Flash Forward: Google’s New Gemini 3 Flash Shatters Efficiency Records and Rival Flagships

Google has unveiled Gemini 3 Flash, a high-efficiency variant positioned to deliver near‑flagship, pro‑level reasoning at a significantly lower computational cost. According to figures released by Google, this lightweight model has outperformed OpenAI’s GPT‑5.2 in several benchmark tests, with MMMU‑Pro scoring 81.2% to GPT‑5.2’s 79.5% and Humanity’s Last Exam showing Gemini 3 Flash trailing GPT‑5.2 by less than a single percentage point in a closed‑book test.

Like Gemini 3 Pro, the Flash model is being rolled out immediately across the Gemini app and Google Search’s AI Mode, where it becomes the default model for both services. The article notes that users worldwide—including those on free tiers—gain direct access to Gemini 3‑level reasoning power at no cost. While benchmark scores aren’t the sole measure of value, the release signals intensified pressure on OpenAI’s subscription model as a cost‑effective rival nears flagship performance. 19 December 2025.