Z.ai’s GLM-5.3 is now available through an application programming interface, according to VentureBeat. The report says API access to the new language model is priced at $1.40 per million input tokens and $4.40 per million output tokens. Techmeme’s aggregation of the VentureBeat report adds that the pricing is unchanged from GLM-5.2. The cluster does not include independent confirmation from z.ai or another primary source, so the pricing should be treated as reported by VentureBeat. VentureBeat describes GLM-5.3 as a new frontier open-source language model from Chinese startup z.ai. The same summary says the model debuted last week and that its cyber capabilities reportedly found a previously undetected vulnerability in Cursor. That vulnerability claim remains reported, not independently corroborated in the provided material. The concrete change for developers is access: GLM-5.3 is no longer only a model launch or benchmark story in these reports, but a metered API product with published input and output token prices. For teams comparing model costs, the distinction between input and output token pricing matters because generation-heavy workloads pay more on the output side. The evidence base is narrow. Both items point back to VentureBeat, and Techmeme functions here as a distribution and summary layer rather than a second independent report. That is enough to track the launch as developing, but not enough to make broader claims about performance, adoption, security impact, or competitive positioning. Who benefits: Developers and AI teams evaluating GLM-5.3 get a concrete reported price: $1.40 per million input tokens and $4.40 per million output tokens. Z.ai benefits from making the model available through a standard consumption channel. Who's exposed: Competing model providers may face another low-friction option in developer evaluations, but the provided sources do not establish adoption or performance comparisons. Security-tooling teams should also treat the reported Cursor vulnerability claim as unverified within this cluster.