Leaked internal details suggest Google DeepMind is targeting July 17, 2026 for the release of Gemini 3.5 Pro, following a full rebuild of the model rather than an iteration on Gemini 2.5 Pro. Reports say engineers scrapped the original base after hitting structural failures in recursive tool-calling and SVG generation, plus internal staff turnover.
The leaked specs point to a 2-million-token context window, roughly double the largest context windows offered by comparable frontier models today, alongside a new "Deep Think" reasoning layer aimed at multi-step logic, math, and autonomous multi-file coding workflows.
Google has not confirmed any of it: as of the leak, no model card, pricing page, or Gemini API listing for 3.5 Pro existed publicly, and claims that it outperforms rival models in private testing remain unverified. Developers are effectively planning around a leak, not a signed launch announcement.