---
id: "z-ai/glm-5.3-prime"
also: ["z-ai/glm-5.3-prime-20260921"]
cheapest_list_usd_per_m: "2.8 in, 8.8 out, at alibaba on openrouter"
cheapest_effective_usd_per_m: "0.7247 in, 8.7992 out, at alibaba on openrouter"
context: 1000000
max_output: 131072
input: ["text"]
output: ["text"]
released: "2026-09-23"
reasoning: ["max", "high", "low"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["frequency_penalty", "include_reasoning", "logprobs", "max_tokens", "presence_penalty", "reasoning", "reasoning_effort", "response_format", "seed", "stop", "temperature", "tool_choice", "tools", "top_k", "top_logprobs", "top_p"]
endpoints: 1
gateways: "openrouter (1)"
no_training: 1
trains: 0
retains_prompts: 1
---
# Z.ai: GLM 5.3 Prime

GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration. It supports text input and output with a 1M-token...