OpenCode Setup Guide

OpenCode can connect Claude and GPT models from one configuration file.

Model family	Base URL
Claude / Anthropic	`https://api.codyrouter.com/v1`
GPT / OpenAI	`https://api.codyrouter.com/v1`

Configuration Files

Common OpenCode paths:

Model config: ~/.config/opencode/opencode.jsonc
Auth config: ~/.local/share/opencode/auth.json

You can put the API key directly in options.apiKey in opencode.jsonc and keep auth.json as an empty object. Model IDs can use either provider/model-id or plain model-id.

jsonc

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "anthropic": {
      "options": {
        "baseURL": "https://api.codyrouter.com/v1",
        "apiKey": "YOUR_API_KEY"
      },
      "npm": "@ai-sdk/anthropic"
    },
    "openai": {
      "options": {
        "baseURL": "https://api.codyrouter.com/v1",
        "apiKey": "YOUR_API_KEY"
      },
      "models": {
        "gpt-5.3-codex": {
          "name": "GPT-5.3 Codex",
          "limit": { "context": 400000, "output": 128000 },
          "options": { "store": false },
          "variants": { "low": {}, "medium": {}, "high": {}, "xhigh": {} }
        }
      }
    }
  }
}

If ~/.local/share/opencode/auth.json exists and does not need credentials, keep it as:

json

{}

Checklist

Claude and GPT use /v1.
Model IDs can be written as openai/gpt-5.3-codex or gpt-5.3-codex, but the model name must match Model IDs.
JSON / JSONC syntax errors prevent OpenCode from loading the configuration.

Restart OpenCode after saving the configuration. If the model appears and replies to a test message, the setup is complete.

OpenCode Setup Guide ​

Configuration Files ​

Checklist ​

OpenCode Setup Guide

Configuration Files

Checklist