GLM-5.3-Flash
Z.ai's GLM-5.3-Flash is a large model free to download, aimed at developers who want strong answers at a lower running cost.
Key facts
- Released
- Aug 20, 2026
- 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.
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- How
- Free to download
- Size
- Parameters: The numbers a model learns during training: a rough measure of its size. Bigger usually means more capable, but slower and pricier to run. 7B means 7 billion.
- Announced as
- “GLM-5.3-Flash: Frontier Intelligence, Flash Cost”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Price and limits
What developers pay to use it through the API: How developers plug a model into their own apps and pay per use. A model that's "in the API" can be used by programmers, even if it isn't in a chat app yet., per million Tokens: The small chunks of text a model reads and writes, about three-quarters of a word each. Prices and limits are counted in tokens. sent (input) or written back (output), and how much it can take in at once.
- Input
- $0.15
- per million tokensCached: $0.03
- Output
- $0.50
- per million tokens
- Context window: How much a model can keep in mind at once: your question, any files you share and its own replies. Measured in tokens; 1,000 tokens is about 750 words.
- 1M tokens
- about 750,000 words
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- Longest answer
- 131K tokens (about 98,000 words)
From the lab's own listing on models.dev and OpenRouter, checked .
How it scores
From independent testers, never the lab's own claims.
- Combined test score#48 of 235
- GPT-6 Astra169
- 2GPT-6.1 Sol169
- 47DeepSeek V4 Flash 0731154
- 48GLM-5.3-Flash154
- 49Muse Spark153
Source: Epoch AI · Epoch Capabilities Index
- Chat answers, by people's votes#33 of 86
- Gemini 4 Carbon1,527
- 2Gemini 4 Argon1,522
- 32Grok 4.20 Beta 11,475
- 33GLM-5.3-Flash1,475
- 34GPT-6 Astra1,474
Source: LMArena · LMArena text, adjusted for style
- Building apps, by people's votes#29 of 85
- Claude Opus 5.51,818
- 2Claude Sonnet 5.51,773
- 28GPT-5.6 Sol1,615
- 29GLM-5.3-Flash1,609
- 30GLM-5.21,608
Source: LMArena · LMArena WebDev
Compare GLM-5.3-Flash with
It came out 6 days after GLM-5.3, the lab's previous model.
The details
GLM-5.3-Flash is a 320 billion parameters: Data-centre scale: it runs on many chips (GPUs) at once. Parameters are the numbers a model learns: a rough measure of its size. text model from Z.ai (Zhipu) for language generation and question answering, released as Open weights: The model's files are public, so anyone can download it, run it on their own computer and build on it, usually for free. trckr labels these "Open". with unrestricted use.
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