goose with SeibertGPT

Add the provider in goose

Menu at the top left → Settings → “Models” tab → “Configure providers” → at the very bottom “Add Custom Provider”. Enter these values and click “Create Provider”:

Provider Type

OpenAI Compatible

Display Name

SeibertGPT

API URL

https://api.seibert.ai/v1

API Key

your SeibertGPT key (sgpt_…)

Available Models

deepseek-v41-flash, deepseek-v41-flash-fast, deepseek-v41-flash-low, deepseek-v41-flash-high, deepseek-v41-flash-max

Streaming Support

on

Choose the model

At the bottom of the chat window, choose “SeibertGPT” and the model deepseek-v41-flash-fast. goose stores the key in the Keychain.

Optional: your plan's context limit

The GUI doesn't set a context limit (goose then assumes 128,000). For 1,000,000 tokens, download the file below and put it in the folder shown – it replaces the provider from the GUI; enter the key under “Configure” for the SeibertGPT provider.

File: ~/.config/goose/custom_providers/custom_seibertgpt.json · Download custom_seibertgpt.json

{
  "name": "custom_seibertgpt",
  "engine": "openai",
  "display_name": "SeibertGPT",
  "description": "SeibertGPT – DeepSeek, operated in the EU",
  "api_key_env": "CUSTOM_SEIBERTGPT_API_KEY",
  "base_url": "https://api.seibert.ai/v1",
  "models": [
    {
      "name": "deepseek-v41-flash",
      "context_limit": 1000000,
      "supports_vision": true
    },
    {
      "name": "deepseek-v41-flash-fast",
      "context_limit": 1000000,
      "supports_vision": true
    },
    {
      "name": "deepseek-v41-flash-low",
      "context_limit": 1000000,
      "supports_vision": true
    },
    {
      "name": "deepseek-v41-flash-high",
      "context_limit": 1000000,
      "supports_vision": true
    },
    {
      "name": "deepseek-v41-flash-max",
      "context_limit": 1000000,
      "supports_vision": true
    }
  ],
  "supports_streaming": true,
  "requires_auth": true,
  "dynamic_models": false
}