Google Makes Interactions API The Default Way to Build with Gemini Agents
Google is changing how you build with Gemini.
The Interactions API is now generally available. It is now the primary way to work with Gemini models and agents.
This is a major shift for developers. Google is moving toward an agent-first approach. While the old generateContent API still works, new agent features will land on the Interactions API first.
Key features of the Interactions API:
• One endpoint for everything. Use a model ID for simple tasks or an agent ID for long tasks. • Managed Agents. One API call sets up a Linux sandbox. The agent can run code, browse the web, and manage files. • Background tasks. Set background=True to run long tasks without waiting. • Tool mixing. Combine Google Search and Google Maps with your own functions in one request. • Deep Research. Get better speed and depth with native charts and multimodal support for images and PDFs. • Media generation. Access image, music, and text-to-speech tools. • Cost controls. Use Flex or Priority tiers. The Flex tier offers 50% lower costs. • State retention. Paid users can access past interactions for 55 days.
The architecture is also changing. Google is moving away from old message formats. Each step is now a typed action like user input, thought, or function call.
What should you do?
If you start a new Gemini project, use the Interactions API.
If you have an existing app, keep it running. But audit your workflows. See if you need background execution or managed agents.
Check your SDKs. Google supports partners like LiteLLM, Eigent, and Agno.
Watch your costs. Test the Flex tier for workloads where speed matters less than price.
Note that Managed Agents run on Google side. Review sandbox behavior and data controls if you handle sensitive data.
Google is not turning off the old API. They are showing you the future. If you build on the old path, you might miss the best new features.
Optional learning community: https://t.me/GyaanSetuAi