OpenCode ​

Using LongCat Models for AI Programming in OpenCode

Overview ​

LongCat series models are supported for use in OpenCode. This document describes how to integrate OpenCode with the LongCat API Open Platform.

Prerequisites ​

Install OpenCode CLI

  • Install OpenCode using curl
bash
curl -fsSL https://opencode.ai/install | bash
  • Install OpenCode using npm
bash
npm i -g opencode-ai

Configure LongCat API ​

  1. Run the authentication command
bash
opencode auth login

Authentication.png

  1. Select Provider

Select LongCat from the provider list (you can type LongCat to filter).

OpenCode ships with a built-in LongCat provider, so selecting Other is no longer required. If LongCat does not appear in the list, upgrade OpenCode to the latest version first.

other.png

  1. Enter API KEY

Enter your API Key. The API key will be stored in the following location; check auth.json to verify the API key is correct.

  • macOS / Linux: ~/.local/share/opencode/auth.json
  • Windows: press WIN+R and paste %USERPROFILE%\.local\share\opencode\auth.json

apikey.png

  1. (Optional) Custom Configuration

OpenCode ships with a built-in LongCat provider (the API endpoint and model list are preconfigured), so you can start using it right after authentication—no manual configuration needed.

If you want to customize the setup (for example, to disable thinking mode), open the OpenCode configuration directory

bash
- macOS / Linux: ~/.config/opencode/

- Windows: Users\***\.config\opencode

Create or edit the configuration file in that directory: opencode.json

file.png

opencode.json content

json
{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "longcat": {
      "models": {
        "LongCat-2.0": {
          "options": {
            "thinking": {
              "type": "disabled"
            }
          }
        }
      }
    }
  }
}

💡 About thinking mode: When using LongCat-2.0, the model supports controlling whether thinking is enabled via the thinking field in the request body, with values {"type":"enabled"} (thinking on) or {"type":"disabled"} (thinking off). It is enabled by default. In OpenCode, you can configure this field within the model's options, as shown in the example above—disabled turns thinking off, and enabled turns it on.

Supported Models

Model NameAPI FormatDescription
LongCat-2.0OpenAI/AnthropicHigh-performance Agentic model

Test CodingCode ​

Go back to the command line interface and type opencode to start using it

start.png

Use /models to switch the model to LongCat-2.0

models.png

Then enter your question and start the conversation

conversation.png