GLM-5.1

GLM-5.1 is a large language model released by Zhipu (also published under the zai-org and THUDM organization names) as part of the GLM-5 family. It sits as an incremental revision within that family rather than a separate line, and is distributed under identifiers such as zai-org/GLM-5.1 and THUDM/GLM-5.1, which are the names typically used by inference providers that host it. The main confirmed specification we track for GLM-5.1 is its 200,000-token context window, which is large enough to hold long documents, extended chat histories, or sizeable portions of a codebase in a single request. Zhipu's GLM series has historically been associated with bilingual Chinese and English usage, and GLM-5.1 is served through multiple third-party inference endpoints in addition to Zhipu's own API. Other attributes — throughput, latency, modality support, and tool-calling specifics — are not fully captured in our dataset, so they are best verified against the provider you plan to use. In practice, models in this class are used for long-context document work, coding assistance, and general assistant workloads where a wide context window reduces the need for aggressive chunking or retrieval engineering. Because GLM-5.1 is offered by several hosts, throughput and pricing can differ substantially between providers even for the same model weights; the pricing table on this page tracks the options we have collected.