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Z.ai: GLM-5.3-Flash

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z-ai/glm-5.3-flash
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GLM-5.3-Flash is the lightweight, high-speed model on Z.ai's international site (api.z.ai), released on 2026-08-26. It takes native multimodal input including images and video and targets efficient coding and long-horizon agent tasks. Thinking is always on and cannot be disabled, but the reasoning effort is selectable across low, high, and max. It supports tool use, prompt caching, and web search. Context window: 1M tokens, output: 131K. Available via OpenAI-compatible and Anthropic protocols; note that the OpenAI-compatible surface exposes chat completions and responses endpoints through Ofox.

Context Window
1M
Max Output Tokens
131K
Released
2026-08-26
Capabilities
VisionFunction CallingReasoningPrompt CachingWeb SearchVideo Input
Available Providers
VolcengineZ.ai
Supported Protocols
openaianthropic

Providers

Volcengineprovider.type: "volcengine"
Input Tokens
$0.15/M
Output Tokens
$0.5/M
Cache Read
$0.03/M
Web Search
$0.01/R
Protocols
openai/v1/chat/completions/v1/responses
anthropic
Z.aiprovider.type: "zai"
Input Tokens
$0.15/M
Output Tokens
$0.5/M
Cache Read
$0.03/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.run/v1",
    api_key="YOUR_OFOX_API_KEY",
)


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


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

Uptime & Status

Related Models

More from GLM

Z.ai: GLM-5.3-FlashX
$0.37/M/$1.25/M
Z.ai: GLM-5.3
$1.4/M/$4.4/M
Z.ai: GLM-5.2
$1.4/M/$4.4/M

Similar Models

OpenAI: GPT-6.1 Sol
$2/M/$10/M
Anthropic: Claude Sonnet 5.5
$2/M/$10/M
Anthropic: Claude Opus 5.5
$4/M/$20/M

Frequently Asked Questions

Z.ai: GLM-5.3-Flash on Ofox.ai costs $0.15/M per million input tokens and $0.5/M per million output tokens. Pay-as-you-go, no monthly fees.