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I'm developing an Android app using Kotlin and Jetpack Compose. I'm trying to integrate Gemini AI to analyze images uploaded by the user using the Firebase Vertex AI SDK (com.google.firebase:firebase-vertexai-ktx).

Despite using the latest stable library versions managed by the Firebase BoM (32.7.4) and the corresponding Vertex AI library, I consistently get a 404 Not Found error when calling generateContent. The error message always indicates that the model (tried gemini-pro-vision, gemini-1.5-flash-latest, gemini-1.5-pro-latest) is not found for the v1beta API version.

Error Log: com.google.firebase.vertexai.type.ServerException: [404 Not Found] { "error": { "code": 404, "message": "models/[Google Gemini] is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.", "status": "NOT_FOUND" } }

What I've Tried:

  • Firebase BoM: Ensured firebase-vertexai-ktx version is managed by Firebase BoM (32.7.4).
  • Different Models: Tested with gemini-pro-vision, gemini-1.5-flash-latest, and gemini-1.5-pro-latest. The error persists.
  • API Key (Alternative Method): Also tried using the standalone Google AI Android SDK (com.google.ai.client.generativeai:generativeai:0.7.0) with a dedicated API key. Got the exact same 404 v1beta error.
  • API Key Verification: Verified the API key is correct for the project (smart-ai-outfit-app), has no restrictions, and the "Generative Language API" (generativelanguage.googleapis.com) is enabled.
  • New Project Test: Created a brand new Google Cloud Project, enabled the API, generated a new key, and tested with curl. Still received the 404 Not Found error for v1 and v1beta endpoints (generativelanguage.googleapis.com) for models like gemini-pro and gemini-1.0-pro.
  • gcloud Test: gcloud ai models list --region=us-central1 --project=[PROJECT_ID] returns "Listed 0 items" for both old and new projects, even after enabling the Vertex AI API (aiplatform.googleapis.com).
  • API Explorer Test: Calls via Google API Explorer (using the new project's API key) also result in the same 404 Not Found error.
  • Cache Clearing: Performed extensive cache clearing (Android Studio Invalidate/Restart, deleting .gradle/caches, deleting project .gradle and build folders, system restart).

Gradle Setup:

  • libs.versions.toml: 
    [versions]
# ... other versions ...
firebaseBom = "32.7.4"
kotlin = "2.0.21" # Or your Kotlin version
# ...

[libraries]
# ... other libraries ...
firebase-bom = { group = "com.google.firebase", name = "firebase-bom", version.ref = "firebaseBom" }
firebase-vertexai = { group = "com.google.firebase", name = "firebase-vertexai-ktx" } # Managed by BoM
# ...

[plugins]
# ... other plugins ...
  • app/build.gradle.kts: 
    dependencies {
    implementation(platform(libs.firebase.bom))
    implementation(libs.firebase.vertexai)
    // ... other Firebase and Android dependencies ...
}
  • settings.gradle.kts: Repositories google() and mavenCentral() are declared correctly.

Question:

Why does the SDK (both Firebase Vertex AI and Google AI) seem to be stuck using the v1beta endpoint, leading to a 404 Not Found error, even with the latest libraries and verified project/API setup? Is there any other configuration or potential account-level issue that could be causing this persistent error across different projects?

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2 Answers 2

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It's not the v1beta endpoint issue, you are using a retired Gemini model (see the retired models), retired on 9/24/2025, for both Gemini 1.5 (pro and flash). That's the reason of getting 404 NOT FOUND error (in either Vertex AI or AI Studio). You should migrate to Gemini 2.0/2.5 Flash and later instead following the latest Gemini migration guide.

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2 Comments

Thanks for the suggestion! I've updated my code to use a newer model available in the Firebase Vertex AI SDK, specifically gemini-2.5-flash-preview-09-2025. However, I'm still encountering a 404 Not Found error, often mentioning the v1beta endpoint even with the latest SDK (firebase-vertexai-ktx managed by BoM 32.7.4). Here's the initialization in my ViewModel: ```kotlin private val generativeModel = Firebase.vertexAI.generativeModel( modelName = "gemini-2.5-flash-preview-09-2025" )
can you try with gemini-flash-latest (which points to gemini-2.5-flash-preview-09-2025) or gemini-2.5-flash?
2

The firebase-vertexai-ktx library that you're trying to use was deprecated in favor of the new firebase-ai library (there's even a migration guide). You should use that library instead:

  1. Go to Firebase AI Logic in the Firebase console and click on "Get started".

  2. Update your code:

libs.versions.toml

[versions]
# ... other versions ...
firebaseBom = "34.4.0"  # <-- latest version of the Firebase BoM

# ...

[libraries]
# ... other libraries ...
firebase-bom = { group = "com.google.firebase", name = "firebase-bom", version.ref = "firebaseBom" }
firebase-ai = { group = "com.google.firebase", name = "firebase-ai" } # Managed by BoM
# ...

[plugins]
# ... other plugins ...

app/build.gradle.kts

dependencies {
    implementation(platform(libs.firebase.bom))
    implementation(libs.firebase.ai)
    // ... other Firebase and Android dependencies ...
}

In your Kotlin code:

val model = Firebase.ai(
  backend = GenerativeBackend.googleAI() // <- or GenerativeBackend.vertexAI()
).generativeModel(
  modelName = "gemini-2.5-flash" // Or whatever model fits your use case
)
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