GLM 5.1
GLM 5.1 is an AI model developed by Z.ai that specializes in coding tasks and long-horizon projects. It supports reasoning and tool calling, allowing it to work independently on complex, continuous assignments.
GLM 5.1 specs and pricing
- Provider: Z.ai
- Released: April 7, 2026
- Context window: 205K tokens
- Max output: 131K tokens
- Input: text
- Output: text
- Price: $1.40 input / $4.40 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What GLM 5.1 is good at
- Complex software development projects
- Tasks requiring extended multi-step reasoning
- Automated workflows that involve external tool usage
To-dos to try with GLM 5.1
- Analyze this multi-file codebase and identify potential architectural bottlenecks.
- Draft a complete implementation plan for a new feature and execute the necessary function calls to test it.
- Break down this long-term project into sequential tasks and execute them one by one.
FAQ
- What is the primary focus of GLM 5.1? The model is designed to excel at coding capabilities and handling tasks that require long-horizon, continuous work.
- Can this model interact with external tools? Yes, GLM 5.1 supports tool calling, enabling it to perform actions beyond simple text generation.
- How much does GLM 5.1 cost? GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 4.54 credits ($1 = 100 credits).
- What is the context window of GLM 5.1? GLM 5.1 can read up to 205K tokens at once and write up to 131K tokens in one reply.
- Can I use GLM 5.1 without coding? Yes. In todo.is you pick GLM 5.1 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.