OpenRouter: Z.ai: GLM 5.3 FlashX (OpenRouter)

Name: Z.ai: GLM 5.3 FlashX (OpenRouter) API
Brand: Zai

Newstable

Z.ai: GLM 5.3 FlashX (OpenRouter) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

z-ai-glm-5.3-flashxz-aireleased Sep 18, 2026

Provider Quick start

Context

1.0M

tokens

Max output

131.1K

tokens

Input

$0.37

per 1M

Output

$1.25

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

OpenRouter

1.0M$0.37$1.25

Pricing

Item	Price	Unit
Input	$0.37	per 1M tokens
Output	$1.25	per 1M tokens
Cache read	$0.090	per 1M tokens

Performance

Reliability

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Capabilities

Modalities

Input

Output

Details

Model ID: z-ai-glm-5.3-flashx
Family: z-ai
Status: stable
Knowledge: -
Released: Sep 18, 2026

Gateway Config

API: 2024-01-01
Auth: OPENROUTER_API_KEY
Discovery: dynamic
Provider type: meta

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@openrouter/z-ai-glm-5.3-flashx",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://openrouter.ai/api/v1

Chat completions

https://openrouter.ai/api/v1/chat/completions

Model

z-ai-glm-5.3-flashx

Auth env

OPENROUTER_API_KEY

Z.ai: GLM 5.3 FlashX (OpenRouter) FAQ

How much does the Z.ai: GLM 5.3 FlashX (OpenRouter) API cost?

Through OpenRouter, Z.ai: GLM 5.3 FlashX (OpenRouter) costs $0.37 per 1M input tokens and $1.25 per 1M output tokens.

What is the context window of Z.ai: GLM 5.3 FlashX (OpenRouter)?

Z.ai: GLM 5.3 FlashX (OpenRouter) accepts up to 1.0M tokens of context and returns up to 131.1K output tokens on OpenRouter.

What can Z.ai: GLM 5.3 FlashX (OpenRouter) do?

Z.ai: GLM 5.3 FlashX (OpenRouter) supports chat, function calling, image input and reasoning. It accepts text, image and video input.

How do I call Z.ai: GLM 5.3 FlashX (OpenRouter) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @openrouter/z-ai-glm-5.3-flashx. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.