GLM-5.2 API Guide: Features, Pricing, and Use Cases in 2026

GLM-5.2 is Zhipu AI's latest language model — and it comes with a genuinely free tier. Here's everything you need to know.

GLM Model Family

The Free Tier: GLM-4.6V Flash

GLM-4.6V Flash is one of the only truly free LLM APIs available. No token limit, no time limit, no credit card required. Perfect for:

• Prototyping and testing
• Low-volume production apps
• Learning and education
• Hobby projects

How to Access GLM API

Register at NovAI and use the OpenAI-compatible API:

import openai

client = openai.OpenAI(
    api_key="sk-novai-your-key",
    base_url="https://aiapi-pro.com/v1"
)

# Free model:
response = client.chat.completions.create(
    model="glm-4.6v-flash",  # FREE
    messages=[{"role": "user", "content": "Hello!"}]
)

# Premium model:
response = client.chat.completions.create(
    model="glm-5.2",  # $0.50/$1.50 per 1M
    messages=[{"role": "user", "content": "Hello!"}]
)

FAQ

Is GLM-5.2 API free?

GLM-5.2 costs $0.50/1M input and $1.50/1M output tokens. However, GLM-4.6V Flash is completely free with no token limit through NovAI. This makes it one of the only truly free LLM APIs available — perfect for prototyping, testing, and low-volume production use.

How does GLM-5.2 compare to GPT-5.5?

GLM-5.2 scores 86.1% on MMLU vs GPT-5.5's 89.8%. While slightly behind on pure reasoning, GLM-5.2 costs 90% less ($0.50 vs $5.00 per 1M input tokens). For chat, content generation, and general tasks, GLM-5.2 is more than sufficient. For complex multi-step reasoning, GPT-5.5 has an edge.

What is GLM-4.6V Flash free tier?

GLM-4.6V Flash is a free model available through NovAI with no token limit and no credit card required. It supports 128K context and is suitable for testing, prototyping, education, and low-volume production use. It's one of the only genuinely free LLM APIs on the market.

How do I access GLM API without Chinese phone?

Use NovAI (aiapi-pro.com). Register with any email address, pay with USDT (TRC20), and access GLM-5.2, GLM-5V Turbo, and GLM-4.6V Flash through an OpenAI-compatible API. No Chinese phone or Alipay needed. $5 free credit on signup plus unlimited free GLM-4.6V Flash.

What is GLM-5V Turbo?

GLM-5V Turbo is Zhipu AI's vision-capable model, able to understand images alongside text. It costs $0.70/1M tokens for both input and output, with a 32K context window. It's suitable for image description, visual Q&A, OCR tasks, and multimodal applications. Available through NovAI alongside the text-only GLM models.