Does GLM-5.3-FlashX support zero data retention?

No. The routes serving GLM-5.3-FlashX retain content; see the per-route data-handling section for each route's logging stance and retention window.

Where is GLM-5.3-FlashX hosted?

See the per-route table for GLM-5.3-FlashX hosting locations and residency details.

Is GLM-5.3-FlashX trained on prompts and outputs?

No. Every hosting route for GLM-5.3-FlashX is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for GLM-5.3-FlashX?

Yes. A GDPR Data Processing Agreement is available on at least one route serving GLM-5.3-FlashX. Contact hello@opper.ai to receive it.

GLM-5.3-FlashX

by Z.ai

GLM-5.3-FlashX is a faster serving tier of Z.ai's GLM-5.3-Flash. It uses the same model, a mixture-of-experts design with 320B total and 18B active parameters, with infrastructure and inference optimizations that reach generation speeds of up to 200 tokens per second. Like GLM-5.3-Flash, it is the first native multimodal model in the GLM-5 series. It takes text, images, video and files as input and returns text, and its hybrid architecture combines sparse and linear attention to cut attention compute and KV-cache cost. It supports a 1M-token context window and up to 128K output tokens. FlashX suits cases where response time compounds: interactive coding agents, tool-calling loops, visual coding and user-facing assistants. Where raw speed matters less, GLM-5.3-Flash offers the same capabilities, and GLM-5.3 remains the series flagship.

Call GLM-5.3-FlashX on Opper with the OpenAI SDK. Sign up without a credit card. Get started

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Key info

Input

Output

Features

Context window

Max output

131K

Input price

$0.37 /1M$0.07 cache read

Output price

$1.25 /1M

No training by default
GDPR DPA available

Available routes

GLM-5.3-FlashX runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Tencent Cloud	Multi		No	$0.37	$1.25	$0.07

Data handling per route

Each route hosting GLM-5.3-FlashX has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Tencent Cloud — Multi-region

Content is retained: limited debug logs, 30-day retention. No training on customer data. GLOBAL; SCCs; DPA available.

Zero data retention: Retained: limited debug logs, 30-day retention.
Training: No training on customer data.
Logging: Limited debug logs (30-day retention)
Abuse monitoring: On by default, holds flagged content
Caching: Content cached for replay
GDPR DPA: DPA available
Transfer mechanism: SCCs

Get started

Call GLM-5.3-FlashX through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

GLM-5.3-FlashX is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

1import OpenAI from "openai";
2
3const client = new OpenAI({
4  apiKey: process.env.OPPER_API_KEY,
5  baseURL: "https://api.opper.ai/v3/compat",
6});
7
8const completion = await client.chat.completions.create({
9  model: "tencent:sg/glm-5.3-flashx",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);