glm-5.2-fast-preview · 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) has a 1,000,000 token context window. It supports up to 131,072 output tokens.
On AIHubMix, GLM 5.2 (fast) costs $2.254 per million input tokens and $7.889 per million output tokens. Cached input reads are billed at $0.564 per million tokens.
GLM 5.2 (fast) accepts text input.
GLM 5.2 (fast) 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) 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) is developed by Z.AI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
GLM 5.2 (fast) was released on June 16, 2026 by Z.AI.
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