Google's next flagship AI model just got a timeline. Koray Kavukcuoglu — the new chief of Google DeepMind — said this week that Gemini 4 has entered post-training, and he expects it to arrive "much earlier" than the end of the year.
The comment came during his first public appearance since taking over DeepMind, at The Information's AI Agenda Live Summit. His quote: "Our intention is to roll out an early post-training version as soon as possible, because we've already seen promising results and are very excited."
What post-training actually means
Post-training is the last big phase before a model meets the public. The heavy pre-training — where the model absorbs its data — is done. What's left is the careful tuning that teaches it to follow instructions, use tools, hold conversations, and refuse things it should refuse. Reaching this stage is a genuine timing signal, even though Google hasn't published benchmarks, pricing, or a feature list yet.
Why this is a big deal
Google hasn't shipped a new flagship model since Gemini 3 in November 2025. Since then, rivals have pulled ahead: OpenAI launched GPT-6 Astra on September 3, and Anthropic unveiled Claude Fable 5.1 on September 1. Investors got jittery too — Alphabet shares slipped nearly 5% over two sessions this week on concerns that Meta's Muse AI agent is gaining traction with consumers.
Gemini 4 is Google's answer. CEO Sundar Pichai has called it the company's "most ambitious pre-training run yet," with much larger base models designed to keep Google at the frontier.
My take
The most interesting detail isn't the model — it's the plan. Kavukcuoglu promised "fast-paced iterations" after launch, signaling Google is done with long, silent gaps between flagship releases. The frontier race is becoming a release-speed race, and Google finally looks like it intends to compete on tempo, not just scale. Don't expect an exact date until Google is sure the model is ready — early post-training can run a few weeks or a couple of months. But the message is clear: Gemini 4 is real, it's being polished, and it won't wait until December.
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