GLM-5.2 is Z.ai's flagship GLM-5 series model, a 744-billion-parameter mixture-of-experts system with 40 billion active parameters, built for agentic engineering and long-horizon coding, with open weights published on Hugging Face. Its standout capability is a 1M-token context window, a roughly fivefold jump over the GLM-5.1 generation's 200K, letting it reason across entire repositories, long plan-then-execute traces, and book-length inputs in a single pass. The model introduces IndexShare, a sparse-attention design that reuses one indexer across every four attention layers, which Z.ai reports cuts per-token compute by 2.9 times at full 1M context while preserving long-range recall. Selectable thinking-effort levels, High and Max, let developers trade reasoning depth against latency, and Z.ai's own benchmarks put it at 62.1 on SWE-bench Pro, up from 58.4 for GLM-5.1. Released under an MIT license, GLM-5.2 suits developers building coding agents, repository-scale tools, and reasoning-intensive applications who want frontier capability with downloadable, self-hostable weights.
GLM-5.2 runs on 6 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.
Training posture across routes: No training on prompts by default.
Each route hosting GLM-5.2 has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; unknown.
Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. EU; DPA available.
Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call GLM-5.2 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.
Copy this and paste it into your coding agent — Claude Code, Cursor, Codex, and more — and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.click/v3/compat",});const completion = await client.chat.completions.create({model: "berget/zai-org/GLM-5.2",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
