During OpenAI’s DevDay in San Francisco (october 2025), the AgentKit platform was announced to help developers build custom agents. Google already offers a similar platform, Vertex AI Agent Builder, and Microsoft has its own Copilot Studio. Agent Builder is the main module of the AgentKit platform. It is designed to control the behavior of ChatGPT models much more precisely than is possible with standard prompts or custom GPTs. Agents have existed for a long time, including those using ChatGPT models, but most often they were created through third-party intermediary platforms. Now, OpenAI allows you to build custom agents on its models without intermediaries.
Dmitry Baraishuk
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7
min read
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