Gemini 3.5 Pro Misses Its Third Launch Target — Still No Public Release Date

In one line: Gemini 3.5 Pro has slipped past three announced launch windows and as of August 2026 remains in enterprise-only preview with no public GA date.

Key points

• Three missed targets: a post-Google I/O June window, July 17, and early August — none were met with a public release.
• As of August 12, access is limited to select Vertex AI enterprise preview partners; Google describes it only as "coming soon."
• Reported causes include coding performance shortfalls, a disappointing training-data refresh, and the departure of several senior researchers to rivals including Meta, OpenAI, and Anthropic.
• The model's headline specs — a 2-million-token context window (the largest of any production frontier model) and a built-in Deep Think reasoning mode — remain unverified in public testing.

Why it matters

Google has released no new frontier model since early 2026, making Gemini 3.5 Pro a must-ship for its competitive position against GPT-5.6 and Claude Fable 5. Three delays suggest the problem may run deeper than a schedule slip — reports point to a possible full retraining from pre-training, which could push the timeline out by months and ripple into Google's full-year model roadmap.

Read more

• Gemini 3.5 Pro Delay Continues — Forbes
• Three Delays and Still Unreleased — The AI Rankings