Z.AI
Ultra-low latency version of GLM-5.3-Flash engineered for high-concurrency real-time IDE code completion and interactive agents.
200K ctx$0.37 / 1M tok (Ultra-Low Latency MoE)
Introducing GLM-5.3Z.AIReleased August 18, 2026
GLM-5.3
Z.AI’s premier flagship model, delivering a 50% performance gain on Code Bench and matching Claude Mythos 5 in cybersecurity and vulnerability discovery.
reasoning-llmProprietary API$1.40 / 1M tok (Flagship Coding & Cyber)Context: 1M (1,000,000 tokens)Arena ELO: 1530
Technical Specifications
Architecture Type
Frontier Post-Trained Agentic Transformer
Total Parameters
Fifth-Gen Scale
Context Window
1M (1,000,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
July 2026
Supported Modalities
text, code, reasoning
License & Access
Z.AI Terms of Service
Benchmark Evaluations
Mmlu Pro
91.2
Humaneval
98.6
Cybergym Score
91.4
Swe Bench Verified
83.6
Chatbot Arena ELO
1530
Deep Architectural Overview
GLM-5.3 represents Z.AI’s most powerful foundation model. Built with advanced test-time compute and post-training scaling, it reaches SOTA performance among open models on Terminal Bench 3.0, Agents’ Last Exam, and CyberGym vulnerability analysis with 1M context.
Strengths & Considerations
Core Strengths
- 50% coding performance gain over GLM-5.2
- Emergent cybersecurity capabilities matching Claude Mythos 5
- 1M context window and 128k output buffer with streaming tool calls
Known Limitations
- High compute requirements during deep thinking mode (`reasoning_effort=max`)
Token & API Pricing
Input Tokens (1M)$1.40
Output Tokens (1M)$4.40
Cached Input (1M)$0.2600
Pricing is verified directly against Z.AI's developer documentation and API rate sheets.
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