Z.ai: GLM-5.3

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z-ai/glm-5.3
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GLM-5.3 is Z.ai's flagship reasoning model on its international platform (api.z.ai), building on GLM-5.2 with stronger coding ability and a better performance-per-token balance for complex software engineering and long-horizon agent tasks. Thinking is always on, with low/high/max reasoning effort levels to tune cost against depth. It supports prompt caching, tool use (function calling), and web search. Context window: 1M tokens, output: 128K. Available via OpenAI and Anthropic protocols.

Context Window
1M
Max Output Tokens
128K
Released
2026-08-19
Capabilities
Function CallingReasoningPrompt CachingWeb Search
Available Providers
VolcengineZ.ai
Supported Protocols
openaianthropic

Providers

Volcengine
Input Tokens
$1.4/M
Output Tokens
$4.4/M
Cache Read
$0.26/M
Web Search
$0.01/R
Protocols
openai/v1/chat/completions/v1/responses
anthropic
Z.ai
Input Tokens
$1.4/M
Output Tokens
$4.4/M
Cache Read
$0.26/M
Web Search
$0.01/R
Protocols
openai/v1/chat/completions
anthropic

Code Examples

from openai import OpenAI


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


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


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

Uptime & Status

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Frequently Asked Questions

Z.ai: GLM-5.3 on Ofox.ai costs $1.4/M per million input tokens and $4.4/M per million output tokens. Pay-as-you-go, no monthly fees.