The shared layer is MCP

ChatGPT apps and Claude connectors can both be backed by MCP servers. The server exposes tools and data; the host decides how those capabilities appear to the user.

That means builders should separate the core server contract from the product surface. One product can support multiple hosts if the auth, tools, and user experience fit each host's rules.

When ChatGPT apps are a strong fit

ChatGPT apps are useful when the workflow benefits from a visible app experience inside ChatGPT. That can include previews, selection UI, editing surfaces, commerce flows, or structured outputs users need to inspect.

  • Use ChatGPT apps for visual, consumer, productivity, design, shopping, and guided workflows.
  • Add UI when users need to compare options, edit results, or confirm a choice.
  • Optimize app metadata and examples so ChatGPT can call the app at the right moment.

When Claude connectors are a strong fit

Claude connectors are useful when users want Claude to reach external tools, data, or work systems while staying in a conversational or agentic workflow.

  • Use Claude connectors for files, databases, project systems, internal tools, coding agents, and research workflows.
  • Make permissions clear, especially for write actions or sensitive data.
  • Check whether the workflow belongs in Claude chat, Claude Code, or an API-based assistant.

How to decide

Choose the host your users already trust for the job. If the workflow needs visual review or a consumer-facing app surface, start with ChatGPT. If it needs deep workspace context, code workflows, or internal data access, evaluate Claude connectors as well.