We Slashed Our Claude API Bill by 80%: The Agency Playbook for Engineering AI Learn how our agency cut Claude Code API costs by up to 80% and improved code quality across 10 real engineering tasks by using strict rules in CLAUDE.md. By Anwar Sheikh, Co-Founder of OutGrow. Published March 15, 2026. Tags: AI, Claude Code, Cost Optimization, Prompt Engineering, Software Development, Agency Workflow. Read the full article at https://www.letsoutgrow.com/blog/slash-claude-api-costs-80-percent-improve-quality.