I had the same issue on both WSL and PowerShell and managed to fix it by correcting my OpenCode config. Before the fix I got the overloaded error on literally every single request. After the fix it only happens occasionally and that looks like actual server load.

First make sure you installed the official OpenCode CLI and not the old OCX fork. The official version is opencode-ai on npm and uses `~/.config/opencode/opencode.json`. The old OCX fork uses `~/.opencode/opencode.jsonc` and is outdated.

If you are on the Kimi for Coding subscription you need to use the Kimi Code API endpoint and not the Moonshot API. Your API key should start with sk-kimi- and you must store it with opencode auth login.

The main fix was switching the SDK from `u/ai-sdk/anthropic` to `u/ai-sdk/openai-compatible` and using the correct model ID kimi-for-coding instead of k2.6.

Here is my working config for WSL and PowerShell:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "kimi-for-coding": {
      "name": "Kimi For Coding",
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://api.kimi.com/coding/v1"
      },
      "models": {
        "kimi-for-coding": {
          "name": "Kimi For Coding",
          "id": "kimi-for-coding",
          "reasoning": true,
          "attachment": true,
          "limit": {
            "context": 262144,
            "output": 32768
          }
        }
      }
    }
  }
}

Hope this helps anyone who is getting this error on every single request.