Google I/O 2026: Google Introduces Gemini 3.5, built for complex agentic workflows

At the Google I/O 2026 event on Tuesday, Google unveiled Gemini 3.5, its latest family of models that combines frontier intelligence with action. This marks a major leap forward in building more capable, intelligent agents. Google announced that it is kicking off the series with the new Gemini 3.5 Flash, which delivers frontier performance for agents and coding, excelling at long-horizon tasks and offering real-world utility.

Gemini 3.5 Flash: Frontier performance for agents

The new model offers intelligence that can rival large flagship models across multiple dimensions, while maintaining the speed expected from the Flash series. Google describes it as its strongest agentic and coding model yet, delivering frontier-level intelligence at exceptional speed—removing the need to trade quality for latency.

Gemini 3.5 Flash: Agentic tasks at scale

Google highlighted the model’s ability to handle long-horizon agentic tasks that previously took days or even weeks. These challenges can now be completed in seconds, often at around half the cost of other frontier models. It rapidly plans, builds, and iterates to solve real-world problems, whether developing applications, maintaining codebases, or assisting with financial documentation.

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Combined with the updated Antigravity framework, Gemini 3.5 becomes a powerful engine for executing collaborative sub-agents that tackle complex problems at scale. Under supervision, it can reliably execute multi-step workflows and coding tasks while maintaining frontier-level performance.

Personal AI agents powered by Gemini 3.5

Gemini 3.5 Flash is now the default model for the Gemini app and AI Mode in Search globally, as announced at Google I/O. The new Gemini Spark uses Gemini 3.5 Flash and operates continuously, helping users manage their digital lives and take actions on their behalf under their direction. It has been rolled out to trusted testers, with a beta version coming to Google AI Ultra subscribers in the US next week.

Gemini 3.5 has been developed in accordance with Google’s Frontier Safety Framework. Google has strengthened its cyber and CBRN safeguards, reducing the likelihood of harmful content generation. Gemini 3.5 Flash is generally available via Google Antigravity, the Gemini API in Google AI Studio and Android Studio, as well as Gemini Enterprise Agent and Gemini Enterprise.