Gemini 3.5 Pro

Google's next flagship Pro-tier Gemini model, announced at Google I/O 2026 on May 19. It's the high-end counterpart to the already-released Gemini 3.5 Flash, targeting the hardest reasoning, coding, and long-context work — Google has pointed to a context windowThe maximum amount of text the model can "see" at once — prompt plus prior conversation plus any documents you give it. Measured in tokens (which are roughly three-quarters of a word each). A 128K context window is about 96,000 words of input — roughly a 400-page book. Larger context windows let the model work with bigger documents but cost more to run. of up to 2 million tokens. Pricing and exact specs were not disclosed at announcement.

It's expected to be Google's strongest model and the new top of the Gemini line — the reference point that current Pro and most closed flagships will be measured against.

Not yet released. Sundar Pichai said it ships "next month" (June 2026) with no committed date, and no pricing, final benchmarks, or API availability have been published. Writing a full entry now would mean inventing specs.

Gemini 3.5 Pro is the most-anticipated piece of the Gemini 3.5 family — the I/O 2026 audience reportedly reacted audibly when its launch was pushed to "next month." Until it ships with real pricing and independently verifiable benchmarks, the current production Pro tier is Gemini 3.1 Pro, and the new default everyday model is Gemini 3.5 Flash. When 3.5 Pro reaches general availability, promote this to a full entry and note the transition date; at that point Gemini 3.1 Pro likely moves to feature-frozen.