Z.ai · llm model

GLM-5.3

GLM-5.3 is a Z.ai language model released Aug 14, 2026; Z.ai's newest language model in our dataset is GLM-5.3-Flash. Open weights (GLM-5.3 License (MIT-style plus a MaaS condition)). Z.ai's open-weights coding and agent model, released Aug 14, 2026, with weights on Hugging Face under a permissive license that adds a security-review condition for very large API businesses. Verified against vendor sources on Oct 26, 2026.

Reported Last verified Oct 26, 2026 · All models · JSON · Markdown

ReleasedAug 14, 2026
Context window1.05M1,048,576 tokens
LicenceOpen weights, restrictedGLM-5.3 License (MIT-style plus a MaaS condition)

Innot verifiedOutText

Key facts

GLM-5.3: key facts with sources
Fact	Value	Source
Vendor	Z.ai	n/a
Released	Aug 14, 2026 Announcement date. Z.ai said weights would follow about two weeks later; the Hugging Face repository was created Aug 25, 2026.	source
Status	generally available	n/a
API id	glm-5.3	source
Context window	1,048,576 tokens (1.05M)	source
Output	text	source
Licence	GLM-5.3 License (MIT-style plus a MaaS condition) (open weights) Model-as-a-service operators above US$10B revenue in 12 months must pass a Z.ai security review.	source
Pricing	$1.4 in / $4.4 out per 1M tokens	source

Where GLM-5.3 sits in our data

Released Aug 14, 2026 (week 33 of 2026), in August 2026. Other models in our data released that month: Gemini Omni 1.1 Flash, Gemini 3.5 Transcribe, GLM-5.3-Flash, Qwen3.8-27B, Grok 4.6, Qwen3.8-2.4T-A95B.
The previous Z.ai model we track is GLM-5.2 (Jun 16, 2026), 59 days earlier.
Of the 60 models in our data with a published context window, GLM-5.3 has the number 16 largest (1.05M tokens). Our data is not every model on the market.
All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.

How GLM-5.3 differs from GLM-5.3-Flash

Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.

We have a recorded price for GLM-5.3 but none for GLM-5.3-Flash.
GLM-5.3 lists a 1.05M-token context window; we have none recorded for GLM-5.3-Flash.
GLM-5.3 came out 12 days before GLM-5.3-Flash.
Facts for the other model: GLM-5.3-Flash.

What the sources say

These are claims from the linked pages, not our measurements.

Vendor claim (Z.ai): "the most capable open-weights model for coding", based on Z.ai's own in-house benchmark. We did not verify this.

What we tested

Nothing yet. We have not run GLM-5.3 ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.