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Google ADK (Agent Development Kit) is Google's open-source framework for building, evaluating and deploying AI agents. It is code-first, works with Gemini and other models via LiteLLM, and offers workflow agents, tools and memory. Version 2.5.0 landed in July 2026 and deploys straight to Vertex AI.
Gemini 2.5 Pro reached preview on 25 March 2025 and general availability at the end of June, alongside the cheaper, faster Gemini 2.5 Flash. Two things separate it from Gemini 2.0: a one-million-token context window that behaves stably to at least 500k, and multimodality that has left the demo stage behind.
Google released Gemma 2 in mid-2024, and it has since seen real production use. A look at how it competes in the open-model ecosystem, which sizes actually make sense, and where its adoption has settled in.
Gemini 2.0, announced by Google in December, puts tool use and agent behavior at the center of the product: it is designed to execute actions, not only generate text. Its clearest advantages are Flash's one-million-token context window, cheap input tokens, and first-class access to Search, Maps, Cloud, and Workspace. Claude 3.5 Sonnet still leads on complex reasoning.
Gemini 1.5 Pro launched in February 2024 with a verified one-million-token context window. It retrieves over 95% of data up to 530,000 tokens in recall tests, reshaping RAG system design, making full-document analysis viable, and enabling new architectural patterns through context caching.
