glm-5.3

Name: zai-org/glm-5.3
Brand: Z.ai
Price: 1.4 USD
Availability: InStock

Z.aiAdded Sep 2, 2026New

Model idzai-org/glm-5.3

Z.ai's flagship and, by its own account, the most capable open-weights model for coding. Built for coding agents such as Claude Code, with major gains on long, multi-step agent work and a 1M-token context for project-scale sessions.

Cost /1M tokens

$1.40input

$0.31cached

$4.40output

Context

1Mtokens

Live speed

226 tok/s · 0.90s to first token

Speed

Throughput users got on glm-5.3 with Keln API in the last 24 hours.

Latency

Time to first token users got on glm-5.3 with Keln API in the last 24 hours.

Capabilities

Input

Text

Tool calling

Yes

JSON output

Yes

Reasoning

Yes

Web search

With opt-in

Data retention

Zero

Use the API

Create an API key, save it to KELN_API_KEY, then call the endpoint below.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.keln.ai/v1/",
    api_key=os.environ.get("KELN_API_KEY"),
)

resp = client.chat.completions.create(
    model="zai-org/glm-5.3",
    messages=[{"role": "user", "content": "Hello"}],
)
print(resp.choices[0].message.content)