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GLM-5.3-FlashX

A very fast version of Zhipu's GLM-5.3-Flash model that can read images and video, offered through online services for developers.

Release page →

GLM-5.3-Prime

A faster version of Zhipu's GLM-5.3 model that writes text about one and a half to two times quicker, offered through online services.

Release page →

The basics

Released

Sep 18
Sep 23

What it does

Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.Reads files: Reads documents such as PDFs.Watches video: Understands video clips you share with it.
Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.

Knowledge cutoff

The latest events it learned about

Not published
Not published

Download

No: it runs on the maker's servers
No: it runs on the maker's servers

Where to use it

Z.ai's app: Z.ai Chat ↗Also for developers, through an API
Z.ai's app: Z.ai Chat ↗Also for developers, through an API

Price and limits, for developers

Input

Per million tokens

$0.37Cheaper
$2.80

Output

Per million tokens

$1.25Cheaper
$8.80

Cached input

Per million tokens

$0.075Cheaper
$0.56

Context window

How much it takes in at once

1M tokens about 750,000 words
1M tokens about 750,000 words

Longest answer

131K tokens about 98,000 words
131K tokens about 98,000 words

How they score

Neither model is in the public rankings trckr follows yet. New models usually appear within a few weeks of launch.

Green marks the better of the two on each row, red the other. Rows where one side isn't listed, or where the gap is too close to call, stay plain.

Popular comparisons

Not sure where to start? Which AI should I use? gives a pick for what you want to do. How to read AI rankings explains the numbers.

Rankings from LMArena and Epoch AI, both CC BY 4.0, updated . Developer prices, context windows and knowledge cutoffs from the labs' own listings on models.dev and from OpenRouter. The app links go to each maker's own app when no source says exactly where the model is available.

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