Generate content using Vertex AI Express Mode

This sample utilizes Vertex AI Express Mode to generate text content.

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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" 
  
 "google.golang.org/genai" 
 ) 
 var 
  
 newClient 
  
 = 
  
 genai 
 . 
 NewClient 
 // generateContent shows how to use Vertex AI Express mode with an API key. 
 func 
  
 generateContentWithApiKey 
 ( 
 w 
  
 io 
 . 
 Writer 
 ) 
  
 error 
  
 { 
  
 ctx 
  
 := 
  
 context 
 . 
 Background 
 () 
  
 // TODO(developer): Replace with your actual API key 
  
 apiKey 
  
 := 
  
 "YOUR_API_KEY" 
  
 client 
 , 
  
 err 
  
 := 
  
 newClient 
 ( 
 ctx 
 , 
  
& genai 
 . 
 ClientConfig 
 { 
  
 APIKey 
 : 
  
 apiKey 
 , 
  
 HTTPOptions 
 : 
  
 genai 
 . 
 HTTPOptions 
 { 
 APIVersion 
 : 
  
 "v1" 
 }, 
  
 }) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "failed to create genai client: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 modelName 
  
 := 
  
 "gemini-2.5-flash" 
  
 resp 
 , 
  
 err 
  
 := 
  
 client 
 . 
 Models 
 . 
 GenerateContent 
 ( 
 ctx 
 , 
  
 modelName 
 , 
  
 [] 
 * 
 genai 
 . 
 Content 
 { 
  
 { 
 Parts 
 : 
  
 [] 
 * 
 genai 
 . 
 Part 
 { 
  
 { 
 Text 
 : 
  
 "Explain bubble sort to me." 
 }, 
  
 }, 
  
 Role 
 : 
  
 "user" 
 }, 
  
 }, 
  
 nil 
 , 
  
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "failed to generate content: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 fmt 
 . 
 Fprintln 
 ( 
 w 
 , 
  
 resp 
 . 
 Text 
 ()) 
  
 // Example response: 
  
 // Bubble Sort is a simple sorting algorithm that repeatedly steps through the list 
  
 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 
 # TODO(developer): Update below line 
 API_KEY 
 = 
 "YOUR_API_KEY" 
 client 
 = 
 genai 
 . 
 Client 
 ( 
 vertexai 
 = 
 True 
 , 
 api_key 
 = 
 API_KEY 
 ) 
 response 
 = 
 client 
 . 
 models 
 . 
 generate_content 
 ( 
 model 
 = 
 "gemini-2.5-flash" 
 , 
 contents 
 = 
 "Explain bubble sort to me." 
 , 
 ) 
 print 
 ( 
 response 
 . 
 text 
 ) 
 # Example response: 
 # Bubble Sort is a simple sorting algorithm that repeatedly steps through the list

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Code sample

Go

Python

What's next

Generate content using Vertex AI Express Mode