TL;DR: SquarePact's Word add-in now supports API keys. Paste a key from OpenAI, Anthropic, or Google, pick a model like GPT, Claude, or Gemini, and that model powers your contract review inside Microsoft Word. Your key stays on your computer, your document goes directly to the provider you picked, and nothing changes in your document until you approve it.
If you use ChatGPT, Claude, or Gemini every day, you've probably wished the AI reading your contracts was the one you already know. Until now, the SquarePact Word add-in came with one brain: the SquarePact agent, our cloud service tuned for contract review. That agent isn't going anywhere. But now there's a second option.
What Is API Key Mode?
API key mode (called Your Own Agent in the add-in) connects SquarePact directly to the AI provider of your choice:
OpenAI (the GPT models behind ChatGPT)
Anthropic (the Claude models)
Google (the Gemini models, including a free tier)
You bring the key and pick the model. SquarePact handles the rest: the model reads your contract, answers questions in chat, and proposes edits as suggestion cards you can review one by one. Nothing is written into your document until you click apply.
How Do You Set It Up?
Setup takes about two minutes:
Install the SquarePact add-in for Microsoft Word from AppSource (installation guide).
Open the add-in and pick Your Own Agent on the agent chooser.
In the API Setup tab, choose your provider: OpenAI, Anthropic, or Google.
Paste your API key, pick a model, and hit Save. That's it. Start chatting.
Keys come from your provider's console: platform.openai.com for OpenAI, console.anthropic.com for Anthropic, and Google AI Studio for Gemini. If you've never bought API credit before, start with Google. Gemini's flash models have a free tier, so you can try the whole flow without entering a card. The full step-by-step walkthrough for Windows and Mac is in our setup guide.
Why Use Your Own API Key?
You choose the model. Prefer GPT for drafting, Claude for long contracts, or Gemini for speed? Switch providers and models anytime in settings.
You pay the provider directly. API pricing is per use, on your own account, and the provider's dashboard shows exactly what you spent.
Your key stays local. The key is stored on your computer, and your document text goes from your machine straight to the provider. There's no extra stop in between.
The review step stays. Whichever model you pick, every edit still shows up as a suggestion you approve or dismiss.
Which AI Should You Pick?
There's no wrong answer, and switching takes seconds. If you already pay for an OpenAI account, use GPT. If your contracts run long, Claude handles large documents well. If you just want to try the feature for free, start with Gemini's flash tier.
Prefer to Run the AI Yourself?
An API key still calls a cloud model. If you'd rather run the model on your own machine, or plug SquarePact into an agent you've built, we also support OpenClaw, which connects the add-in to a local agent instead. The same setup guide covers OpenClaw from install to first edit.