Alphabet shares slipped after a report that Google's most powerful artificial intelligence model is running behind schedule.
According to Bloomberg, which cited unnamed sources, Google is months behind on delivering Gemini 3.5 Pro, its flagship AI model. The delay stems from the company's efforts to improve the model's capabilities, Bloomberg reported, particularly its performance on coding tasks.
The timing matters because Google had already set expectations. As CNBC noted, Alphabet announced Gemini 3.5 Pro in May, saying the model was being used internally but would not be ready for a broader rollout until the following month. Instead of arriving on that timeline, the model has slipped by months.
Investors reacted quickly. Multiple financial outlets reported that Alphabet stock fell on the news, with Investing.com, Benzinga and The Tech Buzz describing the shares as sinking or tumbling on the report of the delay.
The stumble lands in the middle of an intense race among the largest technology companies to ship ever more capable AI systems. Coding ability in particular has become a closely watched benchmark, as businesses increasingly lean on AI tools to write and debug software. Google's decision to hold Gemini 3.5 Pro back rather than release it suggests the company would rather delay than ship a model it considers not yet ready.
For Alphabet, the episode is a reminder of how tightly its stock is now tied to the perception that it can keep pace at the frontier of AI.
Why it matters: Alphabet's market value increasingly rides on whether Google can deliver leading AI on schedule, and a delay to its top model shows how quickly investor confidence can wobble.