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New Search API AvailableDense vector search, hybrid search, and more are available in the new powerful Search API for Chroma Cloud databases.
The Query API enables nearest-neighbor similarity search over dense embeddings. Use the Get API when you want to retrieve records without similarity ranking.

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Query

You can query a collection to run a similarity search using .query:
collection.query(
    query_texts=["thus spake zarathustra", "the oracle speaks"]
)
Chroma will use the collection’s embedding function to embed your text queries, and use the output to run a vector similarity search against your collection.Instead of providing query_texts, you can provide query_embeddings directly. You will be required to do so if your collection does not have an embedding function attached to it. The dimension of your query embedding must match the dimension of the embeddings in your collection.Python also supports query_images and query_uris as query inputs.
collection.query(
    query_embeddings=[[11.1, 12.1, 13.1], [1.1, 2.3, 3.2]]
)
By default, Chroma will return 10 results per input query. You can modify this number using the n_results argument:
collection.query(
    query_embeddings=[[11.1, 12.1, 13.1], [1.1, 2.3, 3.2]],
    n_results=100
)
The ids argument lets you constrain the search only to records with the IDs from the provided list:
collection.query(
    query_embeddings=[[11.1, 12.1, 13.1], [1.1, 2.3, 3.2]],
    n_results=100,
    ids=["id1", "id2"]
)
Both query and get support where for metadata filtering and where_document for full-text search and regex:
collection.query(
    query_embeddings=[[11.1, 12.1, 13.1], [1.1, 2.3, 3.2]],
    n_results=100,
    where={"page": 10}, # query records with metadata field 'page' equal to 10
    where_document={"$contains": "search string"} # query records with the search string in the records' document
)

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Get

Use .get to retrieve records by ID and/or filters without similarity ranking:
collection.get(ids=["id1", "id2"]) # by IDs

collection.get(limit=100, offset=0) # with pagination

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Results Shape

Chroma returns .query and .get results in column-major form (arrays per field). .query results are grouped per input query; .get results are a flat list of records. 
class QueryResult(TypedDict):
    ids: List[IDs]
    embeddings: Optional[List[Embeddings]]
    documents: Optional[List[List[Document]]]
    uris: Optional[List[List[URI]]]
    metadatas: Optional[List[List[Metadata]]]
    distances: Optional[List[List[float]]]
    included: Include

class GetResult(TypedDict):
    ids: List[ID]
    embeddings: Optional[Embeddings]
    documents: Optional[List[Document]]
    uris: Optional[URIs]
    metadatas: Optional[List[Metadata]]
    included: Include
In the results from the Get operation, corresponding elements in each array belong to the same document. 
result = collection.get(include=["documents", "metadatas"])
for id, document, metadata in zip(result["ids"], result["documents"], result["metadatas"]):
    print(id, document, metadata)
Query is a batch API and returns results grouped per input. A common pattern is to iterate over each query’s “batch” of results, then iterate within that batch. 
result = collection.query(query_texts=["first query", "second query"])
for ids, documents, metadatas in zip(result["ids"], result["documents"], result["metadatas"]):
    for id, document, metadata in zip(ids, documents, metadatas):
        print(id, document, metadata)

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Choosing Which Data is Returned

By default, Query returns documents, metadatas, and distances, and Get returns documents and metadatas. Use include to control what comes back. ids are always returned. 
collection.query(
    query_texts=["my query"],
    include=["documents", "metadatas", "embeddings"],
)

collection.get(include=["documents"])