01 — Configure OpenCode

create ~/.config/opencode/opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "LlamaBarn": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "http://localhost:2276/v1"
      },
      "models": {
        "LlamaBarn-model": {}
      }
    }
  }
}

Note: LlamaBarn-model refers to any model you have running in LlamaBarn. If you're using a specific model and don't plan to switch models often, you can use that model's name directly, e.g., GPT-OSS 120B.

02 — Run OpenCode and select LlamaBarn-model

Type /models to bring up the model selection menu, then choose LlamaBarn-model.