Cost & Rate Limits — CodexHow

Everything about keeping a Codex habit affordable and predictable: reading the usage object a request actually returns, picking a service tier for a given workload, budgeting a CI pipeline that calls Codex on every commit, and staying on the right side of the long-context repricing cliff instead of finding out about it on an invoice. Paired with the tools section for the parts that are better computed than read.

If you only read one guide here, make it the long-context one — it's the single most common way a Codex bill surprises someone who otherwise budgeted carefully, and the fix is almost always a workflow change, not a config flag.