Both Anthropic and OpenAI have built ways for businesses to create customized, persistent AI assistants for specific tasks — without hiring developers or building custom software.
Claude Projects and ChatGPT Custom GPTs serve similar goals but are meaningfully different in design. Here’s the comparison that helps you decide which fits your team’s workflow.
Claude Projects: what it is and what it does
Claude Projects (available on Claude Pro, $20/month; Claude Team, $25/seat/month) is a persistent workspace system where you configure Claude for a specific context and maintain that context across all conversations in the project.
What you configure:
- Custom instructions: How Claude should behave, what its role is, what format to use, what to avoid
- Uploaded documents: Company policies, product specs, brand guidelines, past examples, reference material
- Project context: The cumulative conversation history within the project remains accessible
What this means practically:
You create a “Proposal Writing” project. You upload your proposal template, three example proposals, your pricing guide, and instructions for tone and structure. Every time you open that project to work on a proposal, Claude already knows your format, your pricing, and your style. You describe the client situation — Claude writes within your established framework.
You don’t re-explain “we charge $X for Y” in every conversation. The project knows.
Strengths of Claude Projects:
- Long document handling (Claude’s 200K token context excels here)
- Instruction-following consistency across the project
- No limit on the number of projects
- Clean, focused interface for knowledge-intensive work
Limitations:
- Not shareable to other users without Claude Team plan
- No native “actions” — Claude can’t call external APIs or query live data within Projects
- Less distributable than Custom GPTs (can’t publish to a store)
ChatGPT Custom GPTs: what they are and what they do
Custom GPTs (available on ChatGPT Plus, $20/month) let you create specialized versions of ChatGPT with custom instructions, uploaded knowledge files, and optionally, Actions — API connections that make the GPT capable of retrieving live data or triggering external processes.
What you configure:
- Instructions: How the GPT should behave, its persona, what it focuses on
- Knowledge files: PDFs, documents, spreadsheets that the GPT can reference
- Actions: OpenAPI schema connections to external APIs — the GPT can call your CRM, inventory system, or any web API
What this means practically for Actions:
A customer support Custom GPT with Actions can look up a customer’s order status in real time during the conversation. Not from uploaded documents — from your live Shopify or WooCommerce order data. A sales Custom GPT with Actions can check product availability, retrieve current pricing, or create a CRM record — all from within the chat interface.
Strengths of Custom GPTs:
- Shareable with a link to any ChatGPT Plus user
- Actions enable live data access — the most powerful differentiator
- GPT Store distribution option (publish publicly)
- Team management available for sharing within organizations
Limitations:
- Knowledge file handling less robust than Claude’s for very long documents
- Actions require API setup — not truly no-code for advanced configurations
- GPT quality ceiling somewhat below Claude’s for complex writing and analysis
Direct comparison
| Feature | Claude Projects | ChatGPT Custom GPTs |
|---|---|---|
| Persistent instructions | ✅ | ✅ |
| Document knowledge upload | ✅ Excellent | ✅ Good |
| Long document handling | ✅ Superior (200K context) | ✅ Strong (128K context) |
| Instruction-following quality | ✅ Superior | ✅ Strong |
| Shareable with others | ⚠️ Team plan required | ✅ Link share |
| Live data via API (Actions) | ❌ | ✅ |
| Publishing to store | ❌ | ✅ GPT Store |
| Writing quality for complex tasks | ✅ Slightly better | ✅ Strong |
| Monthly cost | $20 (Pro) / $25/seat (Team) | $20 (Plus) / $30/seat (Team) |
The decision: which use case fits which tool?
Choose Claude Projects for:
- Knowledge workers doing intensive document-based work (proposals, contracts, reports, analysis)
- Brand-consistent content creation where voice and style instructions need to hold across many conversations
- Research and analysis tasks where long document context matters
- Individual use or team use where everyone has their own Claude subscription
Choose Custom GPTs for:
- Tools that need to be distributed to team members or clients via a link
- Customer-facing or support contexts where live data retrieval is important
- Any use case where the AI needs to query or update an external system (CRM lookup, inventory check, order status)
- Organizations that want to build a library of specialized GPTs for different roles
Use both when:
- You have different types of workflows: Claude Projects for knowledge-intensive internal work, Custom GPTs for distributable tools and live-data use cases
- The $40/month combined cost ($20 each) is acceptable for the combined capability
Practical examples for small businesses
Claude Projects setup: “Client Proposal Assistant” Upload: proposal template, 3 past proposals, pricing guide, service descriptions, brand voice guide. Instructions: “Write proposals in our specific format. Always reference pricing from the guide. Match the tone of the examples.” Use: Every new proposal starts from the same knowledge base. Draft in 10 minutes vs. 2 hours.
Custom GPT setup: “Order Status Bot” Instructions: “You help customers check their order status. Always start by asking for their email address.” Actions: Connect to Shopify API to retrieve order data in real time. Use: Team members or customers can check order status from a link — no developer required for the interface.
For related reading, see our comparison of ChatGPT vs Claude for Business and our guide on How to Write AI Prompts That Actually Work for Business.
Book a free automation audit and we’ll design the right AI workspace configuration for your team — Projects, Custom GPTs, or both — based on your actual workflow and distribution needs.