Z.ai · Model
GLM 5.3 Prime pricing, context window and specs
GLM 5.3 Prime costs $2.80 per million input tokens and $8.80 per million output tokens, and reads up to 1,000,000 tokens per request. By blended price it is the most expensive of Z.ai’s 7 current models here.
- Input / 1M
- $2.80
- Output / 1M
- $8.80
- Cached / 1M
- $0.56
- Context
- 1,000,000
- Max output
- 131,072
- Released
- 2026-09-23
Estimate your cost with GLM 5.3 PrimeCompare all Z.ai modelsCount tokens for GLM 5.3 Prime
Pricing
GLM 5.3 Prime API pricing
| Price per 1M tokens | Input | Output |
|---|---|---|
| Standard | $2.80 | $8.80 |
| Cached input (read) | $0.56 | – |
Output costs 3.1× the input price, so long replies drive the bill more than long prompts. If your requests share a long fixed prefix, such as a system prompt or tool definitions, caching cuts that part to 20% of the normal input price.
Examples
What GLM 5.3 Prime costs in practice
| Workload | Tokens in / out | Requests/day | Per request | Per month |
|---|---|---|---|---|
| Support chatbot50% cached | 1,500 / 400 | 1,000 | $0.00604 | $183.72 |
| RAG app20% cached | 6,000 / 500 | 500 | $0.0185 | $281.54 |
| Coding agent80% cached | 40,000 / 2,000 | 200 | $0.0579 | $352.35 |
| Document summariser | 8,000 / 600 | 300 | $0.0277 | $252.58 |
Change any number in the cost calculator.
Context
Context window
GLM 5.3 Prime accepts up to 1,000,000 tokens per request, roughly 750,000 English words or 1,500 pages. That budget is shared between your prompt and the reply, and a single reply is capped at 131,072 tokens.
Filling the whole window with one prompt costs about $2.80 at list price, so for repeated long-document work, retrieval (sending only the relevant parts) or prompt caching is usually much cheaper.
Features
Capabilities
- Image input
- No
- Tool / function calling
- Yes
- Reasoning mode
- Yes
- Prompt caching
- Yes
- Structured output
- No
- Open weights
- No
- Accepts
- text
- Knowledge cutoff
- Not published
As declared by the provider’s API. It shows a feature exists, not how well it works.
API
GLM 5.3 Prime model ID
- OpenRouter
z-ai/glm-5.3-prime
Use the OpenRouter ID when calling it through OpenRouter; Z.ai’s own API may name it differently. See the model ID reference for the providers we document.
Z.ai
Where GLM 5.3 Prime sits in Z.ai’s line-up
Ranked by blended price (three parts input to one part output, $4.30 per 1M for GLM 5.3 Prime), it is the most expensive of Z.ai’s 7 current models here. One step down, GLM 5.3 costs $2.15 blended (50% less). Unlike GLM 5.3 Prime, it has open weights. See every Z.ai model and price
| Model | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|
| GLM 5.3 Flash | $0.15 | $0.50 | 1,048,575 | 2026-08-26 |
| GLM 4.6V | $0.30 | $0.90 | 131,072 | 2025-12-08 |
| GLM 5.3 FlashX | $0.37 | $1.25 | 1,048,576 | 2026-09-18 |
| GLM 5 Turbo | $1.20 | $4 | 202,752 | 2026-03-15 |
| GLM 5V Turbo | $1.20 | $4 | 202,752 | 2026-04-01 |
| GLM 5.3 | $1.40 | $4.40 | 1,048,576 | 2026-08-18 |
| GLM 5.3 Prime (this page) | $2.80 | $8.80 | 1,000,000 | 2026-09-23 |
Z.ai’s current models with a page here, cheapest first. Older and superseded models are listed on the provider page and in the comparison table.
Save
Cheaper alternatives
- GLM 4.6VZ.ai90% cheaper
- Qwen3.7 PlusQwen87% cheaper
- Command A+Cohere86% cheaper
- Seed-2.0-LiteByteDance Seed84% cheaper
- Gemini 3.5 Flash LiteGoogle80% cheaper
Current models from major providers, one per provider, that keep tool calling, a reasoning mode, a usable context window and output limit. Compared by blended price.
Compare
Similarly priced models
- GPT-5.6 TerraOpenAI$2 / $12
- Gemini 3.1 Pro PreviewGoogle$2 / $12
- Claude Sonnet 5.5Anthropic$2 / $10
- Nova Premier 1.0Amazon$2.50 / $12.50
- Kimi K3Moonshot AI$0.80 / $10
Current models from other major providers, closest blended price.
FAQ
GLM 5.3 Prime questions
How much does GLM 5.3 Prime cost?
GLM 5.3 Prime costs $2.80 per million input tokens and $8.80 per million output tokens, with cached input at $0.56. A typical chatbot reply (1,500 tokens in, 400 out) costs about $0.00772. Use the LLM cost calculator for your own workload.
What is GLM 5.3 Prime’s context window?
1,000,000 tokens, about 750,000 English words or 1,500 printed pages, shared between your prompt and the reply. A single reply can be up to 131,072 tokens.
Does GLM 5.3 Prime support prompt caching and batch requests?
Yes, cached input is billed at $0.56 per million tokens (20% of the normal input price). No batch price is published for it.
What are cheaper alternatives to GLM 5.3 Prime?
With the same essentials (tool calling), the cheapest options are GLM 4.6V (90% cheaper), Qwen3.7 Plus (87% cheaper), Command A+ (86% cheaper). Cheaper doesn’t mean equivalent, so test them on your own prompts.
What is the API model ID for GLM 5.3 Prime?
On OpenRouter it is z-ai/glm-5.3-prime. Z.ai’s own API may use a different name, so check its model list before you deploy. Pass the ID as the model value in each request.
Is GLM 5.3 Prime open source?
No, GLM 5.3 Prime is only available through Z.ai’s API and partners; its weights aren’t published.