Add model version to GenerateContent Output by VinayGuthal · Pull Request #8227 · firebase/firebase-android-sdk

VinayGuthal · 2026-05-28T18:30:00Z

This PR adds to the Firebase Android SDK's GenerateContentResponse object the output-only modelVersion string field, which enables developers to identify the exact version of the model that performed the inference.

gemini-code-assist · 2026-05-28T18:30:04Z

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	`/gemini review`	Performs a code review for the current pull request in its current state.
Pull Request Summary	`/gemini summary`	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	`/gemini help`	Displays a list of available commands.

Customization

To customize the Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counterproductive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.

github-actions · 2026-05-28T18:42:35Z

📝 PRs merging into main branch

Our main branch should always be in a releasable state. If you are working on a larger change, or if you don't want this change to see the light of the day just yet, consider using a feature branch first, and only merge into the main branch when the code complete and ready to be released.

rlazo · 2026-05-28T18:49:26Z

/gemini review

gemini-code-assist

Code Review

This pull request introduces the modelVersion property to GenerateContentResponse and its internal representation, updating serialization tests and API definitions accordingly. However, a critical compilation error was introduced in GenerateContentResponse.kt where the text property declaration was accidentally deleted, leaving an orphaned code block.

google-oss-bot · 2026-05-28T19:08:59Z

The public api surface has changed for the subproject ai-logic_firebase-ai:
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getFunctionCalls() [RemovedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getInlineDataParts() [RemovedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getParts() [AddedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getText() [RemovedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getThoughtSummary() [RemovedMethod]
error: Added class com.google.firebase.ai.type.GenerateContentResponseKt [AddedClass]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

thatfiredev · 2026-06-01T15:14:15Z

It would be nice if the developer could also get the model name before running generateContent - that way they could apply their own conditional logic depending on which model is available on the device.

Similar to how ML Kit exposes GenerativeModel#getBaseModelName().

rlazo · 2026-06-01T16:41:23Z

Could you update some of the tests entries in the https://github.com/FirebaseExtended/vertexai-sdk-test-data and check for it in the tests?

rlazo · 2026-06-01T16:56:56Z

It would be nice if the developer could also get the model name before running generateContent - that way they could apply their own conditional logic depending on which model is available on the device.

Similar to how ML Kit exposes GenerativeModel#getBaseModelName().

It would be nice, 100%. Sadly, there's no backend API for it

thatfiredev · 2026-06-01T17:15:53Z

It would be nice if the developer could also get the model name before running generateContent - that way they could apply their own conditional logic depending on which model is available on the device.
Similar to how ML Kit exposes GenerativeModel#getBaseModelName().

It would be nice, 100%. Sadly, there's no backend API for it

@rlazo I don't think we need to match the behavior for Cloud models, since those are specified by the user.
I'm thinking of something like:

val model = Firebase.ai(backend = GenerativeBackend.googleAI())
    .generativeModel(
        modelName = "gemini-3.1-flash-lite",
        onDeviceConfig = OnDeviceConfig(mode = InferenceMode.PREFER_ON_DEVICE)
    )

val onDeviceModelName = model.getOnDeviceModelName() // returns null if not available

Or more elegantly, we could put it somehwere in the "Available" status:

val statusText = when (FirebaseAIOnDevice.checkStatus()) {
  OnDeviceModelStatus.AVAILABLE -> { 
    "Model available: ${status.modelName}" // <-- getting the model name
  }
  OnDeviceModelStatus.DOWNLOADABLE -> "Model downloadable"
  OnDeviceModelStatus.DOWNLOADING -> "Model downloading..."
  OnDeviceModelStatus.UNAVAILABLE -> "On-device model unavailable"
  else -> "Unknown"
}

google-oss-bot · 2026-06-01T20:12:27Z

The public api surface has changed for the subproject ai-logic_firebase-ai:
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getFunctionCalls() [AddedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getInlineDataParts() [AddedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getParts() [RemovedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getText() [AddedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getThoughtSummary() [AddedMethod]
error: Removed class com.google.firebase.ai.type.GenerateContentResponseKt [RemovedClass]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

google-oss-bot · 2026-06-01T20:13:48Z

The public api surface has changed for the subproject ai-logic_firebase-ai:
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getFunctionCalls() [AddedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getInlineDataParts() [AddedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getParts() [RemovedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getText() [AddedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getThoughtSummary() [AddedMethod]
error: Removed class com.google.firebase.ai.type.GenerateContentResponseKt [RemovedClass]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

rlazo · 2026-06-01T21:20:10Z

@rlazo I don't think we need to match the behavior for Cloud models, since those are specified by the user. I'm thinking of something like:

val model = Firebase.ai(backend = GenerativeBackend.googleAI())
    .generativeModel(
        modelName = "gemini-3.1-flash-lite",
        onDeviceConfig = OnDeviceConfig(mode = InferenceMode.PREFER_ON_DEVICE)
    )

val onDeviceModelName = model.getOnDeviceModelName() // returns null if not available

My mistake! I though you were asking about this in the cloud model context, rather than on the on-device case. We have

firebase-android-sdk/ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/GenerativeModel.kt

Line 431 in 31ca8b7

public class OnDeviceExtension

OnDeviceExtension and we can add it there, absolutely.

Or more elegantly, we could put it somehwere in the "Available" status:

val statusText = when (FirebaseAIOnDevice.checkStatus()) {
  OnDeviceModelStatus.AVAILABLE -> { 
    "Model available: ${status.modelName}" // <-- getting the model name
  }
  OnDeviceModelStatus.DOWNLOADABLE -> "Model downloadable"
  OnDeviceModelStatus.DOWNLOADING -> "Model downloading..."
  OnDeviceModelStatus.UNAVAILABLE -> "On-device model unavailable"
  else -> "Unknown"
}

Since the introduction of STABLE & PREVIEW models, the API in FirebaseAIOnDevice has been marked as deprecated. You need to create a model instance first, by choosing one of the possible on-device variant, and then run checkStatus that means that by adding the getOnDeviceModelName there (or equivalent) devs would be able to do what you suggest here.

update

91c3bea

update

92d044d

VinayGuthal requested a review from rlazo May 28, 2026 18:43

gemini-code-assist Bot reviewed May 28, 2026

View reviewed changes

Comment thread ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/GenerateContentResponse.kt

rlazo reviewed Jun 1, 2026

View reviewed changes

Comment thread ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/GenerateContentResponse.kt Outdated

Comment thread ai-logic/firebase-ai/src/main/kotlin/com/google/firebase/ai/type/GenerateContentResponse.kt Outdated

VinayGuthal added 2 commits June 1, 2026 16:02

update

981669f

Merge branch 'main' into add_model_version_to_output

a8616bd

VinayGuthal force-pushed the add_model_version_to_output branch from 65810f2 to a8616bd Compare June 1, 2026 20:06

update

73a2329

Conversation

VinayGuthal commented May 28, 2026 • edited by rlazo Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

gemini-code-assist Bot commented May 28, 2026

Uh oh!

github-actions Bot commented May 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

📝 PRs merging into main branch

Uh oh!

rlazo commented May 28, 2026

Uh oh!

gemini-code-assist Bot left a comment

Choose a reason for hiding this comment

Code Review

Uh oh!

Uh oh!

google-oss-bot commented May 28, 2026

Uh oh!

thatfiredev commented Jun 1, 2026

Uh oh!

Uh oh!

Uh oh!

rlazo commented Jun 1, 2026

Uh oh!

rlazo commented Jun 1, 2026

Uh oh!

thatfiredev commented Jun 1, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

google-oss-bot commented Jun 1, 2026

Uh oh!

google-oss-bot commented Jun 1, 2026

Uh oh!

rlazo commented Jun 1, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

VinayGuthal commented May 28, 2026 •

edited by rlazo

Loading

github-actions Bot commented May 28, 2026 •

edited

Loading

thatfiredev commented Jun 1, 2026 •

edited

Loading