# Gemini 3.5 Pro still not out as its 'next month' window closes

> Gemini 3.5 Pro, announced 'next month' at Google's 19 May I/O, still wasn't out by late June.

*Announced at I/O, due 'next month' — and late June arrived without it.*

By The FeaturedDaily Desk · FeaturedDaily
Canonical: https://featureddaily.com/news/gemini-3-5-pro-still-not-out-brief

> **Key:** **The one-liner:** Google said Gemini 3.5 Pro was 'next month' at its May I/O event. It's late June and the model still isn't public — the one you can use is Gemini 3.5 Flash.

## What happened

At **Google I/O on 19 May 2026**, Google launched **Gemini 3.5 Flash** — fast, cheap, and immediately the default in the Gemini app and Search's AI Mode — and **announced Gemini 3.5 Pro** without releasing it, saying Pro was being used internally and would roll out **'next month'**. Said in mid-May, that pointed squarely at June. By late June, the window had effectively closed: Pro was not in the consumer Gemini app, not in Google AI Studio (where developers test models), and not in the stable API. Flash remained the 3.5 model people can actually use today, and the only one with a published model card.

> Google announced Gemini 3.5 at I/O on 19 May 2026, shipping Flash as the default across the Gemini app and AI Mode in Search while describing the larger Pro model as in internal use and rolling out the following month.
> — [Google](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-5/), 2026-05-19

## The catch

Two cautions. First, the impressive specs in circulation — a **~2-million-token context** and a **'Deep Think'** mode — are trade-press expectations, **not** Google-confirmed figures for 3.5 Pro; Flash's confirmed context is about 1M tokens. Second, a late flagship is normal: larger models usually trail their faster siblings because evaluation and serving take longer, so the slip mainly shows the 'next month' framing was optimistic, not that the model is troubled. The signal that Pro has gone from announced to usable is concrete — a stable API model ID and a published model card with benchmarks. Neither existed as of late June.

> **Note:** **What to watch.** A stable Gemini 3.5 Pro API endpoint and a model card with benchmark numbers. Until then, build on Gemini 3.5 Flash and treat Pro as a roadmap item, not an available tool.

## Key takeaways

- What: Google announced Gemini 3.5 Pro at I/O (19 May 2026) but did not release it, saying it was due 'next month'.
- Status: by late June 2026, still not public — no consumer app, AI Studio or stable API.
- Context: Gemini 3.5 Flash, launched the same day, is the available 3.5 model.
- Caveat: the reported 2M-token context and 'Deep Think' mode are not confirmed by Google.

## FAQ

### Is Gemini 3.5 Pro released?
No. As of late June 2026 it was announced (at I/O on 19 May) but not public — not in the Gemini app, AI Studio or stable API. Gemini 3.5 Flash is the available 3.5 model.

### Didn't Google say June?
Google said 'next month' in mid-May, pointing to June, and described Pro as in internal use. By late June it still hadn't shipped publicly — a soft window that slipped.

### Are the 2M-token and 'Deep Think' specs real?
Unconfirmed. They come from trade-press reports, not Google's stated specs for 3.5 Pro. Flash's confirmed context is about 1M tokens. Wait for Google's model card.

## Sources

- [Gemini 3.5: frontier intelligence with action](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-5/) — Google, 2026-05-19
- [100 things we announced at Google I/O 2026](https://blog.google/innovation-and-ai/technology/ai/google-io-2026-all-our-announcements/) — Google, 2026-05-19
- [Google Gemini 3.5 Pro Nears June Launch With 2 Million Token Context And Deep Think Reasoning](https://www.techtimes.com/articles/317919/20260606/google-gemini-35-pro-nears-june-launch-2-million-token-context-deep-think-reasoning.htm) — Tech Times, 2026-06-06