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Why 1536 dimensions?

Why do embedding models so often use 1536 dimensions specifically? I understand why hardware-friendly multiples like 64/128/256/512 are desirable. What I’m curious about is the specific choice of 1536 = 3×512 . OpenAI has used 1536-dimensional embeddings, and other vendors also offer/recommend 1536…

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Timeline · 2 reports

  1. 2026-10-03 05:38 · r/OpenAI
    Why 1536 dimensions?
  2. 2026-10-03 05:36 · r/LanguageTechnology
    Why 1536 dimensions for embedding models?

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