GLM-5.2 is Z.AI’s flagship open-source large language model, engineered for long-horizon coding, agentic, and reasoning tasks. Designed for complex reasoning, advanced software engineering, and large-scale data processing, GLM-5.2 introduces a massive 1,048,576-token context window alongside significant architectural innovations.

Hosted on the DeepInfra platform, GLM-5.2 provides developers with a high-performance, OpenAI-compatible interface. Whether you are building agentic workflows, analyzing entire codebases, or processing lengthy documents, GLM-5.2 offers the stability and intelligence required for next-generation AI applications.

Architecture and Key Innovations

GLM-5.2 was released on June 13, 2026, succeeding GLM-5.1 in the GLM-5 family. Unlike previous iterations, this model is engineered to maintain output quality and stability even when the 1M-token context is fully utilized, allowing for the seamless processing of large datasets and complex, multi-file repositories in a single prompt.

IndexShare and MTP: To support this context window efficiently, Z-AI introduced IndexShare, a mechanism that reuses the same indexer across every four sparse attention layers, resulting in a reported 2.9x reduction in per-token FLOPs at maximum context length. An upgraded Multi-Token Prediction (MTP) layer also optimizes speculative decoding, increasing token acceptance length by up to 20% for faster, more cost-effective generation.

Flexible Reasoning: GLM-5.2 features a “Flexible Effort” system (High and Max modes) that lets users adjust the model’s thinking depth to balance reasoning performance against latency. Z.ai recommends the Max effort level for complex, multi-step tasks.

Open Access: GLM-5.2 is released under the MIT license, allowing unrestricted commercial use, modification, and self-hosting.

Performance Benchmarks

GLM-5.2 demonstrates strong performance across industry-standard evaluations, frequently rivaling or approaching proprietary models such as GPT-5.5 and Claude Opus 4.8.

Key Highlights

• Mathematical Excellence: With a 99.2 on AIME 2026, GLM-5.2 is among the top-performing models for competitive mathematics.
• Software Engineering: The model shows a substantial gain on FrontierSWE (74.4), trailing Claude Opus 4.8 (75.1) by roughly a point — a strong signal for navigating and resolving issues in complex codebases over long horizons.
• Agentic Orchestration: A score of 76.8 on MCP-Atlas reflects strong performance on tool-use and autonomous task execution.

Getting Started with the API

GLM-5.2 is accessible via DeepInfra’s OpenAI-compatible API, making integration straightforward for developers familiar with standard LLM tooling.

1. Authentication

Use your DeepInfra API key in the Authorization header:

Authorization: Bearer <YOUR_DEEPINFRA_API_KEY>

2. API Endpoint

• Base URL: https://api.deepinfra.com/v1/openai
• Endpoint: /chat/completions
• Method: POST

3. Making Your First Request

curl -X POST https://api.deepinfra.com/v1/openai/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $DEEPINFRA_API_KEY" \
  -d '{
    "model": "zai-org/GLM-5.2",
    "messages": [
      {
        "role": "user",
        "content": "Explain the concept of speculative decoding in 2 sentences."
      }
    ],
    "temperature": 0.7
copy

4. Common Parameters

Pricing and Tiers

DeepInfra offers a flexible, pay-per-token pricing model for GLM-5.2, with options for both standard and prioritized workloads.

The Priority Tier, available at 1.5× the standard rate, is designed for workloads requiring higher priority and faster processing.

While standard API access is usage-based, users with high-throughput requirements can deploy Private Endpoints via the DeepInfra Dashboard for dedicated capacity.

Conclusion

GLM-5.2 combines a massive 1M-token context window with strong reasoning and coding capabilities, supported by architectural innovations like IndexShare and a flexible reasoning system. It provides developers with the efficiency and power needed for complex agentic and long-horizon tasks.

• Unmatched Context: 1,048,576 tokens for massive data processing.
• Strong Performance: Top-tier scores in Math (AIME) and long-horizon coding (FrontierSWE).
• Developer Friendly: OpenAI-compatible API with support for JSON Mode and Function Calling.
• Permissive: MIT-licensed for unrestricted global use.

To begin building with GLM-5.2, visit the DeepInfra Dashboard to generate your API key and explore private deployment options.