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GLM 5.3

A downloadable model for software work and long jobs, with very cheap input.

Last updated October 16, 2026.

Costs here use the prices AI companies charge software developers, so they show relative cost, not your monthly bill. See what ChatGPT, Claude and Gemini charge you.

Made by Z.ai. Free to download.

What it costs

1,000-word essay: $0.01 (about 1 cent)
100 chat messages: $0.19 (about 19 cents)
50-page PDF summary: $0.01 (about 1 cent)

Based on list prices and the assumptions on How we work. Your real cost will differ.

At a glance

Smartness: ★★★★☆ (4 of 5) (our banding of the Artificial Analysis score, where available)
Reads at once: about 1,570 pages (rule of thumb)
Understands: text
Free to download and run yourself: Yes
Free to use: Not free for developers. Free app plans

Best for

software worklong jobs

Watch out for

Text only. Replies cost far more than what you send in.

Appears in

Best AI models you can download for free

Frequently asked

How much does GLM 5.3 cost to use?
A 1,000-word essay costs about $0.01 (about 1 cent); summarizing a 50-page PDF about $0.01 (about 1 cent). These are developer (API) prices, not an app subscription.

What is GLM 5.3 best for?
A downloadable model for software work and long jobs, with very cheap input.

How much can GLM 5.3 read at once?
About 1,570 pages (a rule of thumb: 1,048,576 tokens at roughly 500 words a page).

Can I download GLM 5.3 for free?
Yes, the model files are published, though running a large one needs powerful hardware.

Under the hood

Maker	Z.ai
Price per 1M input tokens	$0.079
Price per 1M output tokens	$4.80
Context size	1.05M tokens (1,048,576)
Artificial Analysis Intelligence Index	44.8 (source, via OpenRouter)
Open weights	Yes (Hugging Face: zai-org/GLM-5.3)
Speed	Not measured yet
Listed	2026-08-18

Maker's description (technical)

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves...

View on OpenRouter. Our verdict above is editorial, not benchmarked by us.