Milvus "field dimension mismatch" Error

How to fix it

Try these in order — the most common fix is first.

1. 1. Match dim to model

   Copy steps
   1. Check your model output size (for example 1536 for text-embedding-3-small, 384 for all-MiniLM-L6-v2)
   2. Create the collection with that dim
   Did this fix it? Yes No

2. 2. Fix an existing wrong collection

   Copy steps
   1. Drop the collection (data is lost)
   2. Recreate with the right dim, rebuild index, load, re-ingest
   Did this fix it? Yes No

3. 3. Avoid it later

   1. Use one collection per embedding model
   Did this fix it? Yes No

Symptoms

Insert or search fails: field dimension mismatch, expected 1536, got 768.

Why it happens

• Schema dim differs from embedding model output
• Switched embedding model without a new collection

This guide also covers

• milvus dimension mismatch
• milvus vector dimension error

The same problem in other apps

All not loading, error messages & connection guides →

• Pinecone 429 Too Many Requests Error (Pinecone)
• Weaviate Error: Vector Lengths Don't Match (Weaviate)
• Qdrant "Wrong input: Vector dimension error: expected dim, got" (Qdrant)
• Chroma "Your system has an unsupported version of sqlite3" Error (Chroma)

Other Milvus errors

• Milvus "collection not loaded" Error
• Milvus Query Node Out of Memory (OOM)
• Milvus Connection Refused / Timeout (19530)
• Milvus etcd and MinIO Dependency Errors
• Why Is Milvus Search Slow?
• Milvus "index not exist" Error
• Milvus Search Returns Empty Results After Insert
• How to Cancel Zilliz Cloud (Milvus) Subscription