Where Is Grok Custom Instructions in Settings? (2026 Guide)

Elon Musk's AI chatbot Grok has been quietly building one of the most powerful personalization systems among all major AI tools — and if you haven't touched the Custom Instructions feature yet, you're seriously leaving power on the table. Whether you're a content creator, developer, marketer, or just someone who's tired of repeating themselves every single chat session, Custom Instructions in Grok can change how you use AI forever.

But here's the problem: a lot of users still can't figure out where this feature actually lives inside Grok's interface. The settings menu isn't always the most obvious place to look, and xAI has continued to update the UI through 2025 and into 2026. What worked six months ago might have shifted. The toggle you're looking for might now have a different name.

This guide covers every platform — grok.com (web), Grok mobile app on iOS and Android, and the embedded Grok experience inside the X app — so no matter where you use Grok, you'll know exactly where to find Custom Instructions, how to write them effectively, and how to get the most out of them in 2026.

What Are Grok Custom Instructions and Why Do They Matter?

Before diving into where to find them, it helps to understand what Grok Custom Instructions actually are. In simple terms, they are persistent behavioral guidelines you write once that apply to every single conversation you have with Grok — automatically, without you needing to re-explain yourself.

Think of it this way: every time you start a fresh Grok conversation without custom instructions, Grok treats you like a complete stranger. It doesn't know your profession, your goals, your preferred tone, or the kind of output format you like. You end up retyping a paragraph of context at the beginning of every session like a broken record.

Custom Instructions fix that. You tell Grok who you are, what you want, and how you want it to communicate — and that context sticks across all your future chats.

The feature is split into two core input fields. The first asks what you want Grok to know about you — this is where you share your background, profession, expertise level, ongoing projects, and goals. The second asks how you want Grok to respond — covering tone, format preferences, level of detail, and any communication rules you want enforced.

Once saved, these instructions become the invisible foundation of every Grok response you receive. That's not a minor feature. That's the difference between a generic AI tool and a personalized AI assistant.

Where to Find Grok Custom Instructions on the Web (grok.com)

The most feature-complete way to access and manage Grok Custom Instructions is through the web interface at grok.com. xAI has consistently rolled out new features here first before pushing them to mobile and the X app, so if you want full control, the browser version is your best friend.

Here is how to find Custom Instructions on grok.com in 2026:

Open your browser and navigate to grok.com. Log in with your xAI account or your X (formerly Twitter) account credentials. Once you're inside the main Grok chat interface, look at the left sidebar — this is where the primary navigation lives. You'll see your conversation history, workspace options, and at the very bottom of the sidebar, your profile or account section.

Click on your profile icon or account name. A dropdown or settings panel will appear. From there, look for the option labeled "Settings" or "Customize Grok" — the exact label has shifted between updates, but it should be clearly visible. Inside the Settings panel, navigate to the "Customize" section. This is where Custom Instructions lives.

You'll see two text fields. Fill in both. The first covers who you are and what context you want Grok to carry. The second defines how you want Grok to behave and respond. Once you've written your instructions, hit Save. Your changes take effect immediately in new conversations.

It's also worth noting that as of 2026, Grok Custom Instructions are also accessible directly from the model selector area in the chat interface — meaning you don't always have to dig through settings menus. If you see a settings gear icon near the model dropdown at the top of a conversation, clicking it may also give you quick access to your custom instruction panel.

Where to Find Grok Custom Instructions on iOS and Android

Grok's mobile app on both iOS and Android supports Custom Instructions, though the exact navigation path can vary slightly depending on your app version. The Grok app receives frequent updates — as recently as February 2026, updates were rolling out to both platforms — so the exact placement of menu items can shift.

Here is the general navigation path for the Grok mobile app:

Open the Grok app on your iPhone or Android device. Make sure you're running the latest version, since older versions may not have the full Custom Instructions UI. On the main chat screen, tap your profile icon — it's typically located in the top-left or top-right corner of the interface. This opens the side menu or a settings dropdown.

Look for "Settings" in the menu. Tap it. Inside Settings, you're looking for a section called "Customize Grok" or simply "Customize." On some app versions, this might also appear as "Custom Instructions" directly. Tap that option. The same two-field interface appears: what Grok should know about you, and how Grok should respond. Fill in your preferences and save.

On the iOS app, there's an additional layer of personalization worth knowing about. Voice mode on iOS supports distinct personality settings — including styles like Storyteller, Formal, and more conversational modes — which are separate from but complementary to your text-based Custom Instructions. If you use Grok's voice features regularly, exploring those persona options is worth your time.

For Android users, the core Custom Instructions feature is the same, though some companion and voice features may appear on iOS first before rolling out to Android. Keep your app updated to ensure access to the latest personalization tools.

Where to Find Grok Custom Instructions Inside the X App

If you primarily use Grok through X (formerly Twitter) rather than through grok.com or the standalone Grok app, finding Custom Instructions is slightly different — and it's worth noting that the X-embedded version of Grok has historically been a bit behind the standalone app in terms of features.

Here's how to access Grok settings inside X:

Open the X app on your device or visit x.com in your browser. Navigate to the Grok tab, which is accessible from the left sidebar on the web or from the bottom navigation bar on mobile. Once you're inside the Grok chat area within X, look below the chat input box. Earlier rollouts of Custom Instructions in the X-embedded Grok placed the feature below the query/input section — when you tapped it, a popup would appear with the two instruction fields.

On the web version of X, you may also find a small settings icon near the top corner of the Grok chat area. Tapping or clicking this should surface options including Custom Instructions. After customizing your preferences, toggle the option to apply instructions to all chats (there's typically a toggle switch at the bottom-right of the popup), then save.

Keep in mind that the X-embedded Grok experience may not have all the features available on grok.com — particularly Workspaces, Grok Studio, and extended memory features tend to be web-first. For the full Custom Instructions experience, especially if you want per-workspace instructions, use grok.com directly.

Understanding the Two Custom Instruction Fields

Now that you know where to find the feature, let's talk about how to actually fill in those two fields effectively. Most users either leave them blank or write something vague like "be helpful" — which defeats the entire purpose.

Field One: What Should Grok Know About You?

This is your professional and personal context layer. Think of this as your onboarding document for Grok. The more specific and relevant information you include here, the better Grok can tailor its responses from the very first message.

You should include your profession and industry so Grok understands the domain of most of your questions. Include your expertise level — whether you're a beginner who needs things explained simply or an expert who prefers dense, technical information without the basics.

Mention your primary use cases: are you using Grok mostly for coding, writing, research, marketing, creative projects, or business tasks? If you have ongoing projects, list them briefly so Grok can reference them when relevant.

For example, a content marketer might write: "I run a tech and gaming blog. I create SEO-optimized long-form articles targeting general audiences. I prefer plain English, avoid jargon, and always optimize for Google search intent. My primary topics are AI, gaming, smartphones, and VR."

Field Two: How Should Grok Respond?

This field is about output format and communication style. Be specific about the tone you prefer — formal, casual, conversational, or a blend. Specify whether you want responses to be concise or detailed. If you always want bullet points or always want prose, say so. If you want Grok to ask clarifying questions before writing long content, include that instruction.

Avoid vague commands like "be friendly." Instead, use concrete behavioral descriptions: "Always start with the most important point. Use short paragraphs. Avoid filler phrases. When writing articles, use H2 headings only, no H3."

The more concrete and behavioral your instructions, the more reliably Grok will follow them.

Grok Workspaces: Custom Instructions Per Project

One of Grok's most powerful features in 2026 is Workspaces — and this is where Custom Instructions get even more useful. Instead of having one global set of instructions that applies to everything, Workspaces let you have separate Custom Instructions for separate projects or contexts.

A Workspace is essentially a dedicated container for a specific use case. It can hold its own conversation history, uploaded files, and — crucially — its own set of Custom Instructions. This means your marketing workspace can have a totally different persona setup than your coding workspace or your creative writing workspace.

To access Workspaces, go to grok.com and look in the left sidebar for a "Workspaces" option. Create a new workspace for each major context or project in your life. When setting up or editing a workspace, you'll have the option to write workspace-specific Custom Instructions that override or supplement your global ones.

As of February 2026, full Workspace functionality — including per-workspace Custom Instructions — is primarily available on the grok.com web interface. Mobile support for Workspaces has been limited, so if managing multiple project contexts is important to you, use the desktop web version.

Grok Custom Instructions vs. Response Style Presets

It's worth clarifying the difference between Custom Instructions and Grok's built-in Response Style presets, because users often confuse the two.

Response Style presets are quick, pre-built options that change how Grok communicates at a surface level. Options like "Concise," "Formal," and "Socratic" are powered by hidden system-level instructions that Grok applies to your conversations. Selecting "Concise" tells Grok to keep responses brief and direct. Selecting "Formal" shifts the tone to professional and structured. The "Socratic" preset makes Grok respond with questions to guide your thinking rather than giving direct answers.

These presets are useful for quick adjustments and are accessible directly from the Settings menu under Customize. You can also set a fully custom response style — which essentially feeds your own instruction text into the response style slot.

Custom Instructions (the two-field system) operate at a deeper level. They define who you are and what persistent behavioral rules Grok follows. Think of the Response Style preset as a surface-level toggle, and Custom Instructions as the underlying behavioral layer. The two systems work together, and you can use both simultaneously to get precisely the experience you want.

Tips to Get the Most Out of Grok Custom Instructions in 2026

Writing good Custom Instructions is an iterative process. Here are practical tips that will help you get better results faster.

Start with your professional context and be specific. Generic instructions produce generic results. The more Grok knows about your actual situation, the more relevant its responses become.

Use concrete behavioral commands in the response field, not vague qualities. "Write in short paragraphs of three sentences or fewer" is better than "be concise." "Always include a summary at the end" is better than "make things clear."

Update your instructions when your projects or priorities change. Custom Instructions are not set-and-forget. Return to the settings periodically and refine them based on what's been working and what hasn't.

Test your instructions with a few prompts before committing. Paste a typical request you'd normally give Grok and see how it responds with the new instructions active. If the output still feels off, adjust the wording.

For users with multiple use cases, lean into Workspaces rather than trying to write a single Custom Instructions setup that covers everything. Compartmentalizing your contexts gives Grok cleaner signals and produces sharper outputs.

Also take advantage of Grok's data controls while you're in the Settings menu. You can disable the toggle that uses your conversations to improve the model if privacy matters to you. You can also connect Google Drive or Microsoft OneDrive for direct file access — a useful addition if your work involves a lot of document-based research.

Why Grok Custom Instructions Are a Game-Changer in 2026

The AI assistant landscape in 2026 is crowded. ChatGPT, Gemini, Claude, Copilot — every major platform now has some version of persistent personalization. But Grok's implementation stands out for a few reasons.

The combination of global Custom Instructions, per-workspace instructions, real-time web access via DeepSearch, and a 256K context window gives Grok one of the most flexible and context-aware setups available. When you write instructions that define your persona, goals, and output format, then stack those against Grok 4's reasoning capabilities and live web access, you end up with an AI that can genuinely function as a specialized assistant rather than a general-purpose chatbot.

The biggest mistake most Grok users make is treating it like a search engine — asking one-off questions and moving on. Custom Instructions shift Grok into a completely different mode: a persistent, context-aware collaborator that knows who you are, what you're building, and how you want to communicate. That's a fundamentally different tool, and it's already available in your settings right now.

If you haven't set up your Custom Instructions yet, there's no better time than today. The setup takes ten minutes. The payoff compounds across every conversation you have with Grok from here on out.

Frequently Asked Questions About Grok Custom Instructions

Can I turn off Custom Instructions temporarily without deleting them?

Yes. When the Custom Instructions popup is open (particularly in the X app version), there is a toggle switch that lets you enable or disable your instructions for all chats without clearing the text you've written. This means you can switch between your personalized mode and Grok's default behavior whenever needed.

Do Custom Instructions apply to Grok Voice mode?

Your text-based Custom Instructions do carry context into voice interactions to some degree, but voice mode also has its own personality presets on iOS. For voice-specific customization, explore the voice personality settings separately within the app.

Are Custom Instructions available on the free Grok plan?

As of 2026, the basic Custom Instructions feature (the two-field setup) is available to free users. Advanced features like Workspaces with per-project instructions and extended memory are more fully featured on paid SuperGrok plans, which start at $30 per month for unlimited Grok 4 access.

How many characters can I write in each Custom Instructions field?

xAI has not published a hard character limit for Custom Instructions as of early 2026, but keeping each field focused and under 500–600 words tends to produce more reliable adherence from the model. Overly long or contradictory instructions can cause Grok to prioritize some rules over others inconsistently.

Will Grok always follow my Custom Instructions perfectly?

Grok will make its best effort to follow your instructions across all responses. However, for responses that require more detail, clarity, or accuracy, Grok may occasionally deviate slightly to ensure it gives you correct and useful information. This is by design. Think of Custom Instructions as strong preferences, not hard constraints.

Grok Custom Instructions are one of those features that sound simple on the surface but have enormous depth once you start using them seriously. Whether you're on grok.com, the mobile app, or X, the path to finding them is short. The time you invest in writing them well pays dividends across every conversation you'll ever have with the tool. Find the setting, fill the fields, and let Grok start working for you — not the other way around.