GLM-5.3

GLM-5.3 is Z.ai's flagship text model for complex software engineering and long-horizon agent tasks. It uses the same base model as GLM-5.2, with its improvements coming from post-training.

It is well suited to repository-scale coding, debugging, refactoring, terminal workflows, tool-using agents and other multi-step technical tasks that require sustained reasoning.

Its strengths include agentic coding, long-horizon execution, function calling, structured output, context caching and configurable reasoning effort. Z.ai also reports substantial gains in defensive vulnerability analysis.

GLM-5.3 accepts text input only and always uses reasoning. Higher reasoning effort can increase latency and token use. Review generated code and factual claims, and use its security capabilities only in authorized environments.

Choose the glm-5.3 model identifier in a TokenHub API request and use the endpoint and credentials provided by your TokenHub account. Start with a small request and confirm supported parameters before production use.

Z.ai lists GLM-5.3 API pricing at $1.40 per million input tokens and $4.40 per million output tokens, and offers it to GLM Coding Plan users. TokenHub pricing, quotas and regional availability may differ, so check the current model page before use.

Choose it when coding quality, tool use and long-running agent work are priorities. Consider a faster or cheaper model for simple requests, and choose a vision-capable model when the task requires image, screenshot or document understanding.