Google's Gemini 3.5 Pro was first announced at the company's I/O developer conference in May 2026, where CEO Sundar Pichai told developers to "give us until next month to get it to you," setting an initial June launch expectation. That June target came and went without a release, and Business Insider reported on June 24, 2026, that Google had pushed the launch to July while it gathered feedback from early testers and tweaked the model. A Google spokesperson declined to comment at the time.
Fast-forward to July 16, 2026, and the situation has worsened rather than improved. According to 9to5Google, the July timeline has also now passed with no public release. The outlet, citing Bloomberg, reports that Google is "taking time to try to improve [Gemini 3.5 Pro's] capabilities, particularly in coding," and that an updated training data set in late June "produced disappointing results." Google's only public statement is that it is "currently testing 3.5 Pro, an upgraded Flash model, and other models with partners."
TechTimes goes further, reporting that Gemini 3.5 Pro has now missed three consecutive launch deadlines — June, July 17, and now an open-ended slip beyond that. Citing Geeky Gadgets and World of AI, the outlet describes persistent problems including frequent hallucinations and a failure to match GPT-5.6 in key benchmarks, with reports that Google DeepMind may be pivoting toward stopgap Flash releases while the Pro rebuild continues. Notably, as of today, Gemini 3.5 Pro still does not appear as a generally available model in Google's public API documentation, where only gemini-3.5-flash and gemini-3.1-pro-preview are listed.
The original tweet by @zephyr_z9 simply states "Gemini 3.5 Pro is delayed," quoting another user who expressed concern about Google's competitive position. That core claim — that the model has been delayed — is corroborated by three independent sources: one from June 24 confirming the first slip from June to July, and two from today confirming the model has now also missed its July 17 target. The evidence strongly supports the claim. The context of competitive pressure and the specific reasons (coding performance, hallucinations) are additional details the tweet does not address, but they do not contradict the simple assertion that the model is delayed. For developers and Google watchers, the practical implication is clear: Gemini 3.5 Pro should not be treated as a firm dependency for any near-term launch plans.
