Using 123API in Cursor

Configure Cursor to access 123API through the OpenAI-compatible base URL.

Prerequisites

Open Cursor settings and find the model configuration section.

Fill in:

Field	Value
API Key	Your 123API API key
Base URL	`https://123api.co/v1`

Cursor works well with OpenAI-compatible APIs, so the main change is the base URL and your model selection.

Recommended examples:

Cursor lets you use different models for different workflows:

Chat: general coding help and planning
Autocomplete: fast suggestions, usually better with cheaper low-latency models
Quick Edit / Cmd+K: targeted code rewrites or transformations

If your plan allows it, use a faster model for autocomplete and a stronger model for chat or complex edits.

Cursor cannot connect+

Confirm the Base URL includes /v1, the API key is valid and your local environment can access https://123api.co.

Responses are slow+

Try a faster model, reduce prompt size and check your local network latency.

Autocomplete works but chat fails+

Recheck the model selected for chat, confirm it is supported by your account and verify the API key has sufficient balance.