Google Begins Gemini 4 Training as 3.5 Pro Stalls

Google DeepMind's Logan Kilpatrick said July 21 that pre-training for Gemini 4 has begun — the team's most ambitious run yet. Three Flash-tier models shipped the same day, but the flagship Gemini 3.5 Pro, last updated in February and promised for June, still has no firm date. Kilpatrick said it is in partner testing and hopes to ship "soon." Bloomberg reported delays tied to missed performance targets.