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Model

LFM2.5 ColBERT 350M

Use it in a supported document-search workflow. It does not generate chat answers. 8GB RAM estimate. Best use: Multilingual retrieval where higher accuracy matters more than index size.

0.353BEmbedding

Best use

Multilingual retrieval where higher accuracy matters more than index size.

Memory planning

8GB RAM estimate

Expected pace

Depends on your hardware, app, and conversation length

License

LFM Open License v1.0; read the model’s terms before use

Who should use this model?

  • Multilingual retrieval where higher accuracy matters more than index size.

Choose something else when

  • You need the smallest possible index or a simple single-vector embedding pipeline.

What hardware makes sense?

The download is only part of the memory needed. Leave room for the app, the input it processes, and other open programs. Document-search memory also depends on input length, batch size, and the document index; a chat-memory estimate does not confirm that workload.

CPU only
A possible starting point with a compressed model and short conversation; check the exact file size.
8GB system memory
A possible starting point with a compressed model and short conversation; check the exact file size.
16GB system memory
A possible starting point with a compressed model and short conversation; check the exact file size.
32GB system memory
A possible starting point with a compressed model and short conversation; check the exact file size.
8GB GPU memory
Not required
12GB GPU memory
Not required
24GB GPU memory
Not required
Apple unified memory
A possible starting point with a compressed model and short conversation; check the exact file size.

Model facts that change the decision

Parameters
0.353B
Input
Text
Published context limit
512 tokens
Model format
safetensors · GGUF · llama.cpp
Suggested compression
Use an official artifact supported by the chosen retrieval runtime.
Languages
Arabic · German · English · Spanish · French · Italian · Japanese · Korean

Using this model for document search

Select this model for the document-search step in an app that supports it. Keep the model that generates answers separate. Check document chunk length and any required query or document prefixes in the model’s instructions.

Changing the embedding model changes the document vectors. Rebuild the document index rather than mixing vectors from different models.

First setup

llama.cpp

Use the official GGUF repository with current reranking support.

Conditions that change the answer

  • Per-token vectors create a larger index than the companion embedding model.
  • The 512-token document limit requires chunking longer material.
  • The custom license includes a commercial-use revenue threshold.

Read the controlling license text →