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-5.1Z.AIReleased April 7, 2026
GLM-5.1
Engineered for long-horizon tasks, able to work independently for up to 8 hours in a single run, aligned with Claude Opus 4.6.
reasoning-llmProprietary API$1.40 / 1M tok (8h Autonomous Agent)Context: 200K (200,000 tokens)Arena ELO: 1465
Technical Specifications
Architecture Type
Long-Horizon Autonomous Engineering Transformer
Total Parameters
Fifth-Gen Scale
Context Window
200K (200,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
March 2026
Supported Modalities
text, code, reasoning
License & Access
Z.AI Terms of Service
Benchmark Evaluations
Mmlu Pro
86.8
Humaneval
96
Swe Bench Verified
74.5
Chatbot Arena ELO
1465
Deep Architectural Overview
GLM-5.1 enables a closed loop from planning and execution to iterative refinement and final delivery. Built with multi-turn SFT and reinforcement learning with process-quality evaluation, it maintains remarkable goal consistency over 8-hour autonomous runs.
Strengths & Considerations
Core Strengths
- Sustained 8-hour autonomous single-task execution
- Comprehensive alignment with Claude Opus 4.6
- 128k maximum generation output tokens
Known Limitations
- Succeeded by GLM-5.2 for 1M token context windows
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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