Detecting and countering misuse of AI: September 2026

Introducing Claude Opus 5.5 Claude Opus 5.5 leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.

Oct 18, 2026 Investing in the public benefit We’re committing a portion of Anthropic’s shares to the Anthropic Public Benefit Fund, a new entity with a structure that increases the stake as the company grows. Announcements

Oct 6, 2026 Expanding the Cyber Verification Program We’re launching a new, expanded version of our Cyber Verification Program, which makes advanced cyber capabilities and reduced blocking classifiers available to qualifying security professionals.

Oct 7, 2026 Introducing Claude Haiku 5.5 Claude Haiku 5.5 is our fastest, most capable small model. Built for high-volume work like summarization, subagents, and browser use. Announcements

Sep 28, 2026 Introducing Claude Sonnet 5.5 Claude Sonnet 5.5 is a clear upgrade over Claude Sonnet 5, runs 30%+ faster, and costs up to 30% less for most work.