ChatGPT is an AI assistant from OpenAI that uses large-scale language models to understand prompts and generate human-like text. It can answer questions, explain concepts, draft and refine writing, help with coding, and hold contextual conversations across many subjects—all in natural language.
Gemini is Google’s multimodal AI platform—available via app, Workspace, Search, API, and local integration—that supports text, images, audio, and video input. It offers agentic features like Deep Research (multi-step reasoning), Gemini CLI for terminal tasks, and AI Mode in Search with real-time calling.
Grok is xAI’s generative-AI assistant—integrated with Elon Musk’s social-media platform X—that draws on the Grok large-language-model family (now at Grok-3). Launched in November 2023, it positions itself as a “truth-seeking” bot that gives relatively unfiltered, sometimes humorous answers, while offering strong reasoning, coding help, and long-context support (up to 128 k tokens in Grok-1.5) plus multimodal vision capabilities introduced in Grok-1.5V