Claude AI is the family of large language models built by Anthropic, and in 2026 it is one of the two or three most capable AI systems you can actually use. The current flagship, Claude Opus 5, launched July 24, 2026 and went straight to first place on the Artificial Analysis Intelligence Index with a score of 61, and the value tier, Claude Sonnet 5, brings near-flagship quality down to $2 per million input tokens. Claude is known for careful reasoning, strong coding, a huge 1 million token context window, and a safety-first design its maker calls Constitutional AI. This guide is the plain-English tour of everything that matters about […]