Google Gemini launches Interactions API: Reconstructing intelligent agents to end "phantom bills".

According to Beating's monitoring, Google has officially made the Interactions API the default interface in the Gemini API and Google AI Studio, while the original interface generateContent has entered maintenance. The new interface will package multi-turn dialogues, model thinking, tool calls, and execution results into a unified package and store them as Interaction resources on the server side. The most direct benefit is cost-effectiveness and labor-saving. Since the server automatically saves the dialogue state, during multi-turn chats, the client only needs to send the interaction ID of the previous step, and Google can automatically reuse it and improve the cache hit rate, significantly reducing token fees. For time-consuming tasks such as code sandbox running or deep search, developers can enable background mode to allow the work to run asynchronously in the background. In addition, intermediate steps such as model thinking and tool calls are fully visible, making it easy to troubleshoot bugs in the operation of intelligent agents in real time. The underlying refactoring directly solved the billing crisis that broke out in early June. At that time, after manually deleting the cache, due to cloud synchronization delays, the cancelled resources were still running in the background, resulting in some accounts being abnormally deducted nearly 27,000 RMB within 12 hours. Additionally, the model is prone to getting stuck in a thought loop during online searches, still charging the full amount of 64,000 tokens even in a "zero output" state with no responses. The Interactions API replaces manual deletion with a server-hosted "implicit cache" and allows developers to monitor and halt the thought process, providing a more secure billing defense. Since Google's future cutting-edge models and agent features (such as Deep Research) will only support the Interactions API, developers are officially advised to complete the adaptation as soon as possible.