Z Ai/operational
Z.ai: GLM 5.3 Prime
GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration. It supports text input and output with a 1M-token...
1.0M
Context window
tokens
131K
Max output
tokens per reply
42ms
Time to first token
p50, EU region
$8.80
Output price
per 1M tokens
Fit
Where this model earns its place
function calling
Tool use and structured output — dependable JSON for agent loops, RAG pipelines, and workflow automation.
Data handling
Requests are processed in the EU. Prompts are not used for training, and logs follow the retention period in your contract — zero-retention is available on request.
Specifications
Model
- Model ID
- z-ai/glm-5.3-prime
- Provider
- Z Ai
- Context length
- 1.0M
- Max output
- 131K
- Modality
- text
- Licence
- Open Weight
Commercial
- Input
- $2.80
- Output
- $8.80
- Cached input
- $0.56
- Deployment
- serverless
- Availability
- operational
- Last updated
- 2026-10-26
Cost
What a month actually costs
| Workload | Input tokens | Output tokens | Monthly cost |
|---|---|---|---|
| Prototype | 1.0M | 250K | $5.00 |
| Production | 50.0M | 12.0M | $245.60 |
| At scale | 500.0M | 120.0M | $2,456 |
Illustrative volumes at list price, excluding cached-input discounts and any committed-use agreement. Your invoice shows the same rates, itemised per key.
Cheaper by caching
API
Same SDK, different base URL
cURL
curl https://api.itciphtech.com/v1/chat/completions \
-H "Authorization: Bearer $CIPHER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "z-ai/glm-5.3-prime",
"messages": [{"role": "user", "content": "Hello!"}]
}'TypeScript
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.itciphtech.com/v1",
apiKey: process.env.CIPHER_API_KEY,
});
const res = await client.chat.completions.create({
model: "z-ai/glm-5.3-prime",
messages: [{ role: "user", content: "Hello!" }],
});Alternatives
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