Z.ai: GLM 5 Original Thinking
GLM 5 Original Thinking is a reasoning model from Z.ai released on Feb 11, 2026. It reads text and writes text, with a 200K token context window and up to 128K tokens per reply.
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It costs $0.60 per million input tokens and $1.90 per million output tokens. Cached input bills at $0.10, 83% less than fresh input.
It supports tool calling, structured JSON output and prompt caching, and its weights are open, so you can host it yourself.
- Modalities
- In / out price
- $0.60 / $1.90 per 1M
- Context
- 200K
- Max output
- 128K
- Released
- Feb 11, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GLM 5 Original Thinking pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.60 / 1M tokens | |
|---|---|---|
| Output | $1.90 / 1M tokens | |
| Cached input (read) | $0.10 / 1M tokens | 83% off input |
What GLM 5 Original Thinking costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call GLM 5 Original Thinking through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
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GLM 5 Original Thinking questions
How much does the GLM 5 Original Thinking API cost?
$0.60 per million input tokens and $1.90 per million output tokens, with cached input at $0.10. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of GLM 5 Original Thinking?
200,000 tokens of input, and it can write up to 128,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does GLM 5 Original Thinking support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is GLM 5 Original Thinking open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was GLM 5 Original Thinking released?
Feb 11, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on GLM 5 Original Thinking?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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