Instructor vs OpenAI Text Embedding 3

Embedding model that takes a task instruction alongside the text.

Comparação de características

Comparação de Instructor e OpenAI Text Embedding 3
Característica	Instructor	OpenAI Text Embedding 3
Dimensions	768	1536 by default, 256 to 3072 selectable
License	Apache-2.0	Proprietary
Max tokens	512	8191
Open weights	Yes	No
Provider	HKU NLP	OpenAI

As linhas sombreadas são idênticas nos dois; as linhas que diferem são as que sustentam a recomendação abaixo.

Qual deve escolher?

Gerado a partir das diferenças acima por regras estruturadas, não por um modelo.

Choose Instructor if…

Nenhum dos atributos registados o distingue a seu favor.

Choose OpenAI Text Embedding 3 if…

Nenhum dos atributos registados o distingue a seu favor.

Instructor

model · Embedding Models

Instructor embeds text together with an instruction describing what the embedding is for, so one model serves retrieval, clustering and classification without fine-tuning for each. It solves the problem that a single fixed embedding cannot be optimal for several different tasks, and fine-tuning a copy per task is expensive and easy to get wrong. It exists because telling the model what kind of similarity you want is a cheap substitute for training it to want that.

OpenAI Text Embedding 3

model · Embedding Models

Text Embedding 3 is OpenAI's hosted embedding family, notable for letting the caller choose a shorter output vector than the model natively produces. It solves the storage problem directly: embedding indexes are sized by dimensions times vectors, so trimming 3072 dimensions to 512 or 256 shrinks the index substantially at a small quality cost. It exists because that trade is one the caller is better placed to make than the model author, and it removes the need to retrain to change it.