui/desktop/src/components/settings/providers/ProviderGrid.tsx
@@ -236,6 +236,7 @@ function ProviderCards({
     engine: editingProvider.config.engine,
     display_name: editingProvider.config.display_name,
     api_url: editingProvider.config.base_url,
+    base_path: editingProvider.config.base_path ?? undefined,
     api_key: '',
     models: editingProvider.config.models.map((m) => m.name),
     supports_streaming: editingProvider.config.supports_streaming ?? true,
diff --git a/ui/desktop/src/components/settings/providers/modal/subcomponents/forms/CustomProviderForm.tsx b/ui/desktop/src/components/settings/providers/modal/subcomponents/forms/CustomProviderForm.tsx
index 7a9337654a..eda04e16cd 100644
--- a/ui/desktop/src/components/settings/providers/modal/subcomponents/forms/CustomProviderForm.tsx
+++ b/ui/desktop/src/components/settings/providers/modal/subcomponents/forms/CustomProviderForm.tsx
@@ -30,6 +30,7 @@ export default function CustomProviderForm({
   const [engine, setEngine] = useState('openai_compatible');
   const [displayName, setDisplayName] = useState('');
   const [apiUrl, setApiUrl] = useState('');
+  const [basePath, setBasePath] = useState('');
   const [apiKey, setApiKey] = useState('');
   const [models, setModels] = useState('');
   const [requiresAuth, setRequiresAuth] = useState(false);
@@ -59,6 +60,7 @@ export default function CustomProviderForm({
       setEngine(engineMap[initialData.engine] || 'openai_compatible');
       setDisplayName(initialData.display_name);
       setApiUrl(initialData.api_url);
+      setBasePath(initialData.base_path ?? '');
       setModels(initialData.models.join(', '));
       setSupportsStreaming(initialData.supports_streaming ?? true);
       setRequiresAuth(initialData.requires_auth ?? true);
@@ -81,6 +83,7 @@ export default function CustomProviderForm({
     // Prefill fields from template
     setDisplayName(template.name);
     setApiUrl(template.api_url);
+    setBasePath('');
     setSupportsStreaming(template.supports_streaming);
     setRequiresAuth(true);
 
@@ -101,6 +104,7 @@ export default function CustomProviderForm({
     setSelectedTemplate(null);
     setDisplayName('');
     setApiUrl('');
+    setBasePath('');
     setModels('');
     setEngine('openai_compatible');
     setSupportsStreaming(true);
@@ -233,6 +237,7 @@ export default function CustomProviderForm({
       requires_auth: requiresAuth,
       headers: headersObject,
       catalog_provider_id: selectedTemplate?.id ?? initialData?.catalog_provider_id ?? undefined,
+      base_path: basePath || undefined,
     });
   };
 
@@ -438,7 +443,7 @@ export default function CustomProviderForm({
             id="api-url"
             value={apiUrl}
             onChange={(e) => setApiUrl(e.target.value)}
-            placeholder="https://api.example.com/v1"
+            placeholder="https://api.example.com"
             aria-invalid={!!validationErrors.apiUrl}
             aria-describedby={validationErrors.apiUrl ? 'api-url-error' : undefined}
             className={validationErrors.apiUrl ? 'border-red-500' : ''}
@@ -451,6 +456,27 @@ export default function CustomProviderForm({
         </div>
       )}
 
+      {/* Base Path */}
+      {isEditable && (
+        <div>
+          <label
+            htmlFor="base-path"
+            className="flex items-center text-sm font-medium text-text-primary mb-2"
+          >
+            API Base Path (optional)
+          </label>
+          <Input
+            id="base-path"
+            value={basePath}
+            onChange={(e) => setBasePath(e.target.value)}
+            placeholder="e.g., v1/chat/completions or project_id/v1"
+          />
+          <p className="text-xs text-textSubtle mt-1">
+            Override the default API path. Leave blank to use the provider's default path.
+          </p>
+        </div>
+      )}
+
       {/* Authentication */}
       <div>
         <label className="block text-sm font-medium text-text-primary mb-2">Authentication</label>