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Tune Gemini models by using supervised fine-tuning | Generative AI on Vertex AI

Skip to main content Tune Gemini models by using supervised fine-tuning

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This guide shows you how to tune a Gemini model by using supervised fine-tuning.

This page covers the following topics:

Prepare your dataset: Learn about the dataset requirements for different tuning use cases.
Create a tuning job: Start a supervised fine-tuning job using the Google Cloud console, SDKs, or API.
View and manage tuning jobs: Learn how to list, get details of, and cancel your tuning jobs.
Evaluate the tuned model: Test your newly tuned model with prompts to assess its performance.
Review tuning and validation metrics: Visualize metrics in Vertex AI Studio to understand model performance during and after tuning.
Delete a tuned model: Remove a tuned model and its associated endpoint.

The following diagram summarizes the overall workflow:

Before you begin

Before you can tune a model, you must prepare a supervised fine-tuning dataset. For instructions, see the documentation for your data modality:

Supported models

The following Gemini models support supervised tuning:

Create a tuning job

You can create a supervised fine-tuning job by using the Google Cloud console, the Google Gen AI SDK, the Vertex AI SDK for Python, the REST API, or Colab Enterprise. The following table helps you decide which option is best for your use case.

Method Description Use Case Google Cloud console A graphical user interface for creating and managing tuning jobs. Best for getting started, visual exploration, or one-off tuning tasks without writing code. Google Gen AI SDK A high-level Python SDK focused specifically on generative AI workflows. Ideal for Python developers who want a simplified, generative AI-centric interface. Vertex AI SDK for Python The comprehensive Python SDK for all Vertex AI services. Recommended for integrating model tuning into larger MLOps pipelines and automation scripts. REST API A language-agnostic interface for making direct HTTP requests to the Vertex AI API. Use for custom integrations, non-Python environments, or when you need fine-grained control over requests. Colab Enterprise An interactive notebook environment with a side panel that generates code snippets for tuning. Excellent for experimentation, iterative development, and documenting your tuning process in a notebook. Console

To tune a text model by using the Google Cloud console, do the following:

In the Vertex AI section of the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio
Click Create tuned model.
Under Model details, configure the following:
1. In the Tuned model name field, enter a name for your new tuned model, up to 128 characters.
2. In the Base model field, select gemini-2.5-flash.
3. In the Region drop-down list, Select the region where the pipeline tuning job runs and where the tuned model is deployed.
Under Tuning setting, configure the following:
1. In the Number of epochs field, enter the number of epochs for model tuning.
2. In the Adapter Size field, enter the adapter size to use for model tuning.
3. In the Learning rate multiplier field, enter the step size at each iteration. The default value is 1. .
Optional: To disable intermediate checkpoints and use only the latest checkpoint, select the Export last checkpoint only toggle.
Click Continue. The Tuning dataset page opens.
Select your tuning dataset:
- To upload a new dataset file from your computer, select Upload file to Cloud Storage.
- In the Select JSONL file field, click Browse and select your dataset file.
- In the Dataset location field, click Browse and select the Cloud Storage bucket where you want to store your dataset file.
- To use a dataset file that is already in a Cloud Storage bucket, select Existing file on Cloud Storage.
- In the Cloud Storage file path field, click Browse and select the Cloud Storage bucket where your dataset file is located.
Optional: To get validation metrics during training, select the Enable model validation toggle.
1. In the Validation dataset field, enter the Cloud Storage path of your validation dataset.
Click Start Tuning.

Your new model appears in the Gemini Pro tuned models section on the Tune and Distill page. When the tuning job is complete, the Status is Succeeded.

Google Gen AI SDK Vertex AI SDK for Python REST

To create a model tuning job, send a POST request by using the tuningJobs.create method. Some parameters are not supported by all models. Include only the applicable parameters for the model that you're tuning.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
TUNING_JOB_REGION: The region where the tuning job runs. This is also the default region for where the tuned model is uploaded.
BASE_MODEL: Name of the foundation model to tune.
TRAINING_DATASET_URI: Cloud Storage URI of your training dataset. The dataset must be formatted as a JSONL file. For best results, provide at least 100 to 500 examples. For more information, see About supervised tuning datasets .
VALIDATION_DATASET_URIOptional: The Cloud Storage URI of your validation dataset file.
EPOCH_COUNTOptional: The number of complete passes the model makes over the entire training dataset during training. Leave it unset to use the pre-populated recommended value.
ADAPTER_SIZEOptional: The Adapter size to use for the tuning job. The adapter size influences the number of trainable parameters for the tuning job. A larger adapter size implies that the model can learn more complex tasks, but it requires a larger training dataset and longer training times.
LEARNING_RATE_MULTIPLIER: Optional: A multiplier to apply to the recommended learning rate. Leave it unset to use the recommended value.
EXPORT_LAST_CHECKPOINT_ONLYOptional: Set to true to use only the latest checkpoint.
TUNED_MODEL_DISPLAYNAMEOptional: A display name for the tuned model. If not set, a random name is generated.
KMS_KEY_NAMEOptional: The Cloud KMS resource identifier of the customer-managed encryption key used to protect a resource. The key has the format: projects/my-project/locations/my-region/keyRings/my-kr/cryptoKeys/my-key. The key needs to be in the same region as where the compute resource is created. For more information, see Customer-managed encryption keys (CMEK).
SERVICE_ACCOUNTOptional: The service account that the tuningJob workload runs as. If not specified, the Vertex AI Secure Fine-Tuning Service Agent in the project is used. See Tuning Service Agent. If you plan to use a customer-managed Service Account, you must grant the roles/aiplatform.tuningServiceAgent role to the service account. Also grant the Tuning Service Agent roles/iam.serviceAccountTokenCreator role to the customer-managed Service Account.

HTTP method and URL:

POST https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs

Request JSON body:

{
  "baseModel": "BASE_MODEL",
  "supervisedTuningSpec" : {
      "trainingDatasetUri": "TRAINING_DATASET_URI",
      "validationDatasetUri": "VALIDATION_DATASET_URI",
      "hyperParameters": {
          "epochCount": "EPOCH_COUNT",
          "adapterSize": "ADAPTER_SIZE",
          "learningRateMultiplier": "LEARNING_RATE_MULTIPLIER"
      },
      "export_last_checkpoint_only": EXPORT_LAST_CHECKPOINT_ONLY,
  },
  "tunedModelDisplayName": "TUNED_MODEL_DISPLAYNAME",
  "encryptionSpec": {
    "kmsKeyName": "KMS_KEY_NAME"
  },
  "serviceAccount": "SERVICE_ACCOUNT"
}

To send your request, choose one of these options:

curl Note: The following command assumes that you have logged in to the gcloud CLI with your user account by running gcloud init or gcloud auth login , or by using Cloud Shell, which automatically logs you into the gcloud CLI . You can check the currently active account by running gcloud auth list.

Save the request body in a file named request.json, and execute the following command:

curl -X POST \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     -H "Content-Type: application/json; charset=utf-8" \
     -d @request.json \
     "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs"

PowerShell Note: The following command assumes that you have logged in to the gcloud CLI with your user account by running gcloud init or gcloud auth login . You can check the currently active account by running gcloud auth list.

Save the request body in a file named request.json, and execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

-Method POST `
-Headers $headers `
-ContentType: "application/json; charset=utf-8" `
-InFile request.json `
-Uri "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs" | Select-Object -Expand Content

You should receive a JSON response similar to the following.

Response

{
  "name": "projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID",
  "createTime": CREATE_TIME,
  "updateTime": UPDATE_TIME,
  "status": "STATUS",
  "supervisedTuningSpec": {
        "trainingDatasetUri": "TRAINING_DATASET_URI",
        "validationDatasetUri": "VALIDATION_DATASET_URI",
        "hyperParameters": {
            "epochCount": EPOCH_COUNT,
            "adapterSize": "ADAPTER_SIZE",
            "learningRateMultiplier": LEARNING_RATE_MULTIPLIER
        },
    },
  "tunedModelDisplayName": "TUNED_MODEL_DISPLAYNAME",
  "encryptionSpec": {
    "kmsKeyName": "KMS_KEY_NAME"
  },
  "serviceAccount": "SERVICE_ACCOUNT"
}

Example curl command

PROJECT_ID=myproject
LOCATION=global
curl \
-X POST \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Content-Type: application/json; charset=utf-8" \
"https://${LOCATION}-aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/${LOCATION}/tuningJobs" \
-d \
$'{
   "baseModel": "gemini-2.5-flash",
   "supervisedTuningSpec" : {
      "training_dataset_uri": "gs://cloud-samples-data/ai-platform/generative_ai/gemini/text/sft_train_data.jsonl",
      "validation_dataset_uri": "gs://cloud-samples-data/ai-platform/generative_ai/gemini/text/sft_validation_data.jsonl"
   },
   "tunedModelDisplayName": "tuned_gemini"
}'

Colab Enterprise

You can create a model tuning job in Vertex AI by using the side panel in Colab Enterprise. The side panel adds the relevant code snippets to your notebook. You can then modify the code snippets and run them to create your tuning job. To learn more about using the side panel with your Vertex AI tuning jobs, see Interact with Vertex AI to tune a model.

In the Google Cloud console, go to the Colab Enterprise My notebooks page.

Go to My notebooks
In the Region menu, select the region that contains your notebook.
Click the notebook that you want to open. If you haven't created a notebook yet, create a notebook.
To the right of your notebook, in the side panel, click the Tuning button.

The side panel expands the Tuning tab.
Click the Tune a Gemini model button.

Colab Enterprise adds code cells to your notebook for tuning a Gemini model.
In your notebook, find the code cell that stores parameter values. You'll use these parameters to interact with Vertex AI.
Update the values for the following parameters:
- PROJECT_ID: The ID of the project that your notebook is in.
- REGION: The region that your notebook is in.
- TUNED_MODEL_DISPLAY_NAME: The name of your tuned model.
In the next code cell, update the model tuning parameters:
- source_model: The Gemini model that you want to use, for example, gemini-2.0-flash-001.
- train_dataset: The URL of your training dataset.
- validation_dataset: The URL of your validation dataset.
- Adjust the remaining parameters as needed.
Run the code cells that the side panel added to your notebook.
After the last code cell runs, click the View tuning job button that appears.
The side panel shows information about your model tuning job.
- The Monitor tab shows tuning metrics when the metrics are ready.
- The Dataset tab shows a summary and metrics about your dataset after the dataset has been processed.
- The Details tab shows information about your tuning job, such as the tuning method and the base model (source model) that you used.
After the tuning job has completed, you can go directly from the Tuning details tab to a page where you can test your model. Click Test.

The Google Cloud console opens to the Vertex AI Text chat page, where you can test your model.

Tuning hyperparameters

For your first tuning job, use the default hyperparameters. They are set to recommended values based on benchmarking results.

Epochs: The number of times the model sees the entire training dataset. Vertex AI automatically adjusts the default value based on your training dataset size to optimize model quality.
Adapter size: Influences the number of trainable parameters. A larger adapter size lets the model learn more complex tasks but requires a larger dataset and longer training times.
Learning Rate Multiplier: A factor applied to the recommended learning rate. You can increase this value to converge faster or decrease it to help prevent overfitting.

For a discussion of best practices for supervised fine-tuning, see the blog post Supervised Fine Tuning for Gemini: A best practices guide.

View and manage tuning jobs

You can view a list of your tuning jobs, get the details of a specific job, or cancel a running job.

View a list of tuning jobs

To view a list of tuning jobs in your project, use the Google Cloud console, the Google Gen AI SDK, the Vertex AI SDK for Python, or send a GET request by using the tuningJobs method.

Console

To view your tuning jobs in the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio

Your Gemini tuning jobs are listed in the Gemini Pro tuned models table.

Google Gen AI SDK Vertex AI SDK for Python REST

To view a list of model tuning jobs, send a GET request by using the tuningJobs.list method.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
TUNING_JOB_REGION: The region where the tuning job runs. This is also the default region for where the tuned model is uploaded.

HTTP method and URL:

GET https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs

To send your request, choose one of these options:

Execute the following command:

curl -X GET \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs"

Execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

-Method GET `
-Headers $headers `
-Uri "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs" | Select-Object -Expand Content

You should receive a JSON response similar to the following.

Response

{
  "tuning_jobs": [
    TUNING_JOB_1, TUNING_JOB_2, ...
  ]
}

Get details of a tuning job

To get the details of a specific tuning job, use the Google Cloud console, the Google Gen AI SDK, the Vertex AI SDK for Python, or send a GET request by using the tuningJobs method.

Console

To view details of a tuned model in the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio
In the Gemini Pro tuned models table, find your model and click Details.

The model details page opens.

Google Gen AI SDK Vertex AI SDK for Python REST

To get the details of a model tuning job, send a GET request by using the tuningJobs.get method and specify the TuningJob_ID.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
TUNING_JOB_REGION: The region where the tuning job runs. This is also the default region for where the tuned model is uploaded.
TUNING_JOB_ID: The ID of the tuning job.

HTTP method and URL:

GET https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID

To send your request, choose one of these options:

Execute the following command:

curl -X GET \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID"

Execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

-Method GET `
-Headers $headers `
-Uri "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID" | Select-Object -Expand Content

You should receive a JSON response similar to the following.

Response

{
  "name": "projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID",
  "tunedModelDisplayName": "TUNED_MODEL_DISPLAYNAME",
  "createTime": CREATE_TIME,
  "endTime": END_TIME,
  "tunedModel": {
      "model": "projects/PROJECT_ID/locations/TUNING_JOB_REGION/models/MODEL_ID",
      "endpoint": "projects/PROJECT_ID/locations/TUNING_JOB_REGION/endpoints/ENDPOINT_ID"
  },
  "experiment": "projects/PROJECT_ID/locations/TUNING_JOB_REGION/metadataStores/default/contexts/EXPERIMENT_ID",
  "tuning_data_statistics": {
      "supervisedTuningDataStats": {
          "tuninDatasetExampleCount": "TUNING_DATASET_EXAMPLE_COUNT",
          "totalBillableTokenCount": "TOTAL_BILLABLE_TOKEN_COUNT",
          "tuningStepCount": "TUNING_STEP_COUNT"
      }
  },
  "status": "STATUS",
  "supervisedTuningSpec" : {
        "trainingDatasetUri": "TRAINING_DATASET_URI",
        "validationDataset_uri": "VALIDATION_DATASET_URI",
        "hyperParameters": {
            "epochCount": EPOCH_COUNT,
            "learningRateMultiplier": LEARNING_RATE_MULTIPLIER
        }
    }
}

Cancel a tuning job

To cancel a running tuning job, use the Google Cloud console, the Vertex AI SDK for Python, or send a POST request using the tuningJobs method.

Console

To cancel a tuning job in the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio
In the Gemini Pro tuned models table, click more_vert Manage run.
Click Cancel.

Vertex AI SDK for Python REST

To cancel a model tuning job, send a POST request by using the tuningJobs.cancel method and specify the TuningJob_ID.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
TUNING_JOB_REGION: The region where the tuning job runs. This is also the default region for where the tuned model is uploaded.
TUNING_JOB_ID: The ID of the tuning job.

HTTP method and URL:

POST https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID:cancel

To send your request, choose one of these options:

Execute the following command:

curl -X POST \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     -H "Content-Type: application/json; charset=utf-8" \
     -d "" \
     "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID:cancel"

Execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

-Method POST `
-Headers $headers `
-Uri "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/tuningJobs/TUNING_JOB_ID:cancel" | Select-Object -Expand Content

You should receive a JSON response similar to the following.

Response

{}

Evaluate the tuned model

After your model is tuned, you can interact with its endpoint in the same way as a base Gemini model. You can use the Vertex AI SDK for Python, the Google Gen AI SDK, or send a POST request by using the generateContent method.

For models that support reasoning, such as Gemini 2.5 Flash, set the thinking budget to 0 for tuned tasks to optimize performance and cost. During supervised fine-tuning, the model learns to mimic the ground truth in the tuning dataset and omits the thinking process. Therefore, the tuned model can handle the task effectively without a thinking budget.

The following examples show how to prompt a tuned model with the question "Why is the sky blue?".

Console

To test a tuned model in the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio
In the Gemini Pro tuned models table, find your model and click Test.

A new page opens where you can create a conversation with your tuned model.

Google Gen AI SDK Vertex AI SDK for Python

from vertexai.generative_models import GenerativeModel

sft_tuning_job = sft.SupervisedTuningJob("projects/<PROJECT_ID>/locations/<TUNING_JOB_REGION>/tuningJobs/<TUNING_JOB_ID>")
tuned_model = GenerativeModel(sft_tuning_job.tuned_model_endpoint_name)
print(tuned_model.generate_content(content))

REST

To test a tuned model with a prompt, send a POST request and specify the TUNED_ENDPOINT_ID.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
TUNING_JOB_REGION: The region where the tuning job runs. This is also the default region for where the tuned model is uploaded.
ENDPOINT_ID: The tuned model endpoint ID from the GET API.
TEMPERATURE: The temperature is used for sampling during response generation, which occurs when topP and topK are applied. Temperature controls the degree of randomness in token selection. Lower temperatures are good for prompts that require a less open-ended or creative response, while higher temperatures can lead to more diverse or creative results. A temperature of 0 means that the highest probability tokens are always selected. In this case, responses for a given prompt are mostly deterministic, but a small amount of variation is still possible.
If the model returns a response that's too generic, too short, or the model gives a fallback response, try increasing the temperature.
TOP_P: Top-P changes how the model selects tokens for output. Tokens are selected from the most probable to least probable until the sum of their probabilities equals the top-P value. For example, if tokens A, B, and C have a probability of 0.3, 0.2, and 0.1 and the top-P value is 0.5, then the model will select either A or B as the next token by using temperature and excludes C as a candidate.
Specify a lower value for less random responses and a higher value for more random responses.
TOP_K: Top-K changes how the model selects tokens for output. A top-K of 1 means the next selected token is the most probable among all tokens in the model's vocabulary (also called greedy decoding), while a top-K of 3 means that the next token is selected from among the three most probable tokens by using temperature.
For each token selection step, the top-K tokens with the highest probabilities are sampled. Then tokens are further filtered based on top-P with the final token selected using temperature sampling.

Specify a lower value for less random responses and a higher value for more random responses.
MAX_OUTPUT_TOKENS: Maximum number of tokens that can be generated in the response. A token is approximately four characters. 100 tokens correspond to roughly 60-80 words.
Specify a lower value for shorter responses and a higher value for potentially longer responses.

HTTP method and URL:

POST https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/endpoints/ENDPOINT_ID:generateContent

Request JSON body:

{
    "contents": [
        {
            "role": "USER",
            "parts": {
                "text" : "Why is sky blue?"
            }
        }
    ],
    "generation_config": {
        "temperature":TEMPERATURE,
        "topP": TOP_P,
        "topK": TOP_K,
        "maxOutputTokens": MAX_OUTPUT_TOKENS
    }
}

To send your request, choose one of these options:

Save the request body in a file named request.json, and execute the following command:

curl -X POST \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     -H "Content-Type: application/json; charset=utf-8" \
     -d @request.json \
     "https://TUNING_JOB_REGION-aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/TUNING_JOB_REGION/endpoints/ENDPOINT_ID:generateContent"

Save the request body in a file named request.json, and execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

You should receive a JSON response similar to the following.

Response

{
  "candidates": [
    {
      "content": {
        "role": "model",
        "parts": [Why is sky blue?
          {
            "text": "The sky appears blue due to a phenomenon called Rayleigh scattering, where shorter blue wavelengths of sunlight are scattered more strongly by the Earth's atmosphere than longer red wavelengths."
          }
        ]
      },
      "finishReason": "STOP",
      "safetyRatings": [
        {
          "category": "HARM_CATEGORY_HATE_SPEECH",
          "probability": "NEGLIGIBLE",
          "probabilityScore": 0.06325052,
          "severity": "HARM_SEVERITY_NEGLIGIBLE",
          "severityScore": 0.03179867
        },
        {
          "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
          "probability": "NEGLIGIBLE",
          "probabilityScore": 0.09334688,
          "severity": "HARM_SEVERITY_NEGLIGIBLE",
          "severityScore": 0.027742893
        },
        {
          "category": "HARM_CATEGORY_HARASSMENT",
          "probability": "NEGLIGIBLE",
          "probabilityScore": 0.17356819,
          "severity": "HARM_SEVERITY_NEGLIGIBLE",
          "severityScore": 0.025419652
        },
        {
          "category": "HARM_CATEGORY_SEXUALLY_EXPLICIT",
          "probability": "NEGLIGIBLE",
          "probabilityScore": 0.07864238,
          "severity": "HARM_SEVERITY_NEGLIGIBLE",
          "severityScore": 0.020332353
        }
      ]
    }
  ],
  "usageMetadata": {
    "promptTokenCount": 5,
    "candidatesTokenCount": 33,
    "totalTokenCount": 38
  }
}

Delete a tuned model

To delete a tuned model:

Vertex AI SDK for Python

from google.cloud import aiplatform

aiplatform.init(project=PROJECT_ID, location=LOCATION)

# To find out which models are available in Model Registry
models = aiplatform.Model.list()

model = aiplatform.Model(MODEL_ID)
model.delete()

REST

Call the models.delete method.

Before using any of the request data, make the following replacements:

PROJECT_ID: .
REGION: The region where the tuned model is located.
MODEL_ID: The model to delete.

HTTP method and URL:

DELETE https://REGION-aiplatform.googleapis.com/v1beta1/projects/PROJECT_ID/locations/REGION/models/MODEL_ID

To send your request, choose one of these options:

Execute the following command:

curl -X DELETE \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     "https://REGION-aiplatform.googleapis.com/v1beta1/projects/PROJECT_ID/locations/REGION/models/MODEL_ID"

Execute the following command:

$cred = gcloud auth print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `

-Method DELETE `
-Headers $headers `
-Uri "https://REGION-aiplatform.googleapis.com/v1beta1/projects/PROJECT_ID/locations/REGION/models/MODEL_ID" | Select-Object -Expand Content

You should receive a successful status code (2xx) and an empty response.

Tuning and validation metrics

You can configure a model tuning job to collect and report tuning and evaluation metrics, which can then be visualized in Vertex AI Studio.

To view the metrics for a tuned model:

In the Vertex AI section of the Google Cloud console, go to the Vertex AI Studio page.

Go to Vertex AI Studio
In the Tune and Distill table, click the name of the tuned model that you want to view.

The metrics appear on the Monitor tab. Visualizations are available after the tuning job starts and are updated in real time.

Model tuning metrics

The model tuning job automatically collects the following tuning metrics for Gemini 2.0 Flash:

/train_total_loss: Loss for the tuning dataset at a training step.
/train_fraction_of_correct_next_step_preds: The token accuracy at a training step. A single prediction consists of a sequence of tokens. This metric measures the accuracy of the predicted tokens when compared to the ground truth in the tuning dataset.
/train_num_predictions: Number of predicted tokens at a training step.

Model validation metrics

If you provide a validation dataset when you create the tuning job, the following validation metrics are collected for Gemini 2.0 Flash. If you don't specify a validation dataset, only the tuning metrics are available.

/eval_total_loss: Loss for the validation dataset at a validation step.
/eval_fraction_of_correct_next_step_preds: The token accuracy at a validation step. A single prediction consists of a sequence of tokens. This metric measures the accuracy of the predicted tokens when compared to the ground truth in the validation dataset.
/eval_num_predictions: Number of predicted tokens at a validation step.

What's next

Learn about deploying a tuned Gemini model.
To learn how supervised fine-tuning can be used in a solution that builds a generative AI knowledge base, see Jump Start Solution: Generative AI knowledge base.
Learn how to fine-tune Generative AI models with Vertex AI Supervised Fine-tuning

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Last updated 2025-08-18 UTC.

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