Gemini 3.5 Pro is expected to launch on Thursday, July 17, 2026 — two days from now, though Google has not confirmed the date. Leaked reports point to a 2-million-token context window, a Deep Think reasoning layer reserved for the $250-per-month Ultra tier, and a model rebuilt entirely from scratch — not an incremental upgrade from Gemini 2.5 Pro — after running more than six weeks behind its original late-June target.
- Launch: July 17, 2026 (2 days away) — widely reported, NOT confirmed by Google
- Leaked context window: 2 million tokens — the largest of any flagship model if true
- Deep Think reasoning: reportedly locked to the $250/month Ultra plan, not the $20 standard tier
- Architecture: complete rebuild from scratch — not incremental from Gemini 2.5 Pro; targets math reasoning, SVG generation, and image quality
- Leaked API pricing: ~$12–15/M input, ~$36–45/M output tokens — unconfirmed leak only; treat as speculation until launch
- Talent losses (June 2026): Noam Shazeer (Gemini co-lead) → OpenAI; John Jumper (Nobel laureate, AlphaFold) → Anthropic; Alphabet shed ~$270B in market cap across two trading sessions
- No official trace: no model card, no pricing page, no API listing as of July 15
What the Gemini 3.5 Pro Leaks Actually Say
As reported by TechTimes on July 13, Gemini 3.5 Pro is targeting a July 17 release after a full architectural rebuild — and every single spec remains unconfirmed. The headline leak is a 2-million-token context window, which would be the largest of any flagship model. For comparison, Anthropic’s Claude Fable 5 ships with a 200K standard window, and OpenAI has not publicly confirmed the context size for GPT-5.6 Sol.
The second major leak concerns Deep Think, a reasoning layer that reportedly lets the model work through multi-step problems autonomously. Multiple reports place Deep Think exclusively on the $250-per-month Ultra plan — not the $20 standard subscription. If accurate, this continues the industry trend of frontier reasoning being priced out of reach for individual developers.
Reports also suggest the rebuild specifically targets three weaknesses of the previous generation: mathematical reasoning, SVG scene generation, and image quality.
On API pricing, a leaked post circulating on X suggests ~$12–15 per million input tokens and ~$36–45 per million output tokens. These figures are unconfirmed — treat them as developer speculation until Google publishes an official pricing page. For context, Gemini 3.1 Pro currently costs $2/$12 per million tokens; if the leak is accurate, Gemini 3.5 Pro would sit in a significantly higher tier, reflecting the compute cost of Deep Think reasoning.
Why Google Rebuilt the Model From Scratch
Gemini 3.5 Pro was originally slated for late June 2026 — making this launch more than six weeks late. According to StartupFortune, Google delayed the launch after scrapping its base model entirely, citing “quality refinements after early enterprise testing.” A full rebuild this late in a release cycle is unusual — it signals either serious performance problems in the original model or unusually high ambitions for the replacement.
Notably, as of July 15 there is no model card, no pricing page, and no gemini-3.5-pro listing in the public Gemini API documentation. Whatever ships Thursday, Google is keeping it sealed until the moment of launch.
The Talent Losses That Raised the Stakes
The delay arrived alongside the most significant talent exodus Google has seen in its AI division. On June 18, Noam Shazeer — Gemini co-lead and co-author of the original Transformer architecture paper — left for OpenAI. The following day, John Jumper, the 2024 Nobel laureate who led AlphaFold, announced his move to Anthropic, along with fellow researchers Jonas Adler and Alexander Pritzel.
The exits triggered a roughly 7% drop in Alphabet’s stock on June 22, erasing an estimated $270 billion in market value across two trading sessions — a stark signal of how tightly investor confidence in Google is now linked to its AI leadership pipeline.
The departures matter beyond the stock chart. Shazeer’s institutional knowledge of transformer architecture runs deep, and Jumper’s move to Anthropic directly strengthens the team building Claude. That both men left during the very period when Gemini 3.5 Pro was being rebuilt from scratch adds context the spec sheets won’t include. Thursday’s launch is not just a product release; it’s Google’s first major public signal that the rebuild was worth the cost of losing them.
Thursday Could Be the Biggest 48 Hours in AI This Year
July 17 is also opening day of the Shanghai 2026 World AI Conference, where Chinese President Xi Jinping is expected to attend in person for the first time — a direct signal that China treats AI as a national priority. Several Chinese model launches from Baidu, Alibaba, and others are expected at the event. If Gemini 3.5 Pro lands the same day, the two announcements together would make it the densest 48-hour stretch of AI news in 2026.
The timing follows a crowded frontier-model summer: OpenAI’s GPT-5.6 Sol, Terra, and Luna family entered limited preview on June 26, and Google’s own Gemini 3.5 Flash has been serving as the family’s speed tier since earlier this year.
What We Still Don’t Know
Almost everything. Google has confirmed neither the date, the pricing, the context window, nor the existence of Deep Think. The leaked API pricing of $12–15/$36–45 per million tokens — if real — would place Gemini 3.5 Pro at roughly 6–8× the cost of Gemini 3.5 Flash, which may reflect the reasoning overhead of Deep Think. There are no verified quotes from Google executives about the launch. If July 17 passes without a release, it would be at least the second delay — we will update this article immediately either way.
FAQ
When is Gemini 3.5 Pro launching?
Gemini 3.5 Pro is expected to launch on July 17, 2026, but Google has not officially confirmed the date. The model was originally planned for late June 2026 and was delayed more than six weeks after Google reportedly rebuilt it from scratch.
What is the leaked context window for Gemini 3.5 Pro?
Leaked reports suggest a 2-million-token context window, which would be the largest of any flagship AI model. This figure is unconfirmed — as of July 15 there is no official model card or API documentation listing the spec.
How much will Gemini 3.5 Pro cost via API?
A leaked figure circulating on X suggests ~$12–15 per million input tokens and ~$36–45 per million output tokens. This is unconfirmed speculation — Google has published no official pricing. For comparison, Gemini 3.1 Pro is currently $2/$12 per million tokens.
How much will Gemini 3.5 Pro Deep Think cost?
Reports indicate the Deep Think reasoning feature will be reserved for Google’s $250-per-month Ultra plan rather than the $20 standard tier. Google has not confirmed any pricing, so treat this as a leak until launch day.
Why did Google delay Gemini 3.5 Pro?
Google reportedly scrapped the original base model and performed a full architectural rebuild, citing quality refinements after early enterprise testing. The delay ran more than six weeks past the original late-June target. The rebuild reportedly targets math reasoning, SVG scene generation, and image quality improvements.
Who left Google’s AI team before the Gemini 3.5 Pro launch?
Noam Shazeer, Gemini co-lead and co-author of the Transformer architecture paper, left for OpenAI on June 18, 2026. John Jumper, the 2024 Nobel laureate who led AlphaFold, moved to Anthropic on June 19. The exits erased roughly $270 billion in Alphabet market cap across two trading sessions.
