Google’s most-delayed model of the year is finally near the finish line. After being announced at I/O in May and then repeatedly slipping its general-availability date, Gemini 3.5 Pro is now reportedly targeting July 17 — though a quick, important caveat: Google hasn’t officially confirmed that date with a model card, API docs or pricing as of early July, so treat it as a strong target, not a promise.
The headline feature: a 2-million-token context window
The standout spec is a two-million-token context window — double Gemini 3.5 Flash and the largest deployed in any production frontier model to date. On paper, that means you can dump entire codebases, book-length documents, or sprawling data sets into a single prompt. The honest question, though, is whether the model can actually reason across all 2M tokens or merely retrieve from them — and that only gets answered by independent long-context evals, which don’t exist yet. Big window, unproven depth.
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Deep Think, gated behind the $250 tier
The other headline is Deep Think, an extended-reasoning mode aimed at hard, multi-step problems that benefit from the model “reflecting” longer before answering — the same territory as GPT-5.6 Sol’s ultra mode and Claude’s extended thinking. The catch: it’s reportedly locked to Google’s $250-per-month Ultra subscription. Frontier reasoning is increasingly a luxury SKU, not a default.
The takeaway
Gemini 3.5 Pro arriving — if July 17 holds — reloads the top of the model race just as GPT-5.6 goes public and Claude’s Mythos-class flagship is back online. That’s three frontier labs all shipping within weeks of each other, which is great for anyone buying. Just don’t pre-order the hype: a record context window and a premium reasoning mode are promising on the spec sheet, and completely unproven until the independent benchmarks land. We’ll update when it actually ships.