Your sovereign, private GLM 5.3 Fast

GLM-5.3 is Z.ai's flagship open-weights model (753B total, MoE with sparse+linear attention), sharing its base with GLM-5.2 while gaining substantially through post-training: it is the most capable open-weights coding model, with 50% gains over GLM-5.2 on Z.ai Code Bench, open-source SOTA on Terminal Bench 3.0, and state-of-the-art cyber capability on CyberGym. A 1M-token context and configurable reasoning effort (low/high/max) make it a strong pick for long-horizon agentic engineering. Served on the fast service tier. A reasoning model in the extra-large tier, served on ToothFairyAI's AU, EU and US endpoints — private by default, billed in Units of Intelligence at the published rates below. No training on your data, no vendor lock-in.