ChatGPT broke link previews as of writing this (2023-08-02) so this userscript removes them as they're added.

chatgpt_remove_link_previews.user.js

// ==UserScript==
// @name         ChatGPT Remove Link Previews
// @namespace    http://zod.tf/
// @version      1.0.1
// @description  Disable link previews on ChatGPT interface
// @author       zudsniper
// @icon         https://chat.openai.com/favicon.ico
// @match        https://chat.openai.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // heres the raw gist link to this file without a commit version
    // https://gist.github.com/zudsniper/14abaa7a89f5636764d9509430c70abc/raw/chatgpt_remove_link_previews.user.js
    
    // Create an observer instance linked to the callback function
    const observer = new MutationObserver((mutationsList, observer) => {
        // Look through all mutations that just occured
        for(let mutation of mutationsList) {
            // If the addedNodes property has one or more nodes
            if(mutation.addedNodes.length){
                mutation.addedNodes.forEach(node => {
                    if(node.querySelector){
                        let linkPreviews = node.querySelectorAll('div.relative.h-full.w-full');
                        linkPreviews.forEach(link => link.style.display = "none");
                    }
                });
            }
        }
    });

    // Start observing the document with the configured parameters
    observer.observe(document, { childList: true, subtree: true });
})();