Your agent bill has an arbitrage in it: a three-tier audit

As AI model pricing becomes increasingly volatile, developers are facing significant cost inefficiencies by relying on flagship models for all tasks. A new audit framework suggests categorizing workloads into three tiers: T1 (bulk/batchable), T2 (interactive), and T3 (regulated). By comparing costs across these tiers—ranging from expensive flagship models to cost-effective open-weight alternatives—organizations can identify substantial savings. The audit emphasizes that while moving from flagship to cheaper models offers the most immediate financial relief, developers must account for hidden costs like hosting, promo cliffs, and usage caps. The author introduces 'OpenArb,' a toolkit designed to help teams perform this audit, implement a four-stage migration runbook, and enforce routing policies to ensure that quality gates are maintained. Ultimately, the article warns that pricing is a moving target, requiring constant vigilance and rigorous evaluation before migrating production workloads to cheaper alternatives.