Google launches Gemini 3.5 Pro publicly with 2M-token context and Deep Think reasoning — first frontier-class model with 2M context as a default tier
Google shipped Gemini 3.5 Pro to general availability with a 2-million-token context window and Deep Think reasoning, available first through the $20/month Pro plan and $250/month Ultra plan (Deep Think exclusive to Ultra). The 2M-context default is the largest of any frontier-class model. Lands the same week as Anthropic Fable 5, GPT-5.6 leaks, and Grok 5 movements — buyers face four frontier launches in one window.
The substantive piece is the 2M-context default tier. Frontier-class models historically capped at 200K-1M context, with 2M+ reserved for niche long-context specialist SKUs (Llama 4 Scout's 10M context being the major outlier). Gemini 3.5 Pro making 2M the default context window collapses the long-context-vs-frontier-capability tradeoff that defined model selection for the past 18 months. Enterprise procurement teams evaluating long-context workloads (legal-document analysis, codebase-wide reasoning, multi-document synthesis) now have a frontier-class generalist as the natural fit.
The Deep Think exclusivity to Ultra is the pricing-segmentation signal. At $250/month, the Ultra tier prices Deep Think reasoning as the premium-research-grade SKU — comparable to Anthropic's Fable 5 / Mythos 5 stack in the two-tier capability productization pattern. Google's three-tier consumer-plan structure (free, $20 Pro, $250 Ultra) gives the most granular capability-segmentation surface of any frontier lab through mid-2026.
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