diff --git a/backend/app/llm/catalog.py b/backend/app/llm/catalog.py
index 0d77893..a0cab1c 100644
--- a/backend/app/llm/catalog.py
+++ b/backend/app/llm/catalog.py
@@ -14,8 +14,9 @@ class ProviderCatalogEntry:
 PROVIDER_CATALOG: dict[str, ProviderCatalogEntry] = {
     "gemini": ProviderCatalogEntry(
         provider_id="gemini",
-        default_model="gemini-2.5-pro",
+        default_model="gemini-3.7-flash",
         model_options=(
+            "gemini-3.7-flash",
             "gemini-2.5-pro",
             "gemini-2.5-flash",
             "gemini-2.5-flash-lite",
diff --git a/docs/PROVIDER_GUIDE.md b/docs/PROVIDER_GUIDE.md
index e5241f6..13743ca 100644
--- a/docs/PROVIDER_GUIDE.md
+++ b/docs/PROVIDER_GUIDE.md
@@ -20,6 +20,7 @@ KG_GEMINI_API_KEY=...
 
 Current model options:
 
+- `gemini-3.7-flash`
 - `gemini-2.5-pro`
 - `gemini-2.5-flash`
 - `gemini-2.5-flash-lite`
diff --git a/frontend/src/components/SettingsModal.tsx b/frontend/src/components/SettingsModal.tsx
index ad3c17a..32f3276 100644
--- a/frontend/src/components/SettingsModal.tsx
+++ b/frontend/src/components/SettingsModal.tsx
@@ -10,7 +10,7 @@ type SupportedProvider = "gemini" | "openai";
 
 const DEFAULT_PROVIDER_MODELS: Record<SupportedProvider, string[]> = {
   openai: ["gpt-5.4", "gpt-5.4-mini", "gpt-5.4-nano", "gpt-5.1", "gpt-4.1", "gpt-4.1-mini"],
-  gemini: ["gemini-2.5-pro", "gemini-2.5-flash", "gemini-2.5-flash-lite", "gemini-3-pro-preview", "gemini-3-flash-preview"],
+  gemini: ["gemini-3.7-flash", "gemini-2.5-pro", "gemini-2.5-flash", "gemini-2.5-flash-lite", "gemini-3-pro-preview", "gemini-3-flash-preview"],
 };
 
 type ModeOption<T extends string> = {
diff --git a/frontend/src/hooks/useWorkspaceSettings.ts b/frontend/src/hooks/useWorkspaceSettings.ts
index 6578b5c..9530908 100644
--- a/frontend/src/hooks/useWorkspaceSettings.ts
+++ b/frontend/src/hooks/useWorkspaceSettings.ts
@@ -48,8 +48,8 @@ export function useWorkspaceSettings({
 }: UseWorkspaceSettingsArgs): UseWorkspaceSettingsResult {
   const [drafts, setDraftsState] = useState<SettingsDrafts>({
     provider: "gemini",
-    model: "gemini-2.5-pro",
-    modelPreset: "gemini-2.5-pro",
+    model: "gemini-3.7-flash",
+    modelPreset: "gemini-3.7-flash",
     geminiApiKey: "",
     openaiApiKey: "",
     openaiBaseUrl: "https://api.openai.com/v1",