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Connect your ChatGPT account

Sign in to ChatGPT for the in-app Stellaris Advisor and Chronicle, choose a model, and ask your first campaign question.

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Use your ChatGPT account for the Advisor and Chronicle inside Stellaris Companion. No OpenAI API key is needed. Account and workspace eligibility and ChatGPT plan usage limits apply.

Connect in three steps

  1. Install and open Companion. Choose the installer for your platform. On macOS, choose Apple silicon or Intel to match your Mac.
  2. Select Continue with ChatGPT. On the Connect your advisor step, choose ChatGPT. Finish signing in with OpenAI in your browser and return to Companion. The app checks and saves the connection automatically.
  3. Connect your save folder. Finish setup, select your campaign, and wait for a save to load. Open the Advisor and ask a question.

Already using Companion? Open Config → Chat in Companion → ChatGPT, then continue with the same browser sign-in.

Ask a first question

What is causing my energy deficit, and what should I change first?

How much naval capacity do I have left, and what should I check before my next war?

Companion adds relevant campaign context from your local save. You do not need to upload the raw .sav to ChatGPT or write a separate briefing.

Models and usage

The app chooses GPT-5.6 Terra when available and marks it Recommended. Luna is marked Lower usage. Other available choices appear under More models.

Change the ChatGPT model beneath the Advisor input, in Chronicle, or in Config. Your choice is saved per account and applies to Advisor and Chronicle on the next request. Changing it does not interrupt a reply already in progress.

Advisor answers and Chronicle generation use your ChatGPT plan allowance. Select Manage usage to open ChatGPT settings and review plan and app limits. Use the lower-usage option when you want to conserve your allowance; it still consumes usage.

If sign-in or a response fails

  • Sign-in does not finish: return to Companion after browser approval. If the connection is still missing, start sign-in again from Config.
  • Account or workspace unavailable: access depends on eligibility during OpenAI’s preview. Try an eligible account or another provider.
  • Usage limit reached: open Manage usage, check the reset or app limits, and wait for allowance or choose another provider. Changing models does not guarantee more available usage.
  • No campaign context: confirm that the correct campaign is selected and at least one save has loaded. See save detection.

What OpenAI receives

Your question or Chronicle instruction and relevant extracted campaign context are sent to OpenAI. Raw saves and the parsed campaign archive remain on your computer. Sign-in does not give Companion access to your existing ChatGPT conversations.

Credentials use the operating system’s protected storage. If protected storage is unavailable, the connection lasts only for the current session. See privacy and data flow.

This guide covers the in-app connection. To use an external AI app instead, see local MCP connections.