What’s the cost of Anthropic API during the course?

Tiny. ~$5/week of cohort study time, billed directly by Anthropic. Most students use Claude Pro at $20/month for unlimited (rate-limited) usage — that’s the cheapest path. Heavy users (running sub-agents on big repos) might prefer Claude API at $3/$15 per million tokens, with prompt caching enabled to drop input cost by 90%. Total over the 4-week cohort: $20 (Claude Pro) or $30–50 (API) typical. Worth pointing out: you save ~$200 in API costs by using prompt caching — module 1 covers exactly how.