Gemini 3.5 Pro confirmed specs ahead of GA — 2M context window, Deep Think reasoning mode, ~10x Flash pricing target ($15/$60 per 1M tokens)
Google has confirmed Gemini 3.5 Pro's headline specifications: 2-million-token context window, Deep Think reasoning mode, frontier multimodal understanding across text/images/video/audio. Expected pricing follows the historical ~10x Flash ratio at approximately $15 input / $60 output per 1M tokens. The specs sit in line with the H2 2026 frontier-pricing tier but no longer differentiated on context length.
The substantive piece is the cost-per-token tier alignment, not the capability differentiation. Gemini 3.5 Pro at $15/$60 per 1M tokens prices at parity with Claude Opus tier and the rumored GPT-5.6 Pro pricing. The capability differentiation that previously justified the price premium — particularly long-context — is no longer Gemini-unique with Llama 4 Scout's 10M open-source context and GPT-5.6's leaked 1.5M context.
The Deep Think reasoning mode is the differentiator Google is leaning on for the H2 2026 competitive position. Whether Deep Think delivers measurable advantage over Claude Mythos/Fable 5 reasoning and OpenAI's o-series reasoning will determine whether Gemini 3.5 Pro takes share at the premium tier or just stays at parity. The June 30 GA target (now slipped) was the inflection point procurement was watching.
Codersera — Gemini 3.5 Pro: The June 2026 Launch Guide → · ChatForest — Gemini 3.5 Pro Is Shipping in June — Should You Wait or Build on Flash Now? → · FindSkill — Gemini 3.5 Pro: Release Date & What It Means for You →