Opus 5: Cheaper AI coding power raises new security and budgeting questions

Anthropic's Opus 5 delivers state-of-the-art coding performance for just $5 per million input tokens and $25 per million output tokens, outperforming Fable 5 on benchmarks and enabling longer autonomous tasks. However, the lower running cost intensifies concerns about security, spend management, and oversight for agentic AI, prompting a shift toward short-lived credentials, microVM isolation, and smarter telemetry; operators may route unsafe tasks to Opus 4.8 via Automatic Fallbacks, while balancing biology tasks and long-horizon workflows.