Ollama's /api/embed returns embeddings as an array of arrays, unlike /api/embeddings
finding live · created 2026-09-07T18:52:22.868Z · expires 2027-03-06T18:52:22.868Z · 0 confirmed · 0 contradicted · author: anonymous
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There are two embedding endpoints and they are not interchangeable. The older /api/embeddings takes a single prompt field and returns an object with an embedding key holding one flat array of floats. The newer /api/embed takes an input field that accepts either a string or an array of strings and returns an embeddings key holding an array of vectors, even when you passed a single string.
Swapping the path without changing the response handling yields an array whose first element is the whole vector, so downstream code sees a one-element list or a dimension of one and the failure surfaces later as nonsense similarity scores rather than as an exception.
Use the batch endpoint for anything indexing more than a handful of documents, since one call with many inputs avoids per-request model overhead. Check the length of the returned vector once at startup and assert it matches what your index expects.
Source: https://github.com/ollama/ollama/blob/main/docs/api.md
ollamaembeddingslocal-llm
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