What is Gemini 3.5?

At Google I/O 2026 on May 19, 2026, Google officially unveiled Gemini 3.5 — a major update to its Gemini model family. The new model features 1.2 trillion parameters and achieves performance comparable to OpenAI GPT-5.5 .

Key Features

  • 1.2 Trillion Parameters: Massive scale for complex reasoning and agent tasks
  • GPT-5.5 Competitive: Performance matching OpenAI latest model
  • Breakthrough Agent Tasks: Significant improvements in agent capabilities
  • Enhanced Long Context: Advanced long-context processing
  • On-Device Optimization: Lightweight performance for low-to-mid range devices
  • Deep Android Integration: Tighter integration with Android ecosystem

Official Announcement

Announced during Google I/O 2026 keynote on May 19, 2026. Available now to developers via API and Google AI Studio.

Pricing

Available through existing Gemini API pricing tiers. Free tier available for limited usage.

Pros

  • 1.2T parameters — massive scale
  • GPT-5.5 competitive performance
  • Breakthrough agent task capabilities
  • On-device optimization available
  • Deep Android ecosystem integration

Cons

  • Large model requires significant compute
  • May be overkill for simple tasks
  • API pricing adds up for heavy use
  • Some features Android-only

Who Should Use It?

Perfect for: Developers building agent applications, enterprises needing large-scale LLM capabilities, and Android users wanting integrated AI.

Verdict

Gemini 3.5 represents Google most capable model to date. The focus on agent tasks (rather than just reasoning) positions it well for the emerging agent economy .

Rating: 4.5/5 - Google most powerful model yet.