diff --git a/changelog.d/features/12638-gemini-3.8-flash.md b/changelog.d/features/12638-gemini-3.8-flash.md
new file mode 100644
index 0000000000..d386cdcf5e
--- /dev/null
+++ b/changelog.d/features/12638-gemini-3.8-flash.md
@@ -0,0 +1 @@
+- **feat(providers):** register `gemini-3.8-flash` ([#12638](https://github.com/diegosouzapw/OmniRoute/issues/12638)) — Gemini 3.8 Flash (DeepMind 2026-09-02) with tool calling and vision support
diff --git a/open-sse/config/providers/registry/gemini/index.ts b/open-sse/config/providers/registry/gemini/index.ts
index 468fcd8889..6225167c15 100644
--- a/open-sse/config/providers/registry/gemini/index.ts
+++ b/open-sse/config/providers/registry/gemini/index.ts
@@ -18,6 +18,12 @@ export const geminiProvider: RegistryEntry = {
     clientSecretDefault: resolvePublicCred("gemini_alt"),
   },
   models: [
+    {
+      id: "gemini-3.8-flash",
+      name: "Gemini 3.8 Flash",
+      toolCalling: true,
+      supportsVision: true,
+    },
     {
       id: "gemini-3.7-flash",
       name: "Gemini 3.7 Flash",