Claude September recap: Chat and Cowork merge, Claude 5.5 models ship

Claude's September update merges Chat and Cowork and ships the Claude 5.5 model series, supporting documents, presentations and design work inside a conversation. Tasks run in the cloud and keep going after the laptop is closed, and Claude Docs lets teams edit in the same document as Claude.

Why it matters: Claude merges Chat and Cowork and keeps tasks running in the cloud, so work no longer stops when a laptop closes and teams can edit alongside Claude.