Claude

ChatGPT is OpenAI's flagship conversational AI, powering hundreds of millions of weekly users across web, mobile and API. Built on the GPT-4o and GPT-5 family of models, it handles text, images, voice and code in a single interface. With browsing, data analysis, custom GPTs and a vast plugin ecosystem, it remains the default assistant for most knowledge workers.

Gemini is Google's natively multimodal model family, deeply integrated across Search, Workspace, Android and the Pixel line. Its standout feature is an enormous context window of up to one to two million tokens, ideal for analysing long videos, codebases and document sets. Gemini blends Google's real-time knowledge with strong reasoning and is available free in many products.

DeepSeek is a Chinese AI lab that stunned the industry with frontier-level reasoning models at a fraction of typical costs. Its R-series reasoning models and V-series chat models are open-weight and extremely cheap via API. DeepSeek is the go-to choice for developers who need strong math, coding and reasoning performance on a tight budget.

Mistral AI is a European lab offering both open-weight and commercial models that punch well above their size. Le Chat is its consumer assistant, while models like Mistral Large and the Mixtral mixture-of-experts series power developers via API. Mistral is popular for on-premise, privacy-sensitive and cost-conscious deployments thanks to its permissively licensed open models.