Synapse GardenSynapse Garden
Z.AI · MultimodalReleased 2026-08-26

glm-5.3-flash

zai/glm-5.3-flash id

GLM-5.3-Flash is Z.ai’s native multimodal coding model, featuring 320B total parameters, 18B activated parameters, and a 1M-token context window. Its efficient hybrid attention architecture supports visual coding, tool use, and end-to-end professional workflows across code, browsers, documents, and graphical interfaces.

ReasoningTool useChatStructured output
Type
Use glm-5.3-flash
# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'zai/glm-5.3-flash',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })
1M
CONTEXT WINDOW
131K
MAX OUTPUT
$0.165/M
INPUT · PER M
$0.550/M
OUTPUT · PER M
PRICING

List prices, every modality.

RatePer million tokens · USD
Input$0.165/M
Output$0.550/M
Cache read$0.033/M
Honest list pricesHow we calculate prices
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FAQ · GLM-5.3-FLASH

Frequently asked

01 / 04

How do I call glm-5.3-flash from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘zai/glm-5.3-flash’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does glm-5.3-flash cost?

Input: $0.165/M per million tokens. Output: $0.550/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for glm-5.3-flash?

glm-5.3-flash supports a context window of 1M tokens, with a maximum output of 131K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try glm-5.3-flash in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

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