With the introduction of the fair use policy enforcement and changes to the Assistant pricing model, the unspent allotment should carry over to next period (possibly in limited capacity, or up to a certain time).
This is helpful for users who may want to utilize the Assistant in bursts rather than consistently, or occasionally process larger workloads. Features such as file input or website search can easily run up the amount of input tokens used, which while generally cheaper than output tokens still contribute to the cost. This makes the higher plans more attractive to such users, especially compared to strictly pay-per-token offerings of other providers.
