If you searched “Gemini 3.5 Pro release date,” here is the honest status: the release date does not exist. Google promised the model “next month” at I/O 2026, missed June, missed July, and shipped two better Flash models instead. This page is the running status record — the full delay timeline with dates, what Google has said officially at each step, and what to actually run while Pro stays unreleased.
Quick links
- Is Gemini 3.5 Pro released yet?
- Why is Gemini 3.5 Pro delayed?
- What has Google said officially?
- What did Google ship instead?
- What should you use instead of Gemini 3.5 Pro?
- What about the 2M-token context window?
- FAQ
Is Gemini 3.5 Pro released yet?
No. As of August 20, 2026, three months after its announcement, all of the following are still true:
- No
gemini-3.5-promodel ID exists in the Gemini API, Vertex AI, or on OpenRouter. - No model card or system card has been published.
- No pricing has ever been announced.
- No launch post exists on Google’s blog.
The Pro-tier flagship you can actually call remains Gemini 3.1 Pro (preview), launched February 19, 2026. And in an awkward twist for Google’s naming scheme, the best Gemini model available today isn’t a Pro model at all — it’s Gemini 3.7 Flash, which outscores the Pro line on most of Google’s own published benchmarks.
Why is Gemini 3.5 Pro delayed?
Coding performance. That’s the reason reported by Bloomberg in mid-July: Google is “taking time to try to improve [3.5 Pro’s] capabilities, particularly in coding,” after late-June training runs with updated data “yielded disappointing results.” The delay was significant enough to move markets — Alphabet shares fell on the news on July 16, 2026 (CNBC).
The full slip trail, with dates:
| Date (2026) | Status of Gemini 3.5 Pro |
|---|---|
| May 19 | Announced at I/O: “already being used internally, and we look forward to rolling it out next month.” Gemini 3.5 Flash ships the same day; Pro doesn’t. |
| June 25 | Business Insider: the release has slipped to July. |
| July 16 | Bloomberg/CNBC: delayed over coding performance; late-June retrains disappointed; Alphabet stock dips. Google: “currently testing 3.5 Pro, an upgraded Flash model, and other models with partners.” No new date. |
| July 21 | Google ships the “upgraded Flash” (Gemini 3.6 Flash) plus 3.5 Flash-Lite and 3.5 Flash Cyber. On Pro: “we plan to make it broadly available as soon as it’s ready.” |
| August 13 | Gemini 3.7 Flash ships. No mention of Pro at all. |
“Next month” became “July,” then “as soon as it’s ready,” then silence. That progression — each statement weaker than the last — is why treating any current “Gemini 3.5 Pro release date” claim as speculation is the only defensible position.
What has Google said officially?
Three on-record statements, in order:
- May 19, 2026 (I/O launch post): “We’re also hard at work on 3.5 Pro. It’s already being used internally, and we look forward to rolling it out next month.”
- July 16, 2026 (statement to press): Google is “currently testing 3.5 Pro, an upgraded Flash model, and other models with partners.”
- July 21, 2026 (Flash launch post): On the Pro line — “currently testing with partners and we plan to make it broadly available as soon as it’s ready.”
There has been no official Pro statement since July 21. HN chatter claims leaks say Google’s latest Pro attempt “was not competitive” — treat that as anecdote, not fact. What is fact: no date, no model ID, no card, no price.
What did Google ship instead?
A monthly Flash cadence. While Pro slipped, the Flash line shipped three times:
- Gemini 3.5 Flash (May 19) — GA day one everywhere, $1.50/$9.00 per 1M tokens. Widely seen as mispriced: roughly a 3x hike over its predecessor.
- Gemini 3.6 Flash + 3.5 Flash-Lite + 3.5 Flash Cyber (July 21) — 3.6 Flash improved coding (DeepSWE 49% vs 37%, Google self-reported) with 17% fewer output tokens, at an introductory $0.75/$3.75. Flash-Lite landed at $0.30/$2.50 running ~350 tok/s. Flash Cyber is a cybersecurity fine-tune in a limited government/partner pilot.
- Gemini 3.7 Flash (August 13) — “our most intelligent workhorse model yet for coding and agents.” Artificial Analysis Intelligence Index 56 (vs 3.6’s 52, Claude Sonnet 5’s 55, GPT-5.6 Terra’s 57), 1M-token context, intro pricing $0.75/$3.75 until December 31, 2026.
On Google’s own published numbers, 3.7 Flash now outscores the Pro line on most benchmarks. The practitioner consensus as of August 2026: Flash is better than Pro for now. Whatever 3.5 Pro eventually is, it has to beat Google’s own $0.75 workhorse to justify existing — which may be exactly why it keeps slipping. Full 3.7 Flash specs, benchmark provenance, and migration notes: our Gemini 3.7 Flash launch guide.
What should you use instead of Gemini 3.5 Pro?
Two answers, depending on what you were waiting for:
- For most work: Gemini 3.7 Flash. Google’s best available model, period — strongest published coding/agent scores in the family, 1M-token context, and $0.75/$3.75 per 1M tokens during the intro window (standard $1.50/$7.50 from January 1, 2027). Batch and Flex run at 50% off.
- For Pro-class API needs: Gemini 3.1 Pro (preview). Still the Pro flagship, at $2.00/$12.00 per 1M tokens up to 200K context and $4.00/$18.00 above it. Pick it when your workload specifically depends on the Pro line rather than raw benchmark scores.
| Model | Context | Price ($/1M in / out) | Status |
|---|---|---|---|
| Gemini 3.5 Pro | never confirmed | never announced | Unreleased, no date |
| Gemini 3.7 Flash | 1M | $0.75 / $3.75 intro (then $1.50/$7.50) | GA since Aug 13 |
| Gemini 3.6 Flash | 1M | $0.75 / $3.75 intro | GA since Jul 21 |
| Gemini 3.5 Flash-Lite | 1M | $0.30 / $2.50 | GA since Jul 21 |
| Gemini 3.1 Pro (preview) | 1M | $2.00 / $12.00 (≤200K); $4/$18 above | Current Pro flagship |
Because the whole family shares the same SDK surface, hedging is cheap: build against a config-driven model ID today, and if 3.5 Pro ever ships, switching is a one-line change. That advice from the pre-delay version of this guide aged perfectly — teams that shipped on Flash in May have upgraded twice since; teams that waited for Pro are still waiting.
What about the 2M-token context window?
The 2M-token context was always expectation, never confirmation — it appeared in pre-launch speculation, not in any Google spec. With 3.5 Pro unshipped, no Gemini model offers 2M tokens today. Gemini 3.1 Pro and Gemini 3.7 Flash are both 1M-token models. If your architecture assumed a 2M window arriving in June 2026, re-plan around 1M plus retrieval; there is no announced timeline for anything larger.
The same goes for every pre-launch expectation table you may have seen (including the one this guide used to carry): projected benchmark ranges and the “$2-3 input” pricing guesses were extrapolation from the 3.1 generation, made before the delay. With late-June training runs reportedly disappointing, those extrapolations no longer have a foundation. We’ve retired them rather than re-date them.
What happened to Gemini CLI?
One migration note from the original guide that did happen on schedule: Gemini CLI was sunset on June 18, 2026 for Google-auth tiers, replaced by Antigravity CLI (announced May 19). If any automation still calls the hosted gemini command, it stopped working two months ago. The open-source google-gemini/gemini-cli repo remains active — v0.56.0 stable shipped August 19, 2026 — but the hosted-auth path is Antigravity CLI now.
Pillar guide
For the whole Gemini family — every shipped model, pricing, benchmarks, and how it compares to Claude and GPT — see our Gemini 3.5 complete guide for 2026.
Codersera: hire engineers who already know the Gemini stack
A flagship that slips indefinitely while three Flash models ship around it is the 2026 model landscape in miniature — the teams that win are the ones that can re-evaluate and migrate in days, not quarters. Codersera matches you with vetted remote developers who ship production AI systems: model evaluation, migration, context-window architecture, and cost engineering. Risk-free trial, technical fit guaranteed.
FAQ
Is Gemini 3.5 Pro available right now?
No. As of August 20, 2026 there is no gemini-3.5-pro model ID in the Gemini API, Vertex AI, or OpenRouter, no model card, and no pricing. Google announced it May 19, 2026 for a “next month” release that never happened.
Why is Gemini 3.5 Pro delayed?
Coding performance, per Bloomberg’s July 16 reporting: Google is taking time to improve the model’s capabilities “particularly in coding,” after late-June training runs with updated data yielded disappointing results. Alphabet’s stock fell on the delay news.
When will Gemini 3.5 Pro launch?
Unknown. Google’s last official statement (July 21, 2026) gave no date — only “as soon as it’s ready.” There has been no official update since, including at the August 13 Gemini 3.7 Flash launch, which didn’t mention Pro at all.
What should I use instead of Gemini 3.5 Pro?
Gemini 3.7 Flash for most workloads — it’s Google’s strongest available model at $0.75/$3.75 per 1M tokens (intro pricing through December 31, 2026). If you specifically need the Pro line, Gemini 3.1 Pro (preview) at $2/$12 remains the Pro flagship.
What is the Gemini 3.5 Pro context window?
Never confirmed. The widely-cited 2M-token figure was pre-launch expectation. With the model unshipped, no current Gemini model offers 2M tokens — Gemini 3.1 Pro and 3.7 Flash are both 1M.
How much will Gemini 3.5 Pro cost?
No price has ever been announced. The nearest reference point is Gemini 3.1 Pro at $2.00 input / $12.00 output per 1M tokens (up to 200K context; $4/$18 above). Any specific 3.5 Pro price you see elsewhere is invented.
Is Gemini 3.7 Flash better than Gemini’s Pro models?
On Google’s own published benchmarks, yes — 3.7 Flash outscores the Pro line on most of them, and it carries an Artificial Analysis Intelligence Index of 56 as of August 2026. The practitioner shorthand is “Flash is better than Pro for now.”
What happened to Gemini CLI?
The hosted Gemini CLI was sunset June 18, 2026, replaced by Antigravity CLI. The open-source repo is still releasing (v0.56.0 stable, August 19, 2026), but Google-auth tiers must use Antigravity CLI.
Did Google ship anything in the 3.5 family?
Yes — the Flash side shipped fully: Gemini 3.5 Flash (May 19), 3.5 Flash-Lite and 3.5 Flash Cyber (July 21), plus the follow-on 3.6 Flash (July 21) and 3.7 Flash (August 13). Only the Pro tier is missing.
