Is Gemini 3.5 Pro generally available yet?

No. As of late July 2026, Gemini 3.5 Pro is still in limited Vertex AI enterprise preview and has not reached general availability. Google announced it at Google I/O on May 19, 2026, targeted GA for June, slipped to July, and a rumored July 17 launch also passed. Google shipped Gemini 3.6 Flash and 3.5 Flash-Lite instead, but the Pro tier remains pending.

Why is Gemini 3.5 Pro delayed?

Google cited quality refinements after early enterprise testing. Reporting also noted several senior Google researchers departing for Anthropic around the same time. The model has been rebuilt/refined more than once, pushing GA from June to July and then past a rumored July 17 date, with no confirmed public launch as of July 26, 2026.

What should I use instead of Gemini 3.5 Pro?

For Google's stack, Gemini 3.6 Flash ($1.50/$7.50, the new default since July 21) is the workhorse and uses up to 65% fewer output tokens than 3.5 Flash. For frontier reasoning, use Claude Opus 4.8 ($5/$25) or GPT-5.6 Sol ($5/$30). For value, Grok 4.5 ($2/$6) or Claude Sonnet 5 ($2/$10 intro). Announced Gemini 3.5 Pro pricing is $15/$60 — premium — so weigh that when it does land.

Quick Answer

Gemini 3.5 Pro Still Not GA: What to Use Instead

Published: July 26, 2026

The Short Answer

Gemini 3.5 Pro is still not generally available as of July 26, 2026. It’s in limited Vertex AI enterprise preview after two slipped targets:

Announced at Google I/O, May 19, 2026
Original GA target: June 2026 → pushed to July 2026
Rumored July 17 launch → passed without a broad public release

Google shipped the Flash tier instead (Gemini 3.6 Flash and 3.5 Flash-Lite on July 21), but the flagship Pro model remains pending — reportedly held for quality refinements after enterprise testing, amid reports of senior researchers leaving for Anthropic.

Current Gemini Lineup (July 2026)

Model	Status	$/MTok in	$/MTok out	Notes
Gemini 3.6 Flash	GA (default since Jul 21)	$1.50	$7.50	Up to 65% fewer output tokens vs 3.5 Flash
Gemini 3.5 Flash	Being sunset	$1.50	$9.00	Replaced by 3.6
Gemini 3.5 Flash-Lite	GA (Jul 21)	$0.30	$2.50	Cheap tier
Gemini 3.1 Pro	GA	$2.00	$12.00	Current usable Pro tier
Gemini 3.5 Pro	Preview only	$15*	$60*	*Announced pricing; not GA

What to Use Instead (Right Now)

Staying on Google’s stack:

Gemini 3.6 Flash ($1.50/$7.50) — the new default workhorse, faster and cheaper per task thanks to ~65% output-token reduction. Best everyday pick.
Gemini 3.1 Pro ($2/$12) — if you need a “Pro”-class Gemini today, this is the GA option.

If you want frontier quality now (any provider):

Claude Opus 4.8 ($5/$25) — hardest reasoning and agentic coding.
GPT-5.6 Sol ($5/$30) — top composite on the Artificial Analysis Index.
Claude Sonnet 5 ($2/$10 intro through Aug 31) or Grok 4.5 ($2/$6) — best value workhorses.

Should You Wait for 3.5 Pro?

Only if you’re locked to Google and need the top Gemini tier. Two things to weigh:

Timing risk — it has missed two targets; a firm GA date still isn’t confirmed.
Price — announced at $15/$60 per MTok, it would be one of the most expensive frontier models. At that rate, Opus 4.8 ($5/$25) and Sol ($5/$30) are cheaper for comparable frontier work.

For most teams, run Gemini 3.6 Flash now and re-evaluate when 3.5 Pro actually ships GA with confirmed pricing — don’t block a project waiting on a preview.

Sources

Gemini 3.5 Pro slips to July (getbind, 2026): blog.getbind.co/gemini-3-5-pro-slips-to-july
Google releases two new Gemini models (not Pro) (Mashable): mashable.com/tech/google-releases-two-new-gemini-models-not-pro
Gemini 3.5 Pro release-date tracking (FindSkill): findskill.ai/blog/gemini-3-5-pro-release-date