GLM 5.3
GLM 5.3 is a large-scale reasoning model developed by Z.ai for complex software engineering and long-horizon agent tasks. It features a 1-million-token context window and is designed to handle intricate multi-step workflows.
GLM 5.3 specs and pricing
- Provider: Z.ai
- Released: August 18, 2026
- Context window: 1M tokens
- Max output: 944K tokens
- Input: text
- Output: text
- Price: $0.07 input / $1.40 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What GLM 5.3 is good at
- Complex software engineering projects
- Long-horizon agent tasks
- Multi-step reasoning workflows
To-dos to try with GLM 5.3
- Analyze a large codebase to identify potential architectural bottlenecks.
- Break down a complex project requirement into a series of actionable development tasks.
- Process extensive technical documentation to generate a comprehensive implementation plan.
FAQ
- Who developed GLM 5.3? GLM 5.3 is a large-scale reasoning model developed by Z.ai.
- What is the primary focus of this model? The model is specifically built for complex software engineering and long-horizon agent tasks that require advanced reasoning capabilities.
- How much does GLM 5.3 cost? GLM 5.3 costs $0.07 per million input tokens and $1.40 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 0.39 credits ($1 = 100 credits).
- What is the context window of GLM 5.3? GLM 5.3 can read up to 1M tokens at once and write up to 944K tokens in one reply.
- Can I use GLM 5.3 without coding? Yes. In todo.is you pick GLM 5.3 as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.