The short answer: Gemini 3.5 has not been officially announced, and there is no confirmed release date. The strongest official signal available is Google’s Gemini API deprecations page, which lists Gemini 3.1 preview models but does not list any Gemini 3.5 model [1].
What Google’s official documentation shows
Google’s Gemini API deprecations page lists several Gemini 3 preview entries, including gemini-3.1-pro-preview with a February 19, 2026 release date, gemini-3.1-flash-image-preview with a February 26, 2026 release date, and gemini-3.1-flash-lite-preview with a March 3, 2026 release date [1].
That same official page does not show a Gemini 3.5 release entry in the provided source result [1]. For now, that matters more than screenshots, benchmark rumors, or social posts: if Google has not put Gemini 3.5 in its official model documentation or announcement channels, a public release date is not confirmed.
What the “Gemini 3.5 leak” claims say
The leak narrative is mostly built around unofficial posts and videos. Several sources claim that Google is testing a next-generation model called Gemini 3.5, sometimes with the alleged codename “Snow Bunny” [3][
9][
10]. Some posts claim the model can generate 3,000 lines of code from a single prompt, but that claim is presented as leaked or secondhand information rather than a verified Google benchmark [
3][
9][
12].
Other rumor coverage points to alleged AI Studio A/B testing or internal checkpoints, with mixed claims about performance [8][
11][
14]. The claims are not even consistent: one YouTube summary says early results looked worse than Gemini 3.0 Pro, while another claims a 40% performance boost in coding and reasoning [
11][
13]. Another YouTube snippet explicitly cautions that the screenshots and benchmark claims are not verified or reproducible [
16].
The safest reading is that “Gemini 3.5 leaked” is plausible as a rumor, but not established as a verified public product. None of the provided rumor sources substitutes for an official Google release note, model card, API listing, or product announcement.
When could Gemini 3.5 be released?
There is no evidence-backed date. Some rumor posts floated early-2026 timing, including February or March windows, but those predictions are not supported by the official Google documentation result, which still shows no Gemini 3.5 entry [1][
6][
10].
If you want a purely speculative window, prediction-market data points toward mid-2026. A Manifold market for Gemini 3.5 showed 34% odds before June 2026, 44% before July, 60% before August, and 67% before September [2]. But that is only a measure of bettor expectations. It is not a Google roadmap, and it should not be treated as confirmation.
The market’s own rules also highlight an important distinction: public availability counts only if the model is accessible without individual vetting or invitation, while closed betas, invite-only access, A/B tests, and anonymous benchmark appearances do not count as a release [2]. That is a useful standard for evaluating future “leaks.”
How to tell when Gemini 3.5 is actually real
A credible Gemini 3.5 launch should show up in at least one official Google channel, such as Google’s Gemini API documentation or an official product page. The current official documentation source lists Gemini 3.1 preview models, not Gemini 3.5 [1].
Until that changes, treat the following as weak evidence:
- anonymous benchmark screenshots;
- claims of hidden AI Studio checkpoints;
- social-media posts about internal codenames;
- YouTube videos repeating leak claims;
- prediction markets or blog posts estimating a launch month.
Those can be useful signals to watch, but they are not proof of a release date.
Bottom line
Gemini 3.5 is not officially released, and its release date is not confirmed. The most defensible answer is that Google’s public documentation currently supports Gemini 3.1 preview availability, while Gemini 3.5 remains an unverified rumor cluster [1]. A June–August 2026 window is a reasonable speculative guess only because prediction-market expectations cluster there, not because Google has announced it [
2].
