Predictive text in ChatGPT: how Lightkey helps you write prompts faster
Yes, Lightkey works in ChatGPT. ChatGPT writes the answer, but you still type the prompt. As you write it, Lightkey predicts your next words in grey right where you're typing. Press Tab to accept, or keep typing. It also suggests spelling corrections as you go.
How it works
Install the Lightkey desktop app and open the ChatGPT app for Windows. Predictions appear in the message box.
Using ChatGPT in the browser? Add the Lightkey extension for Chrome or Edge; it works together with the desktop app.
What it helps you write in ChatGPT
Good prompts tend to repeat: the same context, the same instructions, the same format requests. Lightkey learns yours, for example:
“Summarize this in three bullet points.”
“Keep the tone professional but friendly.”
“Rewrite this for a non-technical audience.”
“Use British English and keep it under 150 words.”
Lightkey also works in Microsoft Copilot, Claude, Gemini and Perplexity.
Your prompts, typed on your device
Lightkey predicts as you type, on your own computer. It doesn't send your prompts any where; only ChatGPT receives what you send it.
Get started
Download Lightkey and start your free 30-day trial.
Install the Lightkey extension for Chrome or Edge if you also work in the browser.
Open ChatGPT and start typing. Press Tab to accept a prediction.
Lightkey works in more than 80 languages and in virtually every app on your Windows PC. See all supported apps.
Also read: predictive text in Notion and Google Docs.
Frequently asked questions
Does Lightkey work in ChatGPT?
Yes. Lightkey works in the ChatGPT app for Windows and, through the Chrome or Edge extension, in ChatGPT in the browser.
Why use predictive text if ChatGPT writes for me?
ChatGPT writes the answer, but you still type the prompt. Lightkey predicts the phrases you repeat in your prompts, so you write them faster and with fewer typos.
Does Lightkey send my prompts anywhere?
No. Lightkey's prediction engine runs on your computer. Only ChatGPT receives the prompts you send it.
Does Lightkey work in other AI assistants?
Yes, including Microsoft Copilot, Claude, Gemini and Perplexity.
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