Anthropic Claude Opus 5 Rivals Fable 5 at Half the Price

Anthropic has released Claude Opus 5, an upgraded LLM that approaches the performance of Fable 5 at roughly half the running cost, improving knowledge work, coding, and scientific tasks; the company relaxed some safety interventions (reporting ~85% fewer classifier actions), did not apply specialized cyber-offensive training, added an "Effort" setting for tradeoffs between thoroughness and token use, and kept lower pricing compared with Fable 5. The article is an informational product announcement and does not describe an active cyber incident.