---
id: "z-ai/glm-5.3-flashx"
also: ["z-ai/glm-5.3-flashx-20260918", "requesty/zai/glm-5.3-flashx", "vercel/zai/glm-5.3-flashx"]
card_usd_per_m: "0.37 in, 1.25 out, at z-ai/fp8"
cheapest_list_usd_per_m: "0.37 in, 1.25 out, at z-ai/fp8 on openrouter"
cheapest_effective_usd_per_m: "0.1056 in, 1.25 out, at tencent on requesty"
context: 1048576
max_output: 131072
input: ["text", "image", "video"]
output: ["text"]
released: "2026-09-18"
reasoning: ["max", "high", "low"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_tokens", "reasoning", "reasoning_effort", "response_format", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "top_k", "top_p"]
endpoints: 3
gateways: "openrouter (1), requesty (1), vercel (1)"
no_training: 2
trains: 0
retains_prompts: 1
---
# Z.ai: GLM 5.3 FlashX

GLM-5.3-FlashX is the high-speed serving option for Z.ai’s native multimodal coding model, featuring 320B total parameters, 18B activated parameters, and a 1M-token context window. Its efficient hybrid attention architecture supports visual coding, tool use, and end-to-end professional workflows across code, browsers, documents, and graphical interfaces.