Claude 4: a new generation of coding assistants

Anthropic introduced Claude Opus 4 and Claude Sonnet 4, positioning the pair around coding, reasoning, and agent workflows.

The practical question for a developer is how a model behaves across a whole task: reading a repository, making a change, running checks, and responding to feedback. A benchmark is one input, not the entire evaluation.

This is a historical launch example, not a recommendation about today’s model lineup.