Configurations to generate content with Multimodal AI Model

This sample demonstrates how to provide user configurations to a Multimodal AI Model

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For detailed documentation that includes this code sample, see the following:

Code sample

Go

Before trying this sample, follow the Go setup instructions in the Vertex AI quickstart using client libraries. For more information, see the Vertex AI Go API reference documentation.

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

import (
	"context"
	"fmt"
	"io"

	genai "google.golang.org/genai"
)

// generateWithConfig shows how to generate text using a text prompt and custom configuration.
func generateWithConfig(w io.Writer) error {
	ctx := context.Background()

	client, err := genai.NewClient(ctx, &genai.ClientConfig{
		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
	})
	if err != nil {
		return fmt.Errorf("failed to create genai client: %w", err)
	}

	modelName := "gemini-2.0-flash-001"
	contents := genai.Text("Why is the sky blue?")
	// See the documentation: https://googleapis.github.io/python-genai/genai.html#genai.types.GenerateContentConfig
	config := &genai.GenerateContentConfig{
		Temperature:      genai.Ptr(0.0),
		CandidateCount:   genai.Ptr(int64(1)),
		ResponseMIMEType: "application/json",
	}

	resp, err := client.Models.GenerateContent(ctx, modelName, contents, config)
	if err != nil {
		return fmt.Errorf("failed to generate content: %w", err)
	}

	respText, err := resp.Text()
	if err != nil {
		return fmt.Errorf("failed to convert model response to text: %w", err)
	}
	fmt.Fprintln(w, respText)
	// Example response:
	// {
	//   "explanation": "The sky is blue due to a phenomenon called Rayleigh scattering ...
	// }

	return nil
}

Python

Before trying this sample, follow the Python setup instructions in the Vertex AI quickstart using client libraries. For more information, see the Vertex AI Python API reference documentation.

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

from google import genai
from google.genai.types import GenerateContentConfig, HttpOptions

client = genai.Client(http_options=HttpOptions(api_version="v1"))
response = client.models.generate_content(
    model="gemini-2.5-flash-preview-05-20",
    contents="Why is the sky blue?",
    # See the SDK documentation at
    # https://googleapis.github.io/python-genai/genai.html#genai.types.GenerateContentConfig
    config=GenerateContentConfig(
        temperature=0,
        candidate_count=1,
        response_mime_type="application/json",
        top_p=0.95,
        top_k=20,
        seed=5,
        max_output_tokens=100,
        stop_sequences=["STOP!"],
        presence_penalty=0.0,
        frequency_penalty=0.0,
    ),
)
print(response.text)
# Example response:
# {
#   "explanation": "The sky appears blue due to a phenomenon called Rayleigh scattering. When ...
# }

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