diff --git a/.changeset/clear-cups-carry.md b/.changeset/clear-cups-carry.md
new file mode 100644
index 0000000000..17254f2bce
--- /dev/null
+++ b/.changeset/clear-cups-carry.md
@@ -0,0 +1,5 @@
+---
+'@posthog/ai': patch
+---
+
+chore: make `MonitoringGeminiConfig` extend `GoogleGenAIOptions` to expose additional configuration options like `googleAuthOptions` for proper `GoogleGenAI` initialization
diff --git a/packages/ai/src/gemini/index.ts b/packages/ai/src/gemini/index.ts
index b35fb3cbaa..16bf12bea0 100644
--- a/packages/ai/src/gemini/index.ts
+++ b/packages/ai/src/gemini/index.ts
@@ -4,6 +4,7 @@ import {
   GenerateContentParameters,
   Part,
   GenerateContentResponseUsageMetadata,
+  GoogleGenAIOptions,
 } from '@google/genai'
 import { PostHog } from 'posthog-node'
 import {
@@ -17,12 +18,7 @@ import { sanitizeGemini } from '../sanitization'
 import type { TokenUsage, FormattedContent, FormattedContentItem, FormattedMessage } from '../types'
 import { isString } from '../typeGuards'
 
-interface MonitoringGeminiConfig {
-  apiKey?: string
-  vertexai?: boolean
-  project?: string
-  location?: string
-  apiVersion?: string
+interface MonitoringGeminiConfig extends GoogleGenAIOptions {
   posthog: PostHog
 }