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Access the GLM-4 API via Zhipu BigModel: Real Signup (Not Wrapper Sites)

Zhipu AI's GLM-4 family is one of the cheapest Chinese LLMs per token. How to access it from abroad — real portal URL, signup flow, payment workarounds.

Fan Chuanyu's profile

Written by Fan Chuanyu

•2 min read

Zhipu AI's GLM-4 family runs on one of the lowest per-token price points in the Chinese LLM field — GLM-4-Air at $0.07 per 1M tokens (bidirectional). That price ceiling attracts buyers who then get sent to a wrapper site that charges 5× as much. Here's how to reach the real Zhipu platform instead.

What is GLM-4 / Zhipu

Zhipu AI (BigModel) operates the GLM-4 foundation model family:

  • GLM-4-Plus — the flagship closed model
  • GLM-4-Air — cost-efficient tier, $0.07/1M bidirectional

Spun out of Tsinghua University's KEG Lab; known for strong bilingual Chinese/English performance and a generous open-weight research track.

The real official URL

https://open.bigmodel.cn — verified per our Zhipu Provider Profile. The domain is ICP-filed under Zhipu's corporate entity. Registered 2019.

Unlike Moonshot (platform.moonshot.cn) and DeepSeek (platform.deepseek.com), Zhipu's domain is open.bigmodel.cn — a name that many wrapper sites try to imitate with variants like glm4-api.com, zhipu-ai.io, etc.

Signup walkthrough

  1. Go to open.bigmodel.cn.
  2. Register. The UI is Chinese-only; install Immersive Translate before starting.
  3. Complete 实名认证 (identity verification) — overseas users can submit passport for overseas-ID verification.
  4. Top up via Alipay. See the toolkit payment section for Wise as the international path.
  5. API Keys → create.
  6. First call — GLM-4 is OpenAI-compatible at a non-/v1 path: 
    curl https://open.bigmodel.cn/api/paas/v4/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "glm-4-plus", "messages": [{"role": "user", "content": "Hello"}]}'

Wrapper vs. real Zhipu

Telltales:

  • Any hostname not at open.bigmodel.cn or bigmodel.cn — real Zhipu does not franchise
  • Charges per-conversation instead of per-token (Zhipu publishes per-1M-token rates; see /pricing/ for the live matrix)
  • Zhipu's Chinese branding is distinctive — any site that is branded purely in English without the 智谱 / BigModel names is almost certainly a wrapper

Price positioning

GLM-4-Air at $0.07 / $0.07 per 1M tokens is extremely cheap — roughly 1/4 of DeepSeek V3 blended and 1/30 of GPT-4o. The tradeoff is quality: Air is a distilled version of GLM-4-Plus, fine for chat and summarization but not the strongest coding or reasoning performer.

For high-volume chat, GLM-4-Air is best-in-class. For reasoning, step up to GLM-4-Plus (~$7/1M) or go to DeepSeek R1 for extended reasoning-mode.

See /compare/deepseek-vs-zhipu/ for the head-to-head, and /model/compare/glm-4-air-vs-yi-lightning/ for cost-efficient Chinese tier comparison.

Reliability

Zhipu's endpoints are mainland-hosted. Latency from US/EU is 400-700ms TTFB. For production workloads put Cloudflare AI Gateway in front.

Summary

Real URL: open.bigmodel.cn. Translator required for the console. Wise → Alipay for international top-up. See the Zhipu Provider Profile for ICP + verification timestamp.

Last updated: 2026-04-22. Zhipu URLs + pricing verified same day.

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