GLM 5.3 FlashX

Z.ai · Released September 2026

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.

It is part of Z.ai's GLM series, an open-weight line where the 5.x generation leads, Prime raises throughput, Flash and Turbo servings cut latency and cost, and 5V adds vision.

Facts and pricing

Provider

Z.ai

Context window

1.0M tokens

Input price

4.4 credits / 1M tokens ($0.37 raw)

Output price

15.0 credits / 1M tokens ($1.25 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

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What GLM 5.3 FlashX is best for

• High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
• Very long documents and codebases: a 1.0M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a fast and light model like GLM 5.3 FlashX:

• Summarize this article in five bullet points
• Rewrite this email to be shorter and friendlier
• Give me ten name ideas for a hiking newsletter
• Translate this paragraph to Spanish and keep the tone

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Frequently asked questions

What is GLM 5.3 FlashX?

GLM 5.3 FlashX is an AI model by Z.ai. 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.

How much does GLM 5.3 FlashX cost on Zeplik?

Input tokens cost 4.4 credits per million and output tokens 15.0 credits per million (1 credit = $0.10; the raw provider rates are $0.37 and $1.25 per million). New accounts start with free credits.

How long can a conversation with GLM 5.3 FlashX be?

GLM 5.3 FlashX has a 1.0M-token context window (1,048,576 tokens), which covers the conversation plus any documents you attach.

Does GLM 5.3 FlashX support images and tools?

GLM 5.3 FlashX accepts image input and supports tool calling.

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