OpenAI Moves Custom GPTs to Plugins.

This is platform consolidation with a real migration tax: Plugins offer a broader workflow model, but developers cannot assume their GPTs will behave identically after conversion.

• –Instructions and knowledge files migrate into skills, while custom actions must be rebuilt through supported connectors or MCP servers.
• –Selected models, capability settings, conversation starters, and sharing permissions may not carry over cleanly.
• –Teams should preserve regression prompts, assign migration owners, and test both explicit and automatic plugin selection.
• –Early developer feedback suggests simple instruction edits can become versioning and publishing workflows, creating friction for nontechnical GPT builders.