There are four broad paths. Which fits depends on whether you need public sharing, Actions, or team access.
1. OpenAI plugins
OpenAI's stated direction. Best if your users stay in ChatGPT. See the checklist.
2. Project-style workspaces
Several assistants offer project spaces with instructions and files. Good for internal use; see moving a GPT to a Claude Project.
3. Third-party bot builders
Hosted platforms let you build a bot with instructions, files and an embeddable chat. Compare pricing and data handling yourself before choosing. We have no affiliate relationships on this site.
4. Custom build
An API-based bot gives you full control and stable behavior. That is what our audit scopes for complex GPTs.