Gemini (Google)
Google's frontier LLM family — Google DeepMind, launched December 2023. Natively multimodal (text + image + audio + video).
Family: Nano (on-device, Pixel), Flash (fast), Pro (balanced), Ultra/2.5 Pro (frontier). 1M+ tokens context since 1.5 (March 2024). 2.0 (2024) introduced "Thinking" mode for reasoning. 2.5 Deep Think (2025) competes directly with the GPT o-series and Claude reasoning.
Available via gemini.google.com, AI Studio, Vertex AI, the Gemini CLI. Rebranded from Bard in 2024. Powers Google Search (AI Overviews) and NotebookLM.