When was GLM-5.3-Flash released?

Z.ai released GLM-5.3-Flash on 26 Aug 2026. It is available through the Opper gateway.

Does GLM-5.3-Flash support zero data retention?

Yes. GLM-5.3-Flash is available with zero data retention by default on Novita through the Opper gateway.

Where is GLM-5.3-Flash hosted?

GLM-5.3-Flash runs on US hosting routes through the Opper gateway.

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

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

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

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

GLM-5.3-Flash

by Z.ai

Released 71 days after GLM-5.2 · All Z.ai releases

GLM-5.3-Flash is a natively multimodal model from Z.ai with 320B total / 18B active parameters. Its hybrid sparse-and-linear attention architecture keeps long-context behaviour accurate while cutting compute overhead, and it targets efficient coding and long-horizon agent tasks.

Open in playground Try in chat Compare

Key info

Input

Output

Features

Context window

Max output

131K

Input price

$0.15 /1M

Output price

$0.50 /1M

Released

26 Aug 2026

US residency available
Zero data retention on pay-as-you-go
No training by default
GDPR DPA available

Available routes

GLM-5.3-Flash runs on 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output
Novita	US	Zero data retention	No	$0.15	$0.50

Uptime and availability

GLM-5.3-Flash runs on a single route through the Opper gateway today, so its availability is that provider's availability.

100%route uptime, last 30 days

Single route, no failover target within this model.

Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

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

Novita — United States🇺🇸

Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. US; SCCs; DPA available.

Zero data retention: On by default on Pay-as-you-go.
Training: No training on customer data.
Logging: None
Third-party access: Provider may share with subprocessors / partners
GDPR DPA: DPA available
Transfer mechanism: SCCs

Benchmarks

Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#15 of 608 LLMs

TierFrontier

Output speed42 tok/s

First token1.16s

Intelligence Index57.5

Coding Index71.5

Reasoning & knowledge

GPQA Diamond

91%

Humanity's Last Exam

40%

Long-context reasoning

78%

Coding

SciCode

46%

See full leaderboard →Benchmarks via Artificial Analysis · View on AA

Get started

Call GLM-5.3-Flash through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.

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: "novita/zai-org/glm-5.3-flash",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);