What models does a knowledge base need?

Retrieval needs an embedding model, so also add a model tagged Embedding for embeddings.

Am I charged when a workflow fails?

Failed model calls are free, but nodes that already succeeded in the workflow are billed normally.

Connect Dify

Updated 2026-09-23

Low-code platform that wires models into workflows, agents, and RAG apps.

Use cases

Good for wiring models into visual workflows, agents and knowledge-base Q&A apps. After adding an OpenAI-compatible provider, pick this platform's models in any node.

Tips

Workflows call models in bulk and unattended. Set a monthly spend limit on the key and watch the failure rate in usage.

If it cannot connect

Use https://omnimodel.me/v1 as the API host, without /chat/completions.
The key starts with key_ and is not paused or revoked; auth.invalid_key means the key cannot be used.
The model ID matches the catalog and is in the key's allowed models.
billing.insufficient_credit means the balance is too low; see common errors for more.

Setup

Go to Settings → Model Provider and choose OpenAI-API-compatible.
Fill in the model name, API key, and API endpoint URL.
Save, then select the model inside your app.

Settings

API host：https://omnimodel.me/v1
API key：YOUR_API_KEY
Model：MODEL_ID

FAQ

What models does a knowledge base need?: Retrieval needs an embedding model, so also add a model tagged Embedding for embeddings.
Am I charged when a workflow fails?: Failed model calls are free, but nodes that already succeeded in the workflow are billed normally.