Originally published on rohitraj.tech
Google made the Gemini Interactions API generally available in 2026 and quietly made it the default interface for Gemini models and agents. The core method is interactions.create, and it keeps conversation state server-side via previous_interaction_id instead of resending the full history every turn like generateContent. This is the builder\'s migration read: the actual code diff from generate_content to interactions.create, the interaction-scoped-tools footgun the docs bury, a side-by-side against generateContent and OpenAI\'s Responses API, an honest "when to stay on generateContent," and exactly how I\'d wire it into production with a fallback and a store=false privacy path.
Read the full version with code samples, diagrams, and architecture details: Gemini Interactions API: The Migration Guide from generateContent (2026)
More engineering notes: rohitraj.tech/en/notes
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