Working with Cohere's API and SDK

The Cohere platform allows you to leverage the power of large language models (LLMs) with just a few lines of code and an API key.

Our Command, Embed, Rerank, and Aya models excel at a variety of applications, from the relatively simple (semantic search, and content generation) to the more advanced (retrieval augmented generation and agents). If you have a more specialized use case and custom data, you can also train a custom model to get better performance.

Check out our documentation if you’re ready to start building, and you might want to check out our API pricing.

SDKs

The Cohere SDK is the primary way of accessing Cohere’s models. We support SDKs in four different languages. To get started, please see the installation methods and code snippets below.

Python

https://github.com/cohere-ai/cohere-python

$ python -m pip install cohere --upgrade

1 import cohere
2 
3 co = cohere.ClientV2("<<apiKey>>")
4 response = co.chat(
5     model="command-a-03-2025", 
6     messages=[{"role": "user", "content": "hello world!"}]
7 )
8 
9 print(response)

Typescript

https://github.com/cohere-ai/cohere-typescript

$ npm i -s cohere-ai

1 const { CohereClientV2 } = require('cohere-ai');
2 
3 const cohere = new CohereClientV2({
4   token: '<<apiKey>>',
5 });
6 
7 (async () => {
8   const response = await cohere.chat({
9     model: 'command-a-03-2025',
10     messages: [
11       {
12         role: 'user',
13         content: 'hello world!',
14       },
15     ],
16   });
17 
18   console.log(response);
19 })();

Java

https://github.com/cohere-ai/cohere-java

1 implementation 'com.cohere:cohere-java:1.x.x'

1 package chatv2post;
2 
3 import com.cohere.api.Cohere;
4 import com.cohere.api.resources.v2.requests.V2ChatRequest;
5 import com.cohere.api.types.*;
6 import java.util.List;
7 
8 public class Default {
9     public static void main(String[] args) {
10         Cohere cohere = Cohere.builder().token("<<apiKey>>").clientName("snippet").build();
11 
12         ChatResponse response =
13                 cohere.v2()
14                         .chat(
15                                 V2ChatRequest.builder()
16                                     .model("command-a-03-2025")
17                                     .messages(
18                                         List.of(
19                                             ChatMessageV2.user(
20                                                 UserMessage.builder()
21                                                     .content(
22                                                         UserMessageContent
23                                                                 .of("Hello world!"))
24                                                     .build())))
25                                     .build());
26 
27         System.out.println(response);
28     }
29 }

Go

https://github.com/cohere-ai/cohere-go

$ go get github.com/cohere-ai/cohere-go/v2

1 package main
2 
3 import (
4 	"context"
5 	"log"
6 
7 	cohere "github.com/cohere-ai/cohere-go/v2"
8 	client "github.com/cohere-ai/cohere-go/v2/client"
9 )
10 
11 func main() {
12 	co := client.NewClient(client.WithToken("Your API key"))
13 
14 	resp, err := co.Chat(
15 		context.TODO(),
16 		&cohere.ChatRequest{
17 			Message: "Hello world!",
18 		},
19 	)
20 
21 	if err != nil {
22 		log.Fatal(err)
23 	}
24 
25 	log.Printf("%+v", resp)
26 }

Request Specification

To make a request to any model, you must pass in the Authorization Header and the request must be made through a POST request.

The content of Authorization should be in the shape of BEARER [API_KEY]. All request bodies are sent through JSON.

Model names are found within the dashboard, and details about endpoints are available within the documentation.