Claude is the AI assistant built by Anthropic, available as a chatbot on the web, desktop and mobile, and as a set of models that developers rent through an API. People use it to write, summarise, analyse, plan and code — and in 2026 it is one of the three or four assistants most of the industry benchmarks against.
What sets Claude apart is less any single feature than a combination: very large context windows, a careful conversational style, and a coding ability strong enough that its developer tool, Claude Code, became a business worth billions on its own.
The model family: Haiku, Sonnet and Opus
Claude is not one model but a family, organised by the trade-off between speed and capability. Haiku is the smallest and fastest, built for high-volume, quick-turnaround work. Sonnet sits in the middle and is the default for most users — smart enough for serious writing and coding, fast enough for everyday chat.
Opus is the flagship tier, aimed at the hardest reasoning, long documents and complex multi-step work. Anthropic has also added even more capable tiers above Opus for specialised customers, but for most readers the three-way split is the map that matters: pick Haiku for speed, Sonnet for balance, Opus when the task is genuinely hard.
Paid plans unlock more usage and the stronger models. An extended thinking mode lets Claude work through a problem step by step before answering, which visibly improves results on maths, logic and debugging.
What you can do with it
The everyday toolkit is broad. Claude writes and edits in a natural register, summarises long documents, extracts data from files, and works with uploads including PDFs, spreadsheets and images. It can search the web for current information and cite what it finds.
Two features deserve specific mention. Projects let you gather chats and reference files into a persistent workspace, so Claude answers with your documents in mind. Artifacts turn a conversation into a living object: ask for a table, a chart, a web page or a small app, and Claude builds it in a side panel you can copy, download or keep editing.
Claude also connects outward. Through connectors and the Model Context Protocol, it can work with tools and data sources beyond the chat window, and it can run code in a sandbox to produce real files — spreadsheets, presentations and documents — rather than just describing them.
Working style: why people describe Claude differently
Ask regular users what distinguishes Claude and they rarely name a feature. They describe a manner: it writes in a measured, natural register, qualifies when it is unsure, and handles long, messy source material without losing the thread. Editors and analysts adopted it early for exactly those traits.
Part of that is context. Claude’s large context windows let you hand it a book-length document, a codebase or a year of meeting notes and ask questions across the whole of it. Combined with Projects, which keep reference material attached to a workspace, the assistant behaves less like a search box and more like a colleague who has read the file.
Memory features extend the effect: Claude can retain preferences and facts you choose to share, so recurring work starts from context instead of a blank prompt. As with every assistant, that convenience deserves an occasional audit of what has been remembered.
The limits are the familiar ones. Claude can still be confidently wrong, its refusals occasionally misfire on legitimate requests, and allowances vary sharply by plan. But its centre of gravity — long documents, careful prose, serious code — is the clearest identity any frontier assistant has.
Where Claude lives
For consumers, Claude lives in its apps, with free and paid tiers. For developers, the same models are available through the Anthropic API and through Amazon Bedrock and Google Cloud, which is how Claude ends up inside thousands of other products without users ever seeing its name.
And then there is Claude Code, the terminal-based agent that reads a codebase, plans changes, edits files and runs tests. It is included in paid Claude plans and passed a $2.5 billion revenue run-rate in February 2026 — evidence that for a growing share of users, “using Claude” means delegating work to it, not just chatting.
The one-line summary: Claude is a general-purpose assistant with a writer’s temperament and an engineer’s streak. If your work is text, documents and code, it is built for exactly that.
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