Gemini Interactions API (ai.google.dev)

Google has announced the Gemini Interactions API, now Generally Available as of June 2026, which serves as the primary interface for developers working with Gemini models and agents. This new API introduces features such as optional server-side conversation state management and observability for debugging, greatly enhancing the usability and cost-efficiency of multi-turn conversations. The Interactions API allows seamless integration of various models and agents through a single unified interface, encouraging the development of complex agentic applications with capabilities for both simple tasks and sophisticated reasoning. The introduction of this API is significant for the AI/ML community as it streamlines the development process, significantly lowers token costs by improving context caching, and reduces the complexity of state management during interactions. With features like the previous_interaction_id for conversation continuity, developers can maintain context without resending entire histories. The API also provides extensive support for various Gemini models, ensuring that future advancements and capabilities will be launched directly within this framework. As a result, developers can quickly adapt and optimize their applications while taking advantage of the latest tools offered by Gemini.