Z.ai: GLM-5.3-Flash
Z.ai GLM-5.3-Flash API pricing
GLM-5.3-Flash costs $0.060 per million input tokens and $0.200 per million output tokens on Oxyy. These are the pay-as-you-go prices after the current 60% discount (Launch Promo; standard price $0.150 input and $0.500 output), and cached input tokens are billed at $0.012 per million. It accepts text and images and returns text. A cheaper Z.ai option is GLM-4.7-FlashX at $0.028 / $0.160 per 1M tokens; for every model and rate, see GLM API pricing.
Providers
Where this model runs, and what each route costs. Requests are sent to a healthy provider automatically; if one errors, the gateway retries against another serving the same model.
| Provider | Input /M | Output /M | Cache read /M |
|---|---|---|---|
| Z.ai | $0.060 | $0.200 | $0.012 |
Capabilities (9)
Supported parameters (2)
A parameter not listed here may be removed before the request reaches the model. When it is, the request still succeeds and the response names it, with the reason, in provider_specific_fields.dropped_params. Thinking controls work as described below whether or not they are listed.
Thinking
This model always reasons; thinking cannot be turned off. An off request is answered at its lowest effort level, or at its default when it has none, and the response says so in dropped_params. reasoning_effort takes minimal, low, medium, high, xhigh, max, each mapped to the level the model uses for it where the model's levels are known (sometimes a higher level than the word asked for, or off); when it differs, the response names the level used in provider_specific_fields.dropped_params; the default is max.
Pricing
What this model costs on Oxyy, pay as you go. "Charged" is the rate a request is billed at; the standard price is shown beside it for reference.
| Rate | Standard price | Charged | Unit |
|---|---|---|---|
| Input | $0.150 | $0.060 | per 1M input tokens |
| Output | $0.500 | $0.200 | per 1M output tokens |
| Cached input | $0.030 | $0.012 | per 1M cached input tokens |
Discount. Charged rates include the current "Launch Promo" discount of 60% on every rate.
Specifications
- Model ID
glm-5.3-flash- Developer
- Z.ai
- Type
- Text
- Input
- Text and images
- Output
- Text
- Series
- GLM-5
- Image input
- Up to 20 MB each
- Endpoint
/v1/chat/completions
Best for
Quickstart
Call glm-5.3-flash with a POST to /v1/chat/completions on https://api.oxyy.ai, using your Oxyy API key from the OXYY_API_KEY environment variable. The same key works for every model in the catalog.
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.oxyy.ai/v1",
api_key=os.environ["OXYY_API_KEY"],
)
response = client.chat.completions.create(
model="glm-5.3-flash",
messages=[
{"role": "user", "content": "Explain unified AI APIs in one sentence."},
],
)
print(response.choices[0].message.content)Availability
The share of requests to this model that completed successfully over the last 30 days. Requests the caller cancelled, and requests still in flight, are not counted. When an upstream provider errors, the gateway retries against another provider serving the same model, so a single provider incident does not necessarily show up here.
Days are UTC days. Days with no completed requests are omitted rather than drawn at 100% — no traffic is not evidence of availability.
Activity
Token volume and request traffic to this model over time. Daily totals, UTC.
Prompt tokens measure input size. Completion tokens reflect total output length. Reasoning is not priced separately for this model, so it is not itemised here.
Frequently asked questions
What is GLM-5.3-Flash?
How much does GLM-5.3-Flash cost?
Does GLM-5.3-Flash support tool calling and structured outputs?
What inputs and outputs does GLM-5.3-Flash support?
Which API endpoint does GLM-5.3-Flash use?
What other models does Z.ai have?
Alternatives to GLM-5.3-Flash
Models of the same kind from other vendors, closest in price first. Prices are pay-as-you-go on Oxyy, through the same API key.