What is Gemini 3.5 Pro?

At Google I/O 2026 on May 19, 2026, Google announced that Gemini 3.5 Pro — the larger, more capable version of Gemini 3.5 — is planned for release in June 2026. The model is currently in internal use at Google .

Gemini 3.5 Pro will offer higher performance than the already-released Gemini 3.5 Flash, which is optimized for speed and cost-efficiency for agent tasks.

Expected Capabilities

  • Higher Performance: Superior to Gemini 3.5 Flash on complex reasoning
  • Larger Parameter Count: Significantly larger than Flash variant
  • Agent-Optimized: Like Flash, designed for agent tasks
  • Long Context: Extended context window for complex workflows
  • Multimodal: Text, image, audio, video understanding

Current Status

  • In internal use at Google
  • Planned for external release in June 2026
  • Available via Antigravity, Google AI Studio, and Gemini API

Pricing

Not yet announced — expected to be higher than Gemini 3.5 Flash pricing.

Pros

  • Higher capability than Gemini 3.5 Flash
  • Google internal testing suggests readiness
  • Same API as other Gemini models
  • Designed for complex agent tasks
  • Release date relatively soon (June 2026)

Cons

  • Not yet released (planned June 2026)
  • Pricing not announced
  • Performance benchmarks not yet public
  • May be more expensive than Flash

Who Should Use It?

Perfect for: Developers and enterprises needing highest capability Gemini model for complex agent tasks and reasoning.

Verdict

Gemini 3.5 Pro represents the ceiling of Google current model capabilities. For applications where Gemini 3.5 Flash isn't powerful enough, Pro will be the answer starting June 2026 .

Rating: N/A (Pre-release) - Coming June 2026.