A securities class action filed in October 2026 accuses Alphabet and Sundar Pichai of misleading investors about the readiness of Gemini 3.5 Pro, alleging disappointing training results left Google months behind schedule.
The complaint, filed in the U.S. District Court for the Northern District of California on behalf of investors who purchased Alphabet securities between May 19, 2026 and July 16, 2026, alleges that the company failed to disclose that Gemini 3.5 Pro was delivering disappointing training results, and that as a result the launch of the flagship AI model would be significantly delayed — rendering the company's positive statements about its business, operations and prospects materially misleading.
According to the complaint, on May 19, 2026, Alphabet hosted its annual Google I/O developer conference, where CEO Sundar Pichai announced that the much-anticipated Gemini 3.5 Pro would launch in June 2026. Then on July 16, 2026, at approximately 2:00 PM Eastern, Bloomberg reported that Google was "months behind schedule on delivering Gemini 3.5 Pro, its most powerful flagship AI model," due to ongoing coding efforts. The complaint alleges that late last month Google had updated the data being used to train Gemini in an attempt to improve its skills, "but the results were disappointing."
On the Bloomberg report, Alphabet's Class A common stock fell $16.46, or 4.4%, to close at $354.46 per share on July 16, 2026, on unusually heavy trading volume. The Class C shares fell $16.39, or 4.4%, to close at $353.58.
The suit is one of several securities actions filed against high-flying AI companies this fall, as investors increasingly scrutinize whether Big Tech's lofty AI promises match engineering reality. Alphabet has not publicly commented on the complaint. The case will now move through lead-plaintiff proceedings in California federal court, with the outcome watched closely by investors betting on the AI race.
The alleged delay put Google on the defensive in an AI race where perception matters enormously. Rivals have shipped flagship models on aggressive timelines, and any sign that Google's most powerful system was struggling in training feeds a narrative that the search giant is playing catch-up. Whether the lawsuit survives a motion to dismiss remains to be seen — securities cases built on product delays face high legal hurdles — but the filing itself has already added to the scrutiny of Big Tech's AI promises. For Alphabet, the lawsuit is an unwelcome distraction as it races to prove that its massive AI investments will translate into products that justify the spending, with investors watching every milestone — and every delay — closely.