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Claude Projects vs Custom GPTs

Claude Projects vs ChatGPT Custom GPTs compared: persistent context, file uploads, sharing, agents, and which fits your workflow.

Updated May 2026 · 7 min read
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Both Anthropic and OpenAI ship a way to package context + instructions + uploaded files into a reusable assistant. Anthropic calls it Claude Projects; OpenAI calls them Custom GPTs (or GPTs). They look similar but trade off differently — Custom GPTs are public-by-default and have a marketplace; Claude Projects are private, more security-aware, and integrate with Claude Code.

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Option 1

Claude Projects (Pro/Team)

Persistent context + files for ongoing work, private by default.

Best for

Personal workflows, internal team knowledge, code-heavy projects.

Pros

  • Persistent context across all conversations in the project.
  • File uploads with automatic context injection.
  • 1M token context window.
  • Tight integration with Claude Code.
  • Private by default; sharing is opt-in within Team.

Cons

  • No public marketplace / discovery.
  • No third-party actions / plugins like Custom GPTs.
  • No published-to-the-internet usage.

Option 2

Custom GPTs (ChatGPT Plus+)

Pre-baked instructions + files + actions, marketplace publishing.

Best for

Public-facing AI tools, plug-in builders, anyone who wants discovery + traffic.

Pros

  • Public marketplace — your GPT can be discovered.
  • Custom Actions API for third-party integration.
  • Memory across sessions.
  • Familiar share-link UX.
  • Generous free tier for users to try them.

Cons

  • Less private — published GPTs are visible.
  • Memory leakage between unrelated GPTs.
  • Smaller usable file context vs Projects.
  • GPT-5 quality is excellent but trails Claude on agent tasks.

The verdict

Use Claude Projects for private, ongoing work — research projects, ongoing code refactors, internal knowledge. Use Custom GPTs when you want a discoverable, public AI tool or need third-party API actions. The two address different needs and aren't really substitutable.

Run the numbers yourself

Plug your own inputs into the free tools below — no signup, works in your browser, nothing sent to a server.

Free toolAI Feature Comparison MatrixVision, audio, video, tool use, web search, code interpreter, file upload, voice mode, memory, agents — across ChatGPT, Claude, Gemini, Perplexity, and 6 more.Open tool →Free toolFrontier AI Model TrackerLive tracker of every frontier AI model: Claude 4.x, GPT-5, Gemini 3 Pro, DeepSeek R1/V3.2, Kimi K2, Grok 4, Llama 4, Qwen 3.5, Mistral Large 3.Open tool →

Frequently asked questions

Can I publish a Claude Project publicly?

Not yet at a marketplace level. Sharing is limited to inside a Team workspace. Custom GPTs are the right pick if public discovery matters.

Which has bigger context window?

Claude Projects (1M tokens via Sonnet 4.6). Custom GPTs use GPT-5's 400k context — meaningfully smaller for whole-codebase or whole-book ingestion.

Can Custom GPTs run code or call APIs?

Yes — Custom GPTs support Code Interpreter (now Advanced Data Analysis) and custom Actions for third-party APIs. Claude Projects don't have a direct equivalent in 2026 Q1.

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