r/AI_Agents: Independent Builder Switches From OpenAI Codex $20/Month Flat Rate to OpenRouter — One Day Costs $150 as Provider Subsidy Era Ends

An agent developer running Hermes reports hitting OpenAI's weekly usage limit on a $20/month Codex subscription, then switching to OpenRouter for one day at a cost of $150 — a roughly 225x per-day spike. The thread is surfacing wide community documentation of 5–20x cost escalation when transitioning from bundled flat-rate subscriptions to pay-per-token APIs, with participants arguing that production agent workloads are economically unsustainable without explicit model routing, tier-selection logic, and spend-cap infrastructure at the harness layer.