Gemini 3.5 Pro enters general-availability window — Deep Think reasoning mode gated to $250/month Ultra subscription tier, 2M-token context confirmed
Google's Gemini 3.5 Pro is now inside its GA window, with analyst tracking placing the release between June 23 and June 30. Confirmed specs: 2-million-token context window (largest of any production frontier model), Deep Think reasoning mode gated to the $250/month Ultra subscription tier, multimodal across text and images. The Ultra-tier gating reflects Google's positioning of premium reasoning as enterprise-monetizable capability.
The substantive piece is the Ultra-tier-gating strategic shift. Google's H1 2026 pattern bundled premium frontier capability into standard subscriptions; the Deep Think gating to $250/month Ultra signals Google adopting the API-tier-only-frontier-access pattern that Anthropic established with Fable 5. The H2 2026 frontier-AI consumer-pricing landscape is consolidating around premium-tier-only access for the highest-capability features.
The competitive read against last week's June GA slip is that Google is now executing within the original I/O announcement window even after the limited-preview extension. The 2M-token context maintains the largest-context-window position briefly — until Llama 4 Scout's 10M open-source context and the rumored GPT-5.6 1.5M overtake on the long-context axis.
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