Introducing Claude Opus 5
Simon Willison's Weblog 2 months ago 53 ● 17 sources
Anthropic released Claude Opus 5, a new large language model that leads the Artificial Analysis leaderboard and matches Claude Opus 4.8 in price. The model demonstrated the ability to independently write a computer vision pipeline to analyze machine drawings and reconstruct 3D models when direct image viewing was unavailable. Opus 5 improved at finding cybersecurity vulnerabilities through general capability gains rather than explicit training, while Anthropic deliberately avoided training it on exploitation techniques.