Overview Claude is Anthropic's AI assistant — the frontier chatbot most technical operators quietly consider the sharpest of the three market leaders in 2026. Anthropic was founded in 2021 by former OpenAI research leads, launched Claude publicly in March 2023, and has since shipped iterations at a fast enough pace that the model powering claude.ai today (Sonnet 4.5 and Opus 4.7) bears only architectural resemblance to the 2023 original. The one line positioning: Claude is the assistant you pick when the output quality of a single response matters more than the surrounding ecosystem. It is not a photo generator. It has no video model. Voice mode exists but is basic. What Claude does — better than any other frontier assistant — is think, write, and code. Ask ChatGPT for a 1,500 word essay on a technical topic and you'll get something you have to rewrite. Ask Claude and you'll get something you have to trim. That difference compounds over months. Under the hood, Claude runs on two models most users interact with: Sonnet 4.5 as the fast, capable default for daily work, and Opus 4.7 as the slower, more deliberate model reserved for hard reasoning, careful writing, and heavy code. Both share a 1M token context window on the Pro tier — enough to hold an entire book, a mid sized codebase, or a five hour meeting transcript in memory at once. Claude's audience skews technical: solo founders, engineers, researchers, technical writers, and anyone whose output is measured by how…