What is Z.ai: GLM-5.3-FlashX's context window?

Z.ai: GLM-5.3-FlashX supports a context window of 1,048,576 tokens, allowing you to process large documents and maintain long conversations.

How to use Z.ai: GLM-5.3-FlashX API via Ofox?

Simply set your base URL to https://api.ofox.io/v1 and use your Ofox API key. The API is OpenAI-compatible — just change the base URL and API key in your existing code.

Z.ai: GLM-5.3-FlashX

Name: Z.ai: GLM-5.3-FlashX
Brand: z-ai
Price: 0.37 USD
Availability: InStock

Chat-59%

z-ai/glm-5.3-flashx

Compare Try in Playground Get started

GLM-5.3-FlashX is z.ai's lightweight, high-speed model on the international site (api.z.ai), built for efficient coding and long-horizon Agent tasks, with inference speeds of up to 200 tokens/s for a faster, smoother experience. It supports native multimodal input (images, video), 1M context, always-on thinking (which cannot be disabled, with low, high, and max reasoning effort levels), prompt caching, tool calling, and web search, and connects through both the OpenAI-compatible and Anthropic protocols (the Responses endpoint is not supported).

Context Window

Max Output Tokens

131K

Released

2026-08-26

Capabilities

VisionFunction CallingReasoningPrompt CachingWeb SearchVideo Input

Available Providers

Z.ai

Supported Protocols

openaianthropic

Providers

Z.aiprovider.type: "zai"

-59%

Input Tokens

$0.15/M

$0.37/M

Output Tokens

$0.5/M

$1.25/M

Cache Read

$0.03/M

$0.075/M

Web Search

$0.01/R

Protocols

openai/v1/chat/completions

anthropic

Playground

Open in OfoxChat

Code Examples

from openai import OpenAI

client = OpenAI(
    base_url="https://api.ofox.io/v1",
    api_key="YOUR_OFOX_API_KEY",
)

response = client.chat.completions.create(
    model="z-ai/glm-5.3-flashx",
    messages=[
        {"role": "user", "content": "Hello!"}
    ],
)

print(response.choices[0].message.content)