Google's Gemini 3.5 Pro is months behind schedule as internal factions and coding quality slow release. The delay raises questions about AI leadership as rivals advance.
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Google is months behind schedule on its most advanced AI model, Gemini 3.5 Pro, Bloomberg reported Thursday (July 16), citing people familiar with the matter. The model was expected to launch at the company's I/O conference in May but remains in development, held up by coding performance that trails rivals.
The delay partly reflects Google's internal structure. Multiple teams are building their own AI coding tools, and the number of stakeholders needed to clear a model for release has slowed progress, Bloomberg's sources said.
A Google spokesperson acknowledged the work in progress. "We're shipping quickly across a wide range of models while keeping them highly cost-effective for customers," the spokesperson said, per Bloomberg. The company also said it is testing 3.5 Pro, an upgraded Flash model, and other models with partners, and is "productively engaged with the U.S. government on model testing and broader frameworks."
The hold-up leaves the Gemini line without its flagship tier. Rival models from OpenAI, Anthropic, and others have continued to gain traction. Google has already shipped Gemini 3.5 Flash, which CEO Sundar Pichai said in May is the default across the Gemini app and Search's AI Mode. The app serves more than 900 million monthly users in 230 countries, with daily queries up sevenfold.
For cloud customers and developers who use Gemini through Google Cloud's Vertex AI, the delay means the most capable model is not yet available. Enterprise clients evaluating which platform to standardize on for coding and reasoning workloads must wait for the promised upgrade.
Pichai, speaking at the May event, said the company was "excited for Gemini 3.5 Pro" and that it would arrive "next month." That timeline has now slipped by roughly two months, and no new launch date has been set.
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