After three years with ChatGPT, I switched to Claude. ‘What about losing all your context?’ Truth is, you’re not losing context—you’re losing baggage. Here’s how to switch without losing what actually matters.
“But I’ll lose three years of context!”
No, you won’t lose your context, you’ll lose your baggage. If you’re conscious about the move and follow the steps in this guide, you’ll end up identifying everything that’s valuable and ditching the clutter.
Starting fresh is actually a feature.
After three years with ChatGPT, I had accumulated tons of “context” – custom instructions, saved prompts, conversation history stretching back to 2022. It felt like valuable knowledge. It wasn’t. It was more of a context debt, than context value. Because what I ended up doing recently after years of experimentation is basically giving context to every new conversation through pre-defined documents, using Projects and custom GPTs.
A fresh start forces you to be intentional. You only bring over what you’re actively using. You don’t drag along every experiment, every abandoned idea, every outdated preference. Think of it like moving apartments – you don’t pack everything from the old place, just what still serves you.
How to Switch from Claude to ChatGPT? Step-by-Step.
Step 1: Export Your ChatGPT History (Just in Case)
Start by creating a safety net. Even though you won’t need most of this, it’s good to have a backup.
- Go to ChatGPT Settings → Data Controls → Export data
- You’ll receive a download link (usually within a few hours)
- Download the ZIP file – it contains all your conversations in JSON format
- Keep it somewhere safe as a backup
Now here’s what you actually need to extract from this export:
- Notes from ongoing projects
- Important decisions or conclusions you’ve documented
- Prompts you created that you use regularly
Don’t try to preserve everything. Most conversations are historical artifacts – you learned from them already, you don’t need to carry them forward.
Step 2: Save Your Custom Instructions and Best Prompts
This is the part that actually matters. Your custom instructions and go-to prompts represent real accumulated value.
- Go to ChatGPT Settings → Personalization
- Copy your Custom Instructions (both “What would you like ChatGPT to know about you?” and “How would you like ChatGPT to respond?”)
- Go through your recent conversations and grab your most-used prompts
- Save these in a Google Doc or any text editor
- Optional but recommended: Download this as a Markdown file (.md)
What’s Markdown?
Markdown (.md) is a simple text formatting language that uses plain text with basic symbols like # for headers and * for bullets. It’s readable as plain text but can be formatted beautifully by apps like Claude.
If you’re not sure how to save a file as .md, just ask Claude! Upload your text file and say “convert this to Markdown format” – Claude will format it properly and you can download it as a .md file.
Why Markdown?
Because Claude can read .md files beautifully, and you can reference them whenever you need that context. More on this in a moment.
Step 3: Replace Custom GPTs with Claude Skills (Or Don’t)
If you’ve built custom GPTs, you have two options for replicating them in Claude.
The short version:
- Personal custom GPTs → Migrate to Claude Skills or Projects
- Public custom GPTs in the GPT Store obviously
How to migrate:
Your custom GPT instructions can become Claude Skills (reusable across all conversations) or Projects (persistent context for ongoing work). Skills work when you need the same framework repeatedly. Projects work when you’re building context over time on specific work.
The basic process:
- Copy your custom GPT instructions from ChatGPT
- Save as a .md file (Google Docs: File → Download → Markdown)
- Upload to Claude Skills (Settings → Capabilities → Skills → Add)
- Reference by name when you need it
For the full migration guide with step-by-step instructions and real examples, see: How to Migrate Your Custom GPTs to Claude
What you should know:
- Most personal custom GPTs migrate easily—they’re just instructions and optional files
- The functionality translates well
- Public custom GPTs you’ve published stay in ChatGPT, but are deactivated if you move to a free subscription
- If your custom GPTs serve as lead magnets or trust-building assets, keeping both subscriptions makes sense
Simple alternative: For occasional use, you don’t need Skills at all. Just save your instructions as a text file, upload when needed, and say “Use these criteria to evaluate this article.”
Don’t overcomplicate it. Start with one custom GPT migration and see how it feels.
Step 4: Set Up Claude with Your Preferences
Now it’s time to actually set up Claude. Get a Claude Pro subscription ($20/month).
Claude has a memory feature that’s different from ChatGPT’s scattered context. It’s intentional and editable.
- Go to Settings → Personalization → Memory
- Tell Claude about your writing style, your projects, your preferences
Unlike ChatGPT’s accumulated context, Claude’s memory is something you control. You can see what Claude remembers, edit it, or delete it. It’s cleaner.
Step 5: Transfer Active Projects Only
Here’s where discipline pays off. Don’t try to recreate everything from ChatGPT.
For ongoing work:
- Copy relevant conversation excerpts into new Claude chats
- Focus on conclusions and decisions, not entire conversation histories
- If you need context, paste the essential parts at the start of a conversation
For research:
- Bring over your notes as documents
- Don’t try to preserve entire research conversations
- The insights matter, not the path you took to get there
Be ruthlessly selective. If you haven’t touched something in months, you probably don’t need it.
Step 6: For Power Users – The .md File Strategy
This is where things get interesting, especially if you’re a power user who works with Claude regularly.
Save your custom instructions, style guides, and reference materials as Markdown (.md) files. Then you have two ways to use them:
Method 1: Upload When Needed
Simply drag and drop your .md files into Claude at the start of a conversation, then reference them: “Read my-style-guide.md first, then write this blog post.”
Method 2: Use Cowork (Advanced)
If you want Claude to have persistent access to your files:
- Download the Claude desktop app from claude.ai/download
- Open Claude and click “Cowork” in the left sidebar
- Select a folder on your computer where you keep your reference files
- Now Claude can access these files whenever you mention them
Cowork is optional – most people don’t need it. But if you’re constantly referencing style guides, brand guidelines, or technical documentation, it’s incredibly useful.
Example .md files you might create:
- writing-style.md – Your personal writing preferences
- brand-guidelines.md – Company voice and terminology
- custom-prompts.md – Your favorite prompts for specific tasks
- project-context.md – Background on active projects
Start your prompts with “Read [filename].md first” and Claude will incorporate that context into its responses.
What You’ll Actually Miss from ChatGPT?
Let’s be honest about what you’re giving up:
Custom GPTs: Replaced by Skills or simple file uploads. In many cases, the Skills approach is actually better because it’s more flexible. But the big advantage of custom GPTs is that you can share them publicly and use them as lead magnets or trust-building assets. If this works well for you, keeping your ChatGPT subscription makes sense. That’s my case.
Conversation history: Most of it was noise. The most valuable thing you’ve gained from ChatGPT is the skill of prompting – how to give feedback, how to iterate toward what you want. That’s in your head, not in the conversation history.
What I Still Open ChatGPT For?
I haven’t completely abandoned ChatGPT. I’m not a zealot about this. Here’s what I still use it for:
Personal Custom GPTs: I have a few custom GPTs I built that I haven’t fully migrated yet. It’s mostly habit – I know where they are, I know how they work. I might migrate them eventually, but there’s no rush.
Public Custom GPTs: I’m a big fan of these. They act as lead-magnets, trust-building assets. I often build them for customers, who keep using them after our engagement is over. Some of them are for public use.
Deep Research mode: ChatGPT’s Deep Research feature is genuinely good for certain types of comprehensive research.
But here’s what’s changed: I’ve moved all my writing to Claude. It just writes better. More natural, more thoughtful, more human.
Frequently Asked Questions
Q: What data should I save from ChatGPT before switching and how?
A: Focus on three things: (1) Custom instructions from Settings → Personalization, (2) Your most-used prompts from recent conversations, and (3) Any ongoing project notes or conclusions. Save these as Markdown (.md) files – just paste them into a text editor and save with a .md extension. Don’t try to preserve entire conversation histories; extract only the insights and decisions that matter. You can also export all your ChatGPT data from Settings → Data Controls as a backup, though you likely won’t need most of it.
Q: How long does it take to fully switch from ChatGPT to Claude?
A: The initial setup takes about 30-60 minutes: exporting your ChatGPT data, saving your custom instructions as .md files, and setting up Claude Pro with your preferences. The mental adjustment takes 3-5 days of regular use. Most people report feeling comfortable with Claude within a week.
Q: What happens to my ChatGPT custom GPTs when I switch to Claude?
A: Custom GPTs stay in your ChatGPT account even if you cancel Plus. You can recreate them in Claude using Skills (for recurring workflows) or by saving your instructions as .md files and uploading them when needed. If your custom GPTs are public and serve as lead magnets, consider keeping both subscriptions.
Q: What happens to the public custom GPTs people are using after I cancel ChatGPT Plus?
A: Your public custom GPTs remain accessible to everyone even after you cancel Plus. They continue working normally – people can still find and use them. You just won’t be able to edit or create new custom GPTs without an active subscription. So if you have popular public GPTs serving as lead magnets, they’ll keep working for your audience.
Q: Do I need Claude Cowork?
A: No, most users don’t need it. Cowork is a desktop app feature that gives Claude persistent access to specific folders on your computer. It’s useful if you constantly reference style guides, brand guidelines, or technical documentation. For everyone else, the web version at claude.ai works perfectly – just upload files when you need them. Start with the web version and only explore Cowork if you find yourself repeatedly uploading the same reference files.
Originally posted here
