GLM 5.3 Flash

Getting started

Call GLM 5.3 Flash through AI Gateway with the AI SDK generateText and streamText functions, or through the OpenAI Chat Completions, OpenAI Responses, and Anthropic Messages APIs by changing the base URL. AI Gateway authenticates the request and routes it to an available provider.

Install the AI SDK (pnpm add ai dotenv), create an API key from the API Keys page, and set it as AI_GATEWAY_API_KEY in your environment. Full setup is covered in the text generation quickstart.

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import { generateText } from 'ai';
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import 'dotenv/config';
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async function main() {
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  const result = await generateText({
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    model: 'zai/glm-5.3-flash',
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    prompt: 'Why is the sky blue?',
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  });
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  console.log(result.text);
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}
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main().catch(console.error);

Top-level parameters

The same GLM 5.3 Flash request in each API format AI Gateway supports.

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import { generateText } from 'ai';
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import 'dotenv/config';
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async function main() {
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  const result = await generateText({
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    model: 'zai/glm-5.3-flash',
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    system: 'You are a concise technical assistant.',
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    prompt: 'Summarize the tradeoffs between static generation and SSR.',
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    maxOutputTokens: 1024,
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  });
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  console.log(result.text);
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}
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main().catch(console.error);

Standard parameters like prompt, messages, temperature, and tools work as documented in the AI SDK docs. These are the parameters with model-specific behavior.

Input limits

Provider options

Set AI Gateway routing options under providerOptions.gateway. For provider-specific options, pass them under the provider’s namespace as documented by the AI SDK.

Learn more in the AI SDK provider docs.

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import { generateText } from 'ai';
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import 'dotenv/config';
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async function main() {
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  const result = await generateText({
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    model: 'zai/glm-5.3-flash',
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    prompt: 'Why is the sky blue?',
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    providerOptions: {
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      gateway: {
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        only: ['zai', 'baseten'],
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      },
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    },
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  });
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  console.log(result.text);
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}
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main().catch(console.error);

These AI Gateway routing options apply to every model. Provider-specific options pass through under the provider’s own namespace (for example providerOptions.anthropic) exactly as documented by the AI SDK.