OpenAI documents Custom Actions for GPTs so a GPT can call external HTTP APIs via an OpenAPI schema, enabling tool-style integrations from ChatGPT into third-party systems when configured by the builder.
AI Integration Intelligence
OpenAI Custom Actions (GPTs)
OpenAI · agent-tools
All AI Integrations → · Official docs →
Editorial overview
How it works
- Builders attach an OpenAPI schema defining endpoints
- ChatGPT invokes actions when the model decides a tool call is needed
- Authentication options are documented in OpenAI’s GPT actions guides
Limitations
- Availability depends on ChatGPT product tier and GPT builder features
- Action reliability depends on the external API’s uptime and schema quality
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Why it matters
OpenAI Custom Actions (GPTs) is tracked so teams can evaluate how AI surfaces connect to apps, data, and workflows using official documentation—not marketing claims.
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