Agent Mag
SUBSCRIBE
GLM 5.1
All models
Z.aiZ.aiGLMReleased 2026-04-07

GLM 5.1

203K context$1.05/M input$3.50/M output

GLM-5.1 is an advanced AI model designed for long-horizon tasks, capable of autonomously planning, executing, and improving itself over extended periods of up to 8 hours. It excels in coding capabilities and delivers engineering-grade results, making it suitable for complex and persistent workflows. The model supports a large context window of 202,752 tokens, enabling detailed and structured outputs.

What is GLM 5.1?

GLM 5.1 is an AI model from Z.ai that Agent Mag tracks for pricing, context window, modalities, benchmarks, and API compatibility. Builders can use this page to compare GLM 5.1 against other models for agent workflows and production deployments.

Model ID

GLM-5.1 is an advanced AI model designed for long-horizon tasks, capable of autonomously planning, executing, and improving itself over extended periods of up to 8 hours. It excels in coding capabilities and delivers engineering-grade results, making it suitable for complex and persistent workflows. The model supports a large context window of 202,752 tokens, enabling detailed and structured outputs.

Architecture & Specifications
Tokenizer
Other
Released
2026-04-07
Modalities
Input
text
Output
text
Supported Parameters
frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokensmin_pparallel_tool_callspresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p
Strengths
  • Exceptional coding capabilities
  • Handles long-horizon tasks autonomously
  • Supports large context windows (202,752 tokens)
  • Structured output generation
  • Engineering-grade task execution
Limitations
  • High hallucination rate (70.6%) in knowledge-based tasks
  • Limited accuracy in research-level physics reasoning (4.6%)
  • Lower performance in general knowledge benchmarks
  • Potentially high computational costs for extended tasks
  • Dependence on developer moderation for prompt handling
Recommended Use Cases
Long-duration autonomous task execution
Complex coding workflows
Scientific reasoning and analysis
Legal document processing
Marketing strategy development

More from Z.ai

GLM 5V Turbo
203K ctx$1.20/M

GLM-5V-Turbo is Z.ai’s first native multimodal agent foundation model, built for vision-based coding and agent-driven tasks. It natively handles image, video, and text inputs, excels at long-horizon planning, complex coding,...

GLM 5 Turbo
203K ctx$1.20/M

GLM-5 Turbo is a new model from Z.ai designed for fast inference and strong performance in agent-driven environments such as OpenClaw scenarios. It is deeply optimized for real-world agent workflows...

GLM 5
203K ctx$0.600/M

GLM-5 is Z.ai’s flagship open-source foundation model engineered for complex systems design and long-horizon agent workflows. Built for expert developers, it delivers production-grade performance on large-scale programming tasks, rivaling leading...

GLM 4.7
203K ctx$0.380/M

GLM-4.7 is Z.ai’s latest flagship model, featuring upgrades in two key areas: enhanced programming capabilities and more stable multi-step reasoning/execution. It demonstrates significant improvements in executing complex agent tasks while...

Related content

Browse the AI models directory

Compare pricing, local installs, context windows, and modality filters across the full model catalog.

Explore AI agent tools

Find frameworks, SDKs, and infrastructure tools that pair with this model in production workflows.

Read Agent Mag model and agent articles

See Agent Mag coverage of model benchmarks, agent frameworks, and deployment patterns.

Data enriched Apr 24, 2026. Pricing from OpenRouter API.