Mistral AI Embeddings

Spring AI supports the Mistral AI’s text embeddings models. Embeddings are vectorial representations of text that capture the semantic meaning of paragraphs through their position in a high dimensional vector space. Mistral AI Embeddings API offers cutting-edge, state-of-the-art embeddings for text, which can be used for many NLP tasks.

Prerequisites

You will need to create an API with MistralAI to access MistralAI embeddings models.

Create an account at MistralAI registration page and generate the token on the API Keys page. The Spring AI project defines a configuration property named spring.ai.mistralai.api-key that you should set to the value of the API Key obtained from console.mistral.ai. Exporting an environment variable is one way to set that configuration property:

export SPRING_AI_MISTRALAI_API_KEY=<INSERT KEY HERE>

Add Repositories and BOM

Spring AI artifacts are published in Spring Milestone and Snapshot repositories. Refer to the Repositories section to add these repositories to your build system.

To help with dependency management, Spring AI provides a BOM (bill of materials) to ensure that a consistent version of Spring AI is used throughout the entire project. Refer to the Dependency Management section to add the Spring AI BOM to your build system.

Auto-configuration

Spring AI provides Spring Boot auto-configuration for the MistralAI Embedding Client. To enable it add the following dependency to your project’s Maven pom.xml file:

<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-mistral-ai-spring-boot-starter</artifactId>
</dependency>

or to your Gradle build.gradle build file.

dependencies {
    implementation 'org.springframework.ai:spring-ai-mistral-ai-spring-boot-starter'
}
Refer to the Dependency Management section to add the Spring AI BOM to your build file.

Embedding Properties

Retry Properties

The prefix spring.ai.retry is used as the property prefix that lets you configure the retry mechanism for the Mistral AI Embedding client.

Property Description Default

spring.ai.retry.max-attempts

Maximum number of retry attempts.

10

spring.ai.retry.backoff.initial-interval

Initial sleep duration for the exponential backoff policy.

2 sec.

spring.ai.retry.backoff.multiplier

Backoff interval multiplier.

5

spring.ai.retry.backoff.max-interval

Maximum backoff duration.

3 min.

spring.ai.retry.on-client-errors

If false, throw a NonTransientAiException, and do not attempt retry for 4xx client error codes

false

spring.ai.retry.exclude-on-http-codes

List of HTTP status codes that should not trigger a retry (e.g. to throw NonTransientAiException).

empty

Connection Properties

The prefix spring.ai.mistralai is used as the property prefix that lets you connect to MistralAI.

Property Description Default

spring.ai.mistralai.base-url

The URL to connect to

api.mistral.ai

spring.ai.mistralai.api-key

The API Key

-

Configuration Properties

The prefix spring.ai.mistralai.embedding is property prefix that configures the EmbeddingClient implementation for MistralAI.

Property Description Default

spring.ai.mistralai.embedding.enabled

Enable OpenAI embedding client.

true

spring.ai.mistralai.embedding.base-url

Optional overrides the spring.ai.mistralai.base-url to provide embedding specific url

-

spring.ai.mistralai.embedding.api-key

Optional overrides the spring.ai.mistralai.api-key to provide embedding specific api-key

-

spring.ai.mistralai.embedding.metadata-mode

Document content extraction mode.

EMBED

spring.ai.mistralai.embedding.options.model

The model to use

mistral-embed

spring.ai.mistralai.embedding.options.encodingFormat

The format to return the embeddings in. Can be either float or base64.

-
You can override the common spring.ai.mistralai.base-url and spring.ai.mistralai.api-key for the ChatClient and EmbeddingClient implementations. The spring.ai.mistralai.embedding.base-url and spring.ai.mistralai.embedding.api-key properties if set take precedence over the common properties. Similarly, the spring.ai.mistralai.embedding.base-url and spring.ai.mistralai.embedding.api-key properties if set take precedence over the common properties. This is useful if you want to use different MistralAI accounts for different models and different model endpoints.
All properties prefixed with spring.ai.mistralai.embedding.options can be overridden at runtime by adding a request specific Embedding Options to the EmbeddingRequest call.

Embedding Options

The MistralAiEmbeddingOptions.java provides the MistralAI configurations, such as the model to use and etc.

The default options can be configured using the spring.ai.mistralai.embedding.options properties as well.

At start-time use the MistralAiEmbeddingClient constructor to set the default options used for all embedding requests. At run-time you can override the default options, using a MistralAiEmbeddingOptions instance as part of your EmbeddingRequest.

For example to override the default model name for a specific request:

EmbeddingResponse embeddingResponse = embeddingClient.call(
    new EmbeddingRequest(List.of("Hello World", "World is big and salvation is near"),
        MistralAiEmbeddingOptions.builder()
            .withModel("Different-Embedding-Model-Deployment-Name")
        .build()));

Sample Controller (Auto-configuration)

This will create a EmbeddingClient implementation that you can inject into your class. Here is an example of a simple @Controller class that uses the EmbeddingClient implementation.

spring.ai.mistralai.api-key=YOUR_API_KEY
spring.ai.mistralai.embedding.options.model=mistral-embed
@RestController
public class EmbeddingController {

    private final EmbeddingClient embeddingClient;

    @Autowired
    public EmbeddingController(EmbeddingClient embeddingClient) {
        this.embeddingClient = embeddingClient;
    }

    @GetMapping("/ai/embedding")
    public Map embed(@RequestParam(value = "message", defaultValue = "Tell me a joke") String message) {
        var embeddingResponse = this.embeddingClient.embedForResponse(List.of(message));
        return Map.of("embedding", embeddingResponse);
    }
}

Manual Configuration

If you are not using Spring Boot, you can manually configure the OpenAI Embedding Client. For this add the spring-ai-mistralai dependency to your project’s Maven pom.xml file:

<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-mistralai</artifactId>
</dependency>

or to your Gradle build.gradle build file.

dependencies {
    implementation 'org.springframework.ai:spring-ai-mistralai'
}
Refer to the Dependency Management section to add the Spring AI BOM to your build file.
The spring-ai-mistralai dependency provides access also to the MistralAiChatClient. For more information about the MistralAiChatClient refer to the MistralAI Chat Client section.

Next, create an MistralAiEmbeddingClient instance and use it to compute the similarity between two input texts:

var mistralAiApi = new MistralAiApi(System.getenv("MISTRAL_AI_API_KEY"));

var embeddingClient = new MistralAiEmbeddingClient(mistralAiApi,
        MistralAiEmbeddingOptions.builder()
                .withModel("mistral-embed")
                .withEncodingFormat("float")
                .build());

EmbeddingResponse embeddingResponse = embeddingClient
        .embedForResponse(List.of("Hello World", "World is big and salvation is near"));

The MistralAiEmbeddingOptions provides the configuration information for the embedding requests. The options class offers a builder() for easy options creation.