GLM-5.3-Flash API, pricing, playground & code

Name: GLM-5.3-Flash API
Brand: Z.ai

Overview

About GLM-5.3-Flash

Native multimodal coding model at the lowest rate in the catalog. Every model on CompanyFabric shares the same API key, billing balance, and rate-limit envelope, one integration covers the entire library.

Facts

At a glance

Availability

Live

Pricing

$0.075/Mtok in

Metered exactly per call

Context window

1,000k tokens

Commercial use

See license

Commercial output use permitted per Z.ai terms.

Variants

All endpoints

GLM-5.3-Flash

$0.075/Mtok in

Native multimodal coding model at the lowest rate in the catalog.

Chat Completions

GLM-5.2

$1.4/Mtok in

Z.ai's open-weight frontier challenger, strong coding and reasoning with one of the best free tiers in class.

Chat Completions

Quickstart

How to use the GLM-5.3-Flash API

1
Create a free CompanyFabric account, starter credits are included, no card required.
2
Copy your API key from the dashboard. One key covers every model in the library.
3
Point any OpenAI SDK at api.companyfabric.com/v1 and set model to "z-ai/glm-5-3-flash".
4
Read the exact metered cost of the call from the response, the same number shown in the playground.

Use cases

What teams build with it

Agents & copilots

Drive agent loops, tool calls, and user-facing assistants over the OpenAI-compatible endpoint.

agentstool useassistants

Content pipelines

Summarization, rewriting, and structured generation at metered per-token cost.

contentsummarization

Extraction & classification

Turn unstructured input into typed JSON with schema-constrained output.

extractionjson mode

Get better output

Prompting tips

State the output format before the task, models follow contracts declared early.
Few-shot beats description: two worked examples outperform a paragraph of rules.
Cap output length explicitly when cost matters; output tokens dominate most bills.

Exact, metered, prepaid

GLM-5.3-Flash pricing

GLM-5.3-Flash pricing is per token: $0.08 / M input · $0.25 / M output. Output tokens cost 3.3× input tokens, so long generations, not long prompts, are what actually drive most bills. A typical call with a 2k-token prompt and a 1k-token answer costs about $0.0004.

Every call is metered exactly and attributed to your key, the dashboard, the API usage response, and your invoice all read from the same ledger row. Cap any key's monthly spend with a budget cap, and bring your own provider key (BYOK) at 0% platform fee if you already have a direct contract.

Endpoint	Type	Price
GLM-5.3-Flash	Chat	$0.08 / M input · $0.25 / M output
GLM-5.2	Chat	$1.4 / M input · $4.4 / M output

Starter credits

Use GLM-5.3-Flash free

Your CompanyFabric starter credits cover your first GLM-5.3-Flash calls at no cost, create a free account, no card required, and the credits apply to GLM-5.3-Flash and every other model on the key. When they run out, prepaid credits or BYOK (0% fee) take over with no plan to pick.

All ways to use AI models free →

Production-grade

Code samples

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://api.companyfabric.com/v1",
  apiKey: process.env.COMPANYFABRIC_API_KEY,
})

const res = await client.chat.completions.create({
  model: "z-ai/glm-5-3-flash",
  max_tokens: 1024,
  temperature: 0.7,
  messages: [{ role: "user", content: "Say hello from the fabric." }],
})

console.log(res.choices[0].message.content)

Playground

Try it in the browser

Playground$0.075 in / $0.25 out per 1M tokens

Model

Max output

Prompt

Comparisons

GLM-5.3-Flash vs the alternatives

GLM-5.3-Flash vs DeepSeek V4.1 Flash

GLM-5.3-Flash and DeepSeek V4.1 Flash compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices, A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

GLM-5.3-Flash vs Gemini 3.7 Flash

GLM-5.3-Flash and Gemini 3.7 Flash compete for the same text workloads. Both run behind the same CompanyFabric key at exact metered prices, A/B them on your real prompts and let the outputs decide, then switch with a one-line change.

FAQ

Frequently asked questions

How much does the GLM-5.3-Flash API cost?

$0.08 / M input · $0.25 / M output. Every call is metered exactly and shown before you run it.

How do I get a GLM-5.3-Flash API key?

Create a CompanyFabric account, and one key unlocks GLM-5.3-Flash and every other model in the library. Free starter credits are included, no subscription, no card required to try it.

Why use GLM-5.3-Flash on CompanyFabric instead of going direct?

One key, one prepaid balance, and one rate-limit envelope across the whole library, at pricing at parity with or below the direct API. Model switching is a one-line change, and BYOK routing is 0% fee.

Is the API OpenAI-compatible?

Yes, point any OpenAI SDK at api.companyfabric.com/v1 and set model to "z-ai/glm-5-3-flash".

Can I use the output commercially?

Commercial output use permitted per Z.ai terms.

How does billing work?

Prepaid credits via card, or BYOK with your own provider keys at 0% platform fee. No subscription required; balances never expire.

Provider

About Z.ai

Z.ai publishes the glm family. Also in this family: GLM-5.2. License: Commercial output use permitted per Z.ai terms.

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One key. Every model. Exact prices.

Run GLM-5.3-Flash with free starter credits. Free starter credits included, no subscription required.

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