add more gemini models

Author: mcndt

.changeset/brown-dingos-teach.md

@@ -0,0 +1,5 @@
+---
+"@browserbasehq/stagehand": major
+---
+
+Add support for Gemini 2.5 Flash, 2.5 Flash Lite, 2.5 Pro, and corresponding preview models.

packages/core/lib/v3/llm/LLMProvider.ts

@@ -89,7 +89,12 @@ const modelToProviderMap: { [key in AvailableModel]: ModelProvider } = {
   "gemini-1.5-flash-8b": "google",
   "gemini-2.0-flash-lite": "google",
   "gemini-2.0-flash": "google",
+  "gemini-2.5-flash": "google",
   "gemini-2.5-flash-preview-04-17": "google",
+  "gemini-2.5-flash-preview-09-2025": "google",
+  "gemini-2.5-flash-lite": "google",
+  "gemini-2.5-flash-lite-preview-09-2025": "google",
+  "gemini-2.5-pro": "google",
   "gemini-2.5-pro-preview-03-25": "google",
 };
 

packages/core/lib/v3/types/public/model.ts

@@ -54,7 +54,12 @@ export type AvailableModel =
   | "gemini-1.5-flash-8b"
   | "gemini-2.0-flash-lite"
   | "gemini-2.0-flash"
+  | "gemini-2.5-flash"
   | "gemini-2.5-flash-preview-04-17"
+  | "gemini-2.5-flash-preview-09-2025"
+  | "gemini-2.5-flash-lite"
+  | "gemini-2.5-flash-lite-preview-09-2025"
+  | "gemini-2.5-pro"
   | "gemini-2.5-pro-preview-03-25"
   | string;