GLM 5.3 FlashX

Name: Z.ai: GLM 5.3 FlashX
Brand: z-ai
SKU: z-ai/glm-5.3-flashx
Price: 0.407 USD
Availability: InStock

z-ai/glm-5.3-flashx

GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s.

$0.407 in · $1.375 out per 1M tokens1M contextSep 18, 2026

about 0.09¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with GLM 5.3 FlashX

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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.407provider $0.37
Output, per 1M tokens: $1.375provider $1.25
Cached input, per 1M: $0.0825provider $0.075
Margin: +10%

Context and formats

Context window: 1,048,576 tokens
Longest answer: 131,072 tokens
Reads: text, images, and video
Makes: text
First listed: 2026-09-18

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=z-ai/glm-5.3-flashx.

About

GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s. Built on the same hybrid sparse and linear attention architecture...

In Z.ai's words.

Try it here

Cmd+Enter sends

The answer appears here.

Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "z-ai/glm-5.3-flashx", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/z-ai/glm-5.3-flashx"><img src="https://useantimatter.com/api/badge/price?id=z-ai%2Fglm-5.3-flashx" alt="GLM 5.3 FlashX price on Antimatter" height="28"></a>

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