LLM Reference
Featherless

Using GLM-5.3 on Featherless

Implementation guide · GLM-5 · Zhipu AI

Serverless

Featherless exposes GLM-5.3 through model ID zai-org/GLM-5.3. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-09-24. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at Featherless and generate an API key.
  2. 2
    Use the Featherless SDK or REST API to call zai-org/GLM-5.3 — see the documentation for request format.
  3. 3
    You'll be billed $1.40/1M input, $4.40/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

Install
pip install openai
API key
FEATHERLESS_API_KEY
Model ID
zai-org/GLM-5.3

Use exact Featherless catalog id in modelProvider.providerModelId (HF-style org/name). Not interchangeable with LLM Reference slugs.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.featherless.ai/v1",
    api_key=os.environ["FEATHERLESS_API_KEY"],
)
response = client.chat.completions.create(
    model="zai-org/GLM-5.3",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

Pricing on Featherless

TypePrice (per 1M)
Input tokens$1.40
Output tokens$4.40

Capabilities

ReasoningJSON / Tool useStructured OutputsPrompt Caching

About GLM-5.3

GLM-5.3 is Z.ai's August 2026 coding-first post-training release on the same GLM-5.2 base model, focused on complex software engineering, long-horizon agentic coding, and emergent cybersecurity evaluation. It is available through the GLM Coding Plan and Z.ai API; open weights are scheduled after safety hardening. Official API model ID: glm-5.3.

Full model details →

Model Specs

Released2026-08-14
Context1m

Also available on(2)

Z.ai$1.40/1MOpenRouter$1.40/1M
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Provider

Featherless
Featherless