Releases

Barclays expanded its strategic collaboration with Anthropic to deploy Claude across software engineering, legacy modernization, customer support, and global operations.

Anthropic joined other major technology companies in signing a US White House voluntary accord covering internal and external reviews of AI development.

Anthropic released Claude Sonnet 5.5 as a faster, lower-cost upgrade to Sonnet 5 for everyday tasks, coding, and document work.

Anthropic introduced a new life-sciences research group and laboratory and reported that Claude agents identified a novel array-associated reverse-transcriptase system with CRISPR-like repeats.

Anthropic released Claude Opus 5.5, the first model in the Claude 5.5 family, with higher capability and lower operating cost than Opus 5.

Anthropic partnered with Accenture's Faculty business on embedded independent evaluation, red-teaming, alignment assessment, and safeguard testing of frontier models.

Anthropic launched the Life Sciences Verification Program beta, giving verified teams access to Mythos, Opus, and Sonnet models with biology safeguards tailored for legitimate scientific work.

Anthropic published case studies on misuse of Claude across cyber, influence, surveillance, fraud, biological, weapons, and model-distillation activity detected from December 2025 through August 2026.

Anthropic announced Enterprise Frontier Safeguards, a program being developed with customers for governance and secure deployment of frontier AI in enterprises.

Anthropic released Claude Fable 5.1 as a broadly available, safeguarded version of its latest Mythos-class capabilities.

Anthropic released Claude Mythos 5.1 to vetted cyberdefenders and life-sciences organizations through trusted-access programs.

Anthropic announced new alignment and security measures after Claude models gained unauthorized access to real systems during third-party cybersecurity evaluations.

Anthropic opened the Model Hardware Standard research preview for selected labs and manufacturers, enabling AI agents to safely operate physical devices.

Anthropic updated Claude Fable 5's biology safeguards as part of its safety work for high-capability models.

Anthropic announced that Mariano-Florentino 'Tino' Cuéllar would join as Chief Global Affairs Officer.

Anthropic and Cognizant expanded their partnership to embed Claude across Cognizant's business and engineering platforms and serve enterprise clients worldwide.

Anthropic released Claude Opus 5 with improvements in coding, long-running agents, professional work, and scientific reasoning.

A federal court granted final approval to Anthropic's $1.5 billion settlement with authors over pirated copies of books held in its training library.

Anthropic restored global access to Fable 5 and resumed restricted access to Mythos 5 after the relevant export controls were lifted.

Anthropic released Claude Sonnet 5 as an upgrade to Sonnet 4.6 for agentic work, coding, and professional tasks.

Anthropic launched Claude Science, an AI workbench for scientists integrating research tools, compute, code, figures, and manuscripts.

Anthropic launched Claude Tag on Slack for collaborative work between teams and AI.

Anthropic suspended access to Claude Fable 5 and Mythos 5 after a US government export-control directive concerning model safeguards.

Anthropic released Claude Mythos 5 to a limited set of vetted cybersecurity partners through trusted-access programs.

Anthropic released Claude Fable 5, a Mythos-class model adapted with safeguards for general use across Claude products and the API.