GLM 5.1
GLM 5.1 advances Z.ai's GLM-5 generation with a focus on long-horizon autonomous coding. It can work independently on a single task for over eight hours, planning, executing, and iterating until it delivers engineering-grade results.
import { streamText } from 'ai'
const result = streamText({ model: 'zai/glm-5.1', prompt: 'Why is the sky blue?'})What To Consider When Choosing a Provider
Zero Data Retention
AI Gateway supports Zero Data Retention for this model via direct gateway requests (BYOK is not included). To configure this, check the documentation.Authentication
AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.
GLM 5.1 excels when given a well-defined task with clear acceptance criteria. Provide a detailed specification, relevant file paths, and expected behavior so the model can plan its autonomous execution effectively.
Tasks running for hours consume tokens proportionally. Monitor usage through AI Gateway's observability tools and set budget limits for extended runs.
Despite autonomous self-correction, review the final output before merging into production. Treat GLM 5.1 as a thorough junior engineer who still needs a code review.
When to Use GLM 5.1
Best For
Large-scale refactors:
Dozens of files where sustained context and iterative testing matter
End-to-end feature implementation:
Spec to tested, working code with minimal human checkpoints
Codebase migrations:
Hours of methodical file-by-file changes
Complex bug investigations:
The model autonomously traces root causes across a large codebase
Autonomous coding agents:
A model capable of multi-hour independent operation
Consider Alternatives When
Short-horizon tasks:
GLM-5 or GLM-5-Turbo handle coding tasks completing in minutes at lower cost
Vision or multimodal input:
GLM-5V-Turbo combines coding with screenshot and GUI understanding
Interactive pair programming:
GLM-4.7-Flash provides fast responses for real-time back-and-forth workflows
Budget-constrained workloads:
GLM-5-Turbo offers GLM-5-class capability at reduced per-token cost for shorter tasks
Conclusion
GLM 5.1 targets the gap between short-burst coding assistance and fully autonomous software engineering. For tasks that take hours of sustained, methodical work, it delivers complete results where shorter-context models would lose coherence or require repeated human intervention.
FAQ
Over eight hours of continuous autonomous operation. It plans, executes, tests, and iterates on its own output throughout that window.
GLM-5 introduced multiple thinking modes and agentic workflows for general-purpose reasoning. GLM 5.1 builds on that foundation with a specific focus on long-horizon coding tasks, sustaining autonomous operation for hours rather than minutes.
202.8K tokens.
Check the pricing panel on this page for today's numbers. AI Gateway tracks rates across every provider that serves GLM 5.1.
Use the zai/glm-5.1 model identifier with your AI Gateway API key. No separate Z.ai account is needed. BYOK is also supported.
