Globally override model and thinking_effort on chatgpt.com
// ==UserScript==
// @name chatgpt model selection
// @namespace https://loongphy.com
// @version 1.3.4
// @description Globally override model and thinking_effort on chatgpt.com
// @author loongphy
// @match https://chatgpt.com/*
// @icon https://chatgpt.com/favicon.ico
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @run-at document-start
// ==/UserScript==
(function () {
"use strict";
// ================================================================
// Config
// ================================================================
const K_MODEL = "model";
const K_EFFORT = "effort";
function getModel() {
return GM_getValue(K_MODEL, "thinking");
}
function getEffort() {
return GM_getValue(K_EFFORT, "extended");
}
function saveModel(v) {
GM_setValue(K_MODEL, v);
}
function saveEffort(v) {
GM_setValue(K_EFFORT, v);
}
// ================================================================
// Patch body for conversation requests
// ================================================================
function isConv(url) {
return (
typeof url === "string" &&
url.includes("/backend-api/f/conversation")
);
}
function patchBody(bodyStr) {
const data = JSON.parse(bodyStr);
const m = getModel();
if (m === "thinking") {
data.model = "gpt-5-5-thinking";
data.thinking_effort = getEffort();
} else {
data.model = "gpt-5-5";
delete data.thinking_effort;
}
return JSON.stringify(data);
}
// ================================================================
// Fetch interceptor — hooks all references
// ================================================================
function hookFetch(scope) {
if (!scope || !scope.fetch) return;
const orig = scope.fetch;
scope.fetch = function (input, init) {
const url = typeof input === "string" ? input : input?.url;
if (
isConv(url) &&
init?.method === "POST" &&
typeof init.body === "string"
) {
try {
return orig.call(scope, input, {
...init,
body: patchBody(init.body),
});
} catch (_) {}
}
return orig.call(scope, input, init);
};
}
hookFetch(unsafeWindow || window);
hookFetch(globalThis);
hookFetch(self);
// Re-hook in case framework replaces window.fetch after boot
setInterval(function () {
const w = unsafeWindow || window;
const cur = w.fetch;
if (cur !== w._cmsFetch) {
hookFetch(w);
w._cmsFetch = w.fetch;
}
}, 2000);
// ================================================================
// XHR interceptor
// ================================================================
var XHR = (unsafeWindow || window).XMLHttpRequest;
if (XHR) {
var proto = XHR.prototype;
var origOpen = proto.open;
var origSend = proto.send;
proto.open = function (method, url) {
this._cmsUrl = typeof url === "string" ? url : String(url);
return origOpen.apply(this, arguments);
};
proto.send = function (body) {
if (isConv(this._cmsUrl) && typeof body === "string") {
try {
return origSend.call(this, patchBody(body));
} catch (_) {}
}
return origSend.apply(this, arguments);
};
}
// ================================================================
// Settings panel
// ================================================================
function openSettings() {
var old = document.getElementById("cms-ui");
if (old) old.remove();
var model = getModel();
var effort = getEffort();
var isDark = document.documentElement.classList.contains("dark");
var t = isDark
? {
bg: "#353535",
fg: "#e5ebfa",
fg2: "#9198a1",
fg3: "#656c76",
hover: "rgba(255,255,255,0.1)",
pill: "rgba(255,255,255,0.06)",
pillActive: "rgba(255,255,255,0.12)",
shadow: "rgba(0,0,0,0.32) 0 8px 16px 0, rgba(255,255,255,0.15) 0 0 0 0.5px inset",
accent: "#7ab7ff",
btnText: "#0d0d0d",
}
: {
bg: "#fff",
fg: "#0d0d0d",
fg2: "#5d5d5d",
fg3: "#8f8f8f",
hover: "rgba(0,0,0,0.06)",
pill: "rgba(0,0,0,0.04)",
pillActive: "#fff",
shadow: "rgba(0,0,0,0.12) 0 8px 24px 0, rgba(0,0,0,0.05) 0 0 0 0.5px inset",
accent: "#2964aa",
btnText: "#fff",
};
var font =
'"HarmonyOS Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif';
function make(tag, css, kids) {
var el = document.createElement(tag);
if (css) Object.assign(el.style, css);
if (kids)
kids.forEach(function (k) {
el.appendChild(
typeof k === "string" ? document.createTextNode(k) : k,
);
});
return el;
}
function lbl(text) {
return make(
"div",
{
fontSize: "13px",
fontWeight: "500",
color: t.fg2,
marginBottom: "8px",
},
[text],
);
}
function pills(opts, cur, cb) {
var c = make("div", {
display: "flex",
gap: "4px",
background: t.pill,
borderRadius: "10px",
padding: "3px",
marginBottom: "16px",
});
var bg = isDark ? t.pillActive : "#fff";
var btns = [];
opts.forEach(function (_a) {
var label = _a.label,
value = _a.value;
var act = value === cur;
var b = make(
"button",
{
flex: "1",
padding: "6px 12px",
border: "none",
borderRadius: "8px",
background: act ? bg : "transparent",
color: act ? t.fg : t.fg2,
fontSize: "13px",
fontWeight: act ? "500" : "400",
cursor: "pointer",
transition: "all 0.12s",
},
[label],
);
b.addEventListener("click", function () {
btns.forEach(function (x) {
x.style.background = "transparent";
x.style.color = t.fg2;
x.style.fontWeight = "400";
});
b.style.background = bg;
b.style.color = t.fg;
b.style.fontWeight = "500";
cb(value);
});
c.appendChild(b);
btns.push(b);
});
return c;
}
var overlay = make("div", {
position: "fixed",
inset: "0",
zIndex: "999999",
background: "rgba(0,0,0,0.4)",
display: "flex",
alignItems: "center",
justifyContent: "center",
fontFamily: font,
});
overlay.id = "cms-ui";
overlay.addEventListener("click", function (e) {
if (e.target === overlay) overlay.remove();
});
var panel = make("div", {
background: t.bg,
borderRadius: "16px",
boxShadow: t.shadow,
padding: "20px",
minWidth: "320px",
maxWidth: "380px",
color: t.fg,
fontSize: "14px",
lineHeight: "1.5",
});
panel.addEventListener("click", function (e) {
e.stopPropagation();
});
// header
panel.appendChild(
make(
"div",
{
fontSize: "16px",
fontWeight: "600",
marginBottom: "16px",
display: "flex",
alignItems: "center",
justifyContent: "space-between",
},
[
make("span", {}, ["Model Override"]),
(function () {
var b = make(
"button",
{
background: "none",
border: "none",
color: t.fg2,
fontSize: "18px",
cursor: "pointer",
padding: "2px 6px",
borderRadius: "6px",
lineHeight: "1",
},
["✕"],
);
b.addEventListener("mouseenter", function () {
b.style.background = t.hover;
});
b.addEventListener("mouseleave", function () {
b.style.background = "none";
});
b.addEventListener("click", function () {
overlay.remove();
});
return b;
})(),
],
),
);
// model type
panel.appendChild(lbl("Model"));
var curModel = model;
panel.appendChild(
pills(
[
{ label: "Instant", value: "instant" },
{ label: "Thinking", value: "thinking" },
],
curModel,
function (v) {
curModel = v;
toggleEffort();
},
),
);
// thinking effort
var effortWrap = make("div", {});
effortWrap.appendChild(lbl("Thinking Effort"));
var curEffort = effort;
effortWrap.appendChild(
pills(
[
{ label: "Standard", value: "standard" },
{ label: "Extended", value: "extended" },
],
curEffort,
function (v) {
curEffort = v;
},
),
);
panel.appendChild(effortWrap);
function toggleEffort() {
effortWrap.style.display =
curModel === "thinking" ? "block" : "none";
}
toggleEffort();
// save
var saveBtn = make(
"button",
{
width: "100%",
marginTop: "16px",
padding: "10px",
border: "none",
borderRadius: "10px",
background: t.accent,
color: t.btnText,
fontSize: "14px",
fontWeight: "600",
cursor: "pointer",
transition: "opacity 0.12s",
},
["Save"],
);
saveBtn.addEventListener("mouseenter", function () {
saveBtn.style.opacity = "0.85";
});
saveBtn.addEventListener("mouseleave", function () {
saveBtn.style.opacity = "1";
});
saveBtn.addEventListener("click", function () {
saveModel(curModel);
saveEffort(curEffort);
overlay.remove();
});
panel.appendChild(saveBtn);
overlay.appendChild(panel);
document.documentElement.appendChild(overlay);
}
GM_registerMenuCommand("⚙️ Model Override Settings", openSettings);
})();