GLM-5.3 Language Model Now Available on API at $1.4/$4.4 Per Million Tokens

Summary

Chinese startup z.ai has released its new open-source language model, GLM-5.3, to its API at the same pricing as its predecessor, GLM-5.2, costing $1.40 per million input tokens and $4.40 per million output tokens. This pricing positions GLM-5.3 as a more cost-effective option compared to many premium frontier models, despite its improved performance, tying Kimi K3 as a top-performing open-weights model.