by Z.AI
GLM-5.2-Fast-Preview is the high-speed version of Zhipu AI’s flagship model GLM-5.2, supporting a 1M ultra-long context. The model’s capabilities are aligned with the GLM-5.2 standard version, offering logical reasoning, long-text understanding, and code generation. Through inference acceleration optimizations, output TPS can reach 1.5–2× that of the GLM-5.2 standard version, significantly improving output speed. It is suitable for scenarios sensitive to output speed, such as real-time dialogue, multi-turn Agent calls, and streaming code generation.
GLM-5.2-Fast-Preview is the high-speed version of Zhipu AI’s flagship model GLM-5.2, supporting a 1M ultra-long context. The model’s capabilities are aligned with the GLM-5.2 standard version, offering logical reasoning, long-text understanding, and code generation. Through inference acceleration optimizations, output TPS can reach 1.5–2× that of the GLM-5.2 standard version, significantly improving output speed. It is suitable for scenarios sensitive to output speed, such as real-time dialogue, multi-turn Agent calls, and streaming code generation.
glm-5.2-fast-preview has a 1,000,000 token context window.
On AIHubMix, glm-5.2-fast-preview costs $2.25 per million input tokens and $7.89 per million output tokens. Cached input reads are billed at $0.56 per million tokens.
glm-5.2-fast-preview accepts text input.
glm-5.2-fast-preview supports thinking, tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
glm-5.2-fast-preview is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to glm-5.2-fast-preview — no other code changes needed.
glm-5.2-fast-preview is developed by Z.AI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
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Use glm-5.2-fast-preview via the AIHubMix unified API — one interface for every major LLM.