When to Choose Each Option
Clear guidance based on your specific situation and needs.
Our Recommendation
This isn't either/or — it's a layering decision. Use Claude Code /loop when each iteration needs judgment: triaging changing inputs, retrying with a different approach, or grinding a well-scoped optimization the way Karpathy's overnight loops do. Use cron jobs when the work is deterministic and reliability plus cost dominate: backups, syncs, fixed reports, health checks that must fire on time whether or not an LLM is available. The June 15 billing change makes the cost axis concrete — AI loops now bill at full API rates from a separate pool, so reserve reasoning for the steps that actually need it and let cron carry the deterministic backbone. The strongest setups wrap a thin cron schedule around a /loop that only invokes the model when a step genuinely requires reasoning.
- Choose Claude Code /loop when...
- Each iteration needs judgment — triage, classification or a different retry strategy
- You're running an optimization loop that should improve a measurable metric over time
- Inputs are messy or variable and a fixed command would be too brittle
- The task benefits from multi-step reasoning, planning or self-correction per cycle
- Choose Cron Jobs when...
- The work is deterministic — backups, syncs, fixed reports, health checks
- Reliability and on-time firing matter more than adaptive reasoning
- You want near-zero, predictable cost, especially after the June 15 billing change
- You need a persistent, infrastructure-grade schedule independent of any LLM session