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Introducing Claude Opus 5.5
Opus 5.5 performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
The Situation Report
A rare strain of Ebola, with no confirmed vaccine, is spreading through the east of the Democratic Republic of Congo. World health organizations are using Claude to move as fast as possible to combat it.
Introducing Claude Fable 5.1 and Claude Mythos 5.1
Our most advanced models for coding and knowledge work. Their research capabilities also offer an early glimpse of how AI models will contribute to scientific progress.
Detecting and countering misuse of AI: September 2026
Over the past eight months, our Threat Intelligence team identified and disrupted operations in which threat actors tried to use Claude for malicious activity. In this report, we share case studies from those operations and describe how malicious use of Claude has evolved since our previous threat reports in 2025.
News
- Barclays scales Claude to upgrade operations and improve client experience
- Claude discovers a novel enzyme system with CRISPR-like repeats
- Partnering with Accenture on embedded evaluation
- Introducing the Life Sciences Verification Program
- Developing Enterprise Frontier Safeguards with our customers
- Improving our alignment and security efforts
- Previewing the Model Hardware Standard
- Expanding our support for scientists
- Funding better evaluations of AI’s impact on wellbeing
- How Claude’s text watermark works
