MistralTextEmbedder

Embeds a query string using Mistral AI models and returns a vector for use in semantic search.

Embedding Models in Query Pipelines and Indexes

The embedding model you use to embed documents in your indexing pipeline must be the same as the embedding model you use to embed the query in your query pipeline.

This means the embedders for your indexing and query pipelines must match. For example, if you use CohereDocumentEmbedder to embed your documents, you should use CohereTextEmbedder with the same model to embed your queries.

Key Features

• Embeds query strings using Mistral AI embedding models.
• Returns the query as a vector for use with embedding retrievers.
• Configurable prefix and suffix text for custom formatting.
• Outputs usage metadata alongside the embedding.
• Lightweight component for query pipeline integration.

Configuration

Authentication

Create a secret with your Mistral API key. Use MISTRAL_API_KEY as the secret key. For instructions, see Create Secrets. Get your API key from Mistral AI.

1. Drag the MistralTextEmbedder component onto the canvas from the Component Library.
2. Click the component to open the configuration panel.
3. On the General tab:
   1. Enter the name of the Mistral embedding model to use, such as mistral-embed.
4. Go to the Advanced tab to configure the API key, API base URL, prefix and suffix text.

Connections

MistralTextEmbedder accepts a text string as input and outputs an embedding (list of floats) and a meta dictionary with model name and usage statistics.

Connect the Input component to its text input. Connect its embedding output to an embedding retriever to find semantically similar documents.

For embedding documents in indexes, use MistralDocumentEmbedder instead. Make sure to use the same model in both components.

Usage Example

This example shows a query pipeline that embeds a user query using Mistral and retrieves relevant documents.

components:
  MistralTextEmbedder:
    type: haystack_integrations.components.embedders.mistral.text_embedder.MistralTextEmbedder
    init_parameters:
      api_key:
        type: env_var
        env_vars:
        - MISTRAL_API_KEY
        strict: false
      model: mistral-embed
  EmbeddingRetriever:
    type: haystack_integrations.components.retrievers.opensearch.embedding_retriever.OpenSearchEmbeddingRetriever
    init_parameters:
      document_store:
        type: haystack_integrations.document_stores.opensearch.document_store.OpenSearchDocumentStore
        init_parameters:
          hosts:
          index: 'mistral-embeddings'
          max_chunk_bytes: 104857600
          embedding_dim: 1024
          return_embedding: false
          method:
          mappings:
          settings:
          create_index: true
          http_auth:
          use_ssl:
          verify_certs:
          timeout:
      top_k: 10

connections:
- sender: MistralTextEmbedder.embedding
  receiver: EmbeddingRetriever.query_embedding

max_runs_per_component: 100

metadata: {}

inputs:
  query:
  - MistralTextEmbedder.text
  - EmbeddingRetriever.query

outputs:
  documents: EmbeddingRetriever.documents

Parameters

Inputs

Parameter	Type	Default	Description
text	str		The string to embed.

Outputs

Parameter	Type	Default	Description
embedding	List[float]		The embedding of the input text.
meta	Dict[str, Any]		Information about the usage of the model, including model name and token usage.

Init Parameters

These are the parameters you can configure in Pipeline Builder:

Parameter	Type	Default	Description
api_key	Secret	Secret.from_env_var('MISTRAL_API_KEY')	The Mistral API key.
model	str	mistral-embed	The name of the Mistral embedding model to be used.
api_base_url	Optional[str]	https://api.mistral.ai/v1	The Mistral API Base url. For more details, see Mistral docs.
prefix	str		A string to add to the beginning of each text.
suffix	str		A string to add to the end of each text.
timeout	Optional[float]	None	Timeout for Mistral client calls. If not set, it defaults to either the OPENAI_TIMEOUT environment variable, or 30 seconds.
max_retries	Optional[int]	None	Maximum number of retries to contact Mistral after an internal error. If not set, it defaults to either the OPENAI_MAX_RETRIES environment variable, or set to 5.
http_client_kwargs	Optional[Dict[str, Any]]	None	A dictionary of keyword arguments to configure a custom httpx.Clientor httpx.AsyncClient. For more information, see the HTTPX documentation.

Run Method Parameters

These are the parameters you can configure for the component's run() method. This means you can pass these parameters at query time through the API, in Playground, or when running a job. For details, see Modify Pipeline Parameters at Query Time.

Parameter	Type	Default	Description
text	str		The string to embed.