GLM-5.3-FlashX

TechFlow's September 18, 2026 newsletter reports Zhipu's official launch of GLM-5.3-FlashX, confirming the model was previously previewed to global developers under the codename "Ox Alpha." Zhipu stated the 200 tokens/s speed was achieved through increased infrastructure investment and inference optimization on a computing cluster backed by 100,000 domestically produced chips, with the FlashX API going live under the identifier "GLM-5.3-FlashX." The launch framing positions FlashX as combining intelligence, price, and speed simultaneously for the first time within the GLM-5 series. The article notes rapid prior adoption of the underlying GLM-5.3-Flash among global developers drove Zhipu to scale inference capacity, making FlashX a direct response to enterprise demand for higher-throughput, lower-latency access to the same model weights.

Z.ai's official developer documentation introduces GLM-5.3-FlashX as the high-speed variant of GLM-5.3-Flash, achieving inference speeds of up to 200 tokens/s on the same multimodal architecture. The model shares Flash's 320B total / 18B active parameters, hybrid sparse-plus-linear attention, 1M-token context window, and 128K maximum output, with API code "glm-5.3-flashx" available via the Chat Completion API. No new benchmarks were published because weights remain unchanged from Flash. The documentation positions FlashX alongside Flash on the GLM Coding Plan, emphasizing native multimodal visual coding, professional workflow support (Office, financial research, document processing), and recommended sampling settings of temperature 1, top_p 0.95, and reasoning_effort max. The FlashX-specific speed gain is delivered through inference optimization on Zhipu's domestic-chip infrastructure rather than capability changes, making it a serving-layer upgrade targeted at high-throughput, low-latency enterprise usage.