Build an AI SOP Writer with a Custom GPT

Updated November 3, 2026. Built against the tool’s current screens and checked step by step. How we check this lesson

OpenAI is retiring custom GPTs on December 11, 2026 and replacing them with plugins. Here’s how to save yours →December 11, 2026 is the scheduled retirement date in OpenAI’s custom GPT retirement FAQ for Enterprise workspaces; OpenAI says other plans may follow the same timeline. Checked October 17, 2026. See OpenAI’s migration guide.

Custom GPTs are being retired; see ChatGPT Projects vs Gemini Gems vs Gemini Notebook: Which to Use. This lesson stays here for reference, but it is no longer in our lesson lists.

Ask plain ChatGPT to write an SOP and you get a page of filler: a purpose statement, steps like "check for any issues, as applicable", and nobody named as the owner. In this free lesson you build an AI SOP writer for Ridgeline Supply Co., a small warehouse and distribution business. It is a Custom GPT that knows the company format, roles and dock rules, and writes numbered procedures your team can actually follow.

Heads up: OpenAI is retiring Custom GPTs and moving them to plugins (December 11, 2026 for Enterprise workspaces; other plans may follow), and creating new GPTs is ending. This lesson still teaches the core skill (a role, clear rules and a reference document), and a ChatGPT Project is where to use it today.

Start here first: Get On-Brand Social Posts Every Time using a ChatGPT Custom GPT. This Operations version follows the same build with its own example business, Ridgeline Supply Co.

What you will build: an AI SOP writer for your operation

You start by asking ordinary ChatGPT one bare question: write an SOP for receiving an inbound shipment at our warehouse. The answer looks official but says almost nothing. It talks about operational excellence and relevant stakeholders. The steps are "prepare the receiving area as needed" and "store items in the appropriate location". There are no owners, no numbers, and no way for a supervisor to tell the job was done right.

Then you build a Custom GPT called SOP Writer. You give it format rules and an operations handbook, and ask the exact same question again. This time it writes SOP-REC-01: Receiving an Inbound Shipment. It has an owner, the docks it covers and how long it takes. Six numbered steps each start with a verb and name the role that does them, from chocking the trailer wheels to put-away the same shift. It ends with a check line and a plan for damaged or short freight.

Who this is for

This lesson is for operations managers, warehouse supervisors and shift leads at small and midsize businesses. You are the person who knows how the work should be done but never has time to write it down. Or you have a binder of SOPs that nobody reads because each one is three pages of filler. You do not need any AI experience. If you can copy and paste, you can do this.

What goes into the SOP rules and the operations handbook

The instructions set a strict format. Every SOP opens with a code and title, then the owner, where it applies and how long it takes. Steps are numbered, one action each, and start with a verb. The role that does the step goes in brackets. Every SOP ends with a "Check" line and an "If something goes wrong" line. Eight steps or fewer, under 200 words.

The tone rules are written for the floor. Write like a shift lead explaining the job, at a 6th-grade reading level, because many readers are new or speak English as a second language. Filler words like leverage, stakeholders, best practices and "as needed" are banned. Safety steps always come first. If a detail is missing from your notes, the GPT writes [CONFIRM] instead of guessing.

The handbook holds the facts: the roles (Operations Manager, Receiving Lead, Dock Associate, certified Forklift Operator, Shipping Lead), which docks are inbound and outbound, what the green lane, red lane and hold rack are for, and the house rules. Staged freight moves within 30 minutes, a count variance over 2% stops the job, and damage claims go in the same day. It also has a sample shift-start checklist.

Why it works

Plain ChatGPT knows nothing about your building, so it fills the gap with generic business language. A Custom GPT carries your format, your roles and your rules into every chat, so you stop re-explaining the operation each time. Because it may only use roles and areas from the handbook, it will not invent a job title or a system you do not have.

Common SOP problems this avoids

• No owner. Every step names a role, so there is no "someone should check that".
• No finish line. The check line tells a supervisor exactly what "done" looks like.
• Soft verbs. "Ensure paperwork is completed" becomes "Scan every carton against the PO in the WMS".
• Buried safety. Wheel chocks and dock plates come first, not in a footnote.
• Guessed details. Missing numbers are flagged with [CONFIRM] for you to fill in.

How to use this in your operation

Swap in your own handbook: your roles, your areas, your systems and one or two procedures you are proud of. Then paste rough notes, a voice memo transcript or an old SOP and let the GPT redraft it in your format. Ask for a checklist version too; the rules turn it into short check-box lines for a clipboard or a laminated card at the dock. It helps most when you are training new hires, preparing for a customer audit, or finally writing down the job only one person knows how to do. You still review every SOP before it goes on the wall.

Step by step: Build an AI SOP Writer with a Custom GPT

All 16 steps of the interactive module, in order. In the module you watch each one, then do it yourself in a practice copy that checks your work.

1. Ask ChatGPT

1. Click the message box. Click the message box at the bottom to start typing.

   Most people open ChatGPT and just start chatting. They type a quick prompt, get a generic answer, and wonder why AI feels underwhelming. Let's see exactly what that looks like.

2. Type a prompt. Click the Paste prompt button on the message box (or type anything close to it): Write an SOP for receiving an inbound shipment at our warehouse

   We will ask ChatGPT to write a procedure for receiving a shipment. No context, no instructions, just a bare prompt — the way most people use it.

3. Send the message. Click Send.

2. Explore GPTs

4. Open the More menu. Read the response — it is vague and full of filler. Now click More in the sidebar.

   Look at that. Filler everywhere, words like stakeholders and operational excellence, and steps like check for any issues. No owners, no numbers, no way to tell when the job is done. Nobody on the dock could follow that. That is what happens when you give AI zero context. Let's fix that.

5. Open GPTs. Click GPTs to explore Custom GPTs. In the current ChatGPT the sidebar says Explore and there is no More menu, so you can also go straight to chatgpt.com/gpts.

   A Custom GPT is your own version of ChatGPT with built-in instructions and knowledge. Instead of explaining who you are every time you chat, the GPT already knows. In the current ChatGPT that button is called Explore, or you can go straight to chatgpt dot com slash gpts.

6. Create a GPT. Click + Create to start building your Custom GPT.

   This is the GPT store. You can browse what others have built, but we are going to create our own.

3. Name your GPT

7. Click the Name field. In the real builder you start on the Create tab, which is a chat. Click the Configure tab first, then click the Name field.

   This is the GPT builder. On the left you configure it, on the right you can preview it. First, give it a name. In the real builder you start on the Create tab, which is a chat, so click the Configure tab first.

8. Name your GPT. Enter the name: “SOP Writer”

   Call it SOP Writer. This is what shows up when you open it later.

4. Add instructions

9. Click the Instructions field. Click the Instructions field.

   Now here is the important part. The instructions tell the GPT exactly how to write, what format to use, what words to avoid, and how to lay out every procedure.

10. Paste your instructions. Paste in the instructions to add your SOP rules.

    These instructions cover the format, who owns each step, how to write a check, and how the warehouse actually runs. This is what turns a generic chatbot into a tool that writes procedures your team can follow.

    You are the SOP writer for Ridgeline Supply Co., a small warehouse and distribution business. You turn a manager's rough notes into clear standard operating procedures (SOPs) and checklists that anyone on the floor can follow.
    
    FORMAT
    - Start with the SOP code and title, for example "SOP-REC-01: Receiving an Inbound Shipment".
    - On the next line: Owner, where it applies, and how long it takes.
    - Then numbered steps. One action per step. Start every step with a verb.
    - Put the role that does each step in brackets at the end, for example (Dock Associate).
    - End with a "Check" line: how a supervisor can tell the job was done right.
    - Add an "If something goes wrong" line for the most common problem.
    - Keep every SOP to 8 steps or fewer and under 200 words.
    
    VOICE & TONE
    - Write like a shift lead explaining the job on the floor. Plain words, short sentences.
    - Write at a 6th-grade reading level. Many readers are new or speak English as a second language.
    - Never use filler words: leverage, synergy, stakeholders, best practices, streamline, as applicable, as needed.
    - Never use emojis.
    
    CONTENT RULES
    - Only use roles, areas and systems from the Operations Handbook. Never invent a role or a tool.
    - Use real numbers: minutes, counts, percentages, lane colors, dock numbers.
    - If the notes are missing a detail, write [CONFIRM] in its place. Never guess.
    - Safety steps (forklift, lifting, ladders) always come first and are never optional.
    - When asked for a checklist, use check boxes instead of numbers and keep each line under 10 words.
    
    COMPANY CONTEXT
    - Ridgeline Supply Co. has 22 people, one warehouse, 4 dock doors and 2 shifts.
    - We ship packaging and janitorial supplies to local businesses.
    - Every pallet gets a license plate label and is tracked in our WMS.

5. Upload knowledge

11. Upload your operations handbook. Click Upload files to find your operations handbook.

    Instructions set the rules. You can also upload files — your operations handbook, your roles, sample checklists. The GPT uses them as reference.

12. Open the operations handbook. Click Ridgeline-Operations-Handbook.pdf to preview it.

    Here is your Google Drive. Find the operations handbook and click it to see what is inside.

13. Attach the document. Scroll through the document, then click Select to attach it.

    This is your operations handbook: the SOP format, the roles, the dock areas, the rules, and a sample checklist. The GPT will write every procedure to match it.

6. Test your GPT

14. Start chatting. Click the message box in the preview panel to test your GPT.

    Everything is set. We have a name, detailed instructions, and our operations handbook uploaded. Now let's test it with the exact same prompt we used before.

15. Type the same prompt. Enter the same prompt: “Write an SOP for receiving an inbound shipment at our warehouse”

    Same exact prompt. Word for word. The only difference is that this GPT has our instructions and operations handbook.

16. Send the message. Click Send.

    Send it and watch the difference.

Screenshots

Frequently asked questions

Is there a ChatGPT SOP generator?

You do not need separate software. ChatGPT works as an SOP generator once it knows your format, roles and rules, which is what this lesson sets up: paste rough notes and it returns a numbered procedure with an owner for every step. Custom GPTs are being retired, so keep the same instructions in a ChatGPT Project. For a prompt-only version, see how to write an SOP with ChatGPT.

Can ChatGPT write SOPs in my company format?

Yes, if you give it the format. In this lesson the Custom GPT gets written format rules plus an operations handbook, and it writes every SOP with a code, an owner, numbered steps, roles and a check line. You should still review each one before using it.

Is this lesson free?

Yes, Stepthrough is completely free. To build it for real you need your own ChatGPT account. OpenAI is retiring Custom GPTs (December 11, 2026 for Enterprise workspaces; other plans may follow) and creating new ones is ending, so put the same instructions and document in a ChatGPT Project instead. Check OpenAI's current plans.

Can it write checklists as well as SOPs?

Yes. The instructions tell it to use check boxes instead of numbers when you ask for a checklist, and to keep each line under 10 words.

Do I need to know anything about AI to follow along?

No. The lesson is 16 short steps and about 8 minutes. The long instructions and the handbook are pasted or attached for you.

How does the interactive lesson work?

Each step is shown to you first on the left (Watch). Then you do it yourself in a practice copy on the right (Your turn), and every click is checked. If you get stuck, press Do it for me. It is a practice copy, so no real accounts are touched.

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