Launching October 2026 · Join the waitlist →
Nuxa
Join the waitlist

Connect your AI

Connect OpenAI

GPT models with an API key

1At a glance

How it connects
Connects with an API key What’s an API key?
Cost
Pay-as-you-go; add credit before the first request
With a free account
Signing up and creating a key are free, but the key needs a little credit before it answers. See the limits below.
Research
Built-in web search

2Step by step

5 steps. Nuxa shows you these same steps, one at a time.

  1. Step 1

    Sign in to the OpenAI Platform

    Nuxa opens the OpenAI Platform key page in your web browser. Sign in, or create a free account.

    Button in Nuxa: Open OpenAI Platform

    Open platform.openai.com/api-keys

    Trouble with this step?

  2. Step 2

    Click “Create new secret key”

    On the API keys page, click Create new secret key, name it Nuxa, and click Create.

    Button in Nuxa: I've created a key

    Trouble with this step?

  3. Step 3

    Click “Copy”

    Copy the key now — OpenAI shows it only once. It starts with “sk-proj-” (older keys: “sk-”).

    Button in Nuxa: I've copied it

    Trouble with this step?

  4. Step 4

    Nuxa finds your key

    Come back to Nuxa: it offers the key it finds on your clipboard. Or click Paste key.

    Button in Nuxa: Paste key

    Trouble with this step?

  5. Step 5

    Checking your key…

    Nuxa sends one tiny test message to OpenAI, then keeps the key in your Mac's Keychain.

    Button in Nuxa: Test again

    Trouble with this step?

3Free account limits, in plain words

Pay-as-you-go; add credit before the first request. Here’s what happens if you hit a limit, and what to do.

When you’ve used your allowance, Nuxa says:

OpenAI is limiting requests for now. Wait a minute and try again, or choose another AI.

When the account has no credit, Nuxa says:

OpenAI says your account has no credit yet. Add credit or a payment method on the OpenAI Platform website, then click Test again, or choose a free option.

Wait

Wait a little

Most limits clear within a minute; free daily limits reset overnight. Then click Test again in Nuxa.

Upgrade

Add credit or upgrade

Add credit or a payment method on the OpenAI Platform.

Switch

Choose another AI

Free choices: Google Gemini, Ollama on your Mac, or ChatGPT. You can switch any time.

4Troubleshooting

Tap a problem to see the fix.

Step 1 Sign in to the OpenAI Platform

I have ChatGPT Plus; isn't that enough?
ChatGPT plans and the OpenAI API are separate. To use your ChatGPT account instead, go back and choose Sign in with ChatGPT.
The page didn't open
Open your web browser yourself and go to platform.openai.com/api-keys.
The page won't load
Check that you're online. A VPN or work network may block it; try another network.

Step 2 Click “Create new secret key”

It asks me to verify my phone
OpenAI may ask for a phone number before the first key.
It asks me to add credit
The API needs credit before it answers. Add some under Billing, then come back.

Step 3 Click “Copy”

I closed it before copying
Most services show a key only once. Create another key and copy that one.
I can't find a copy button
Select the whole key and press ⌘C.

Step 4 Nuxa finds your key

Nuxa says it looks like a different kind of key
You may have copied a key from another service. Go back to the key page and copy the key again with its Copy button.
Nuxa says the key looks incomplete
Part of it was missed. Use the Copy button next to the key rather than selecting it by hand.
macOS asks whether Nuxa may paste
Click Allow Paste. Nuxa only looks at the clipboard when you click Paste key, or when you come back to Nuxa during this step.
Paste key does nothing
Copy the key again, then click Paste key. Or click into the box under the button and press ⌘V.

Step 5 Checking your key…

OpenAI didn't accept the key
Copy the whole key again with its Copy button and paste it. If you deleted the key on the website, create a new one.
It says the limit was reached
OpenAI is limiting requests for now. Wait a minute and try again, or choose another AI.
It says there's no credit
OpenAI says your account has no credit yet. Add credit or a payment method on the OpenAI Platform website, then click Test again, or choose a free option.
It says Nuxa couldn't reach OpenAI
Check that you're online. A VPN, a work firewall or a content filter can block it; try switching the VPN off.

Any step Something else

I'm offline
Setting up needs the internet (except a model that's already on your Mac). Connect, then try the step again.
I use a VPN or a work network
VPNs and work firewalls sometimes block AI services. Try with the VPN off, or on another network.
macOS asks for permission
Nuxa may ask to paste from the clipboard or to open a web page. Click Allow; nothing happens without your click.
Nothing seems to happen
Click Check again, or go Back one step and try again. If you're stuck, click Get help — it tells us which step you're on.

5Still stuck?

Email us and tell us which step you’re on. A human reads every message.

Email info@getnuxa.com

6Last checked September 25, 2026

← Choose a different AI