GLM 5.3 Prime: API price, context window and how to connect
GLM 5.3 Prime by Z.ai (Zhipu): $2.8 per million input tokens, $8.8 per million output tokens, a 1M-token window. What it is good for, what to compare it with and how to connect it in SKILLOK.
In this article
In short#
A faster variant of GLM-5.3: the same capabilities with 1.5–2× the output speed through inference acceleration. Text in and out, a 1-million-token window.
Specifications#
| Provider | Z.ai (Zhipu) |
| Released | 2026-09-23 |
| Context window | 1M tokens |
| Accepts | text |
| Answers with | text |
| Reasoning mode | yes |
| Tool calling | yes |
| Open weights | no |
| Identifier | z-ai/glm-5.3-prime |
Price#
| Per 1M tokens | In dollars |
|---|---|
| Input (question, context) | $2.8 |
| Output (answer) | $8.8 |
For reference: a conversation of 20 questions of ~500 tokens and answers of ~800 tokens costs about $0.169. Models in reasoning mode spend more tokens on an answer than the text shows: the reasoning is paid for too.
What it is good for#
- GLM-5.3 when speed matters
- Interactive work with an agent
- Long context
Similar models#
Catalog models with the same kind of output, closest in the price of a typical request.
| Model | Input | Output | Window | Price |
|---|---|---|---|---|
| GPT-6.1 Sol | $2 | $10 | 1.05M | about the same |
| GPT-6.1 Sol Pro | $2 | $10 | 1.05M | about the same |
| Claude Sonnet 5.5 | $2 | $10 | 1M | about the same |
| Gemini 4 Argon | $2 | $10 | 1.05M | about the same |
| Kimi K3 | $0.239 | $11.936 | 1.05M | about the same |
Other Z.ai (Zhipu) models#
How to connect in SKILLOK#
GLM 5.3 Prime works through OpenRouter: add an OpenRouter key in Settings → AI and pick the z-ai/glm-5.3-prime model. It then becomes available in Space AI, in tasks and to the repository agent. In detail — Connecting a model in SKILLOK.
Where the data comes from#
Prices, the context window and capabilities come from the public OpenRouter catalog as of 2026-10-19. A provider may change the price — the exact figure is always on the model's OpenRouter page.
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