GLM 5.3🔒Private

• 🔒 Runs inside a Trusted Execution Environment with hardware attestation evidence
• 🏢 Z.ai's flagship GLM text model, listed with a September 2026 release date
• 📏 1M-token context window for long documents and extended agent runs
• 🧠 Catalog capabilities include reasoning and code-optimized generation
• 🔧 Function calling and web search support agentic, tool-using workflows
• ⚡ Sibling GLM 5.3 Flash is offered as the lighter-weight option
• 💬 Text in, text out — no image or audio input
• 📚 Distributed under a custom Z.ai license rather than a standard open one

Z.ai

Z.ai, formally Knowledge Atlas Technology Joint Stock Co., Ltd., is a Chinese technology company specializing in artificial intelligence. Previously known internationally as Zhipu AI, the company rebranded to Z.ai in 2025. Its core focus is the GLM family of…

GLM 5.3 is Z.ai's flagship large language model offered here in a privacy-hardened deployment. According to the catalog record, the model runs inside a Trusted Execution Environment, and hardware attestation evidence is published so callers can independently verify the enclave's identity and configuration before sending data. Functionally it corresponds to the standard GLM 5.3 endpoint, with reasoning, code-oriented generation, function calling and web search among its listed capabilities.

Compared with its same-family predecessor, GLM 5.2, this entry is the newer 5.3 generation in the confidential-compute line, released roughly three months later. Both are text-only and carry a one-million-token context window; the catalog does not publish parameter counts or quantization details for either, and no verified benchmark figures are available for citation here.

This entry is listed under a custom Z.ai license rather than a standard open-source one. Related entries in the catalog include GLM 5.3 Flash for lighter workloads, plus earlier generations such as GLM 5.1 and GLM 5.

Choose this variant when you need a very long context together with attestable confidentiality; choose a non-TEE sibling if attestation is not a requirement.