GLM 5.3 Prime

Z.ai · Released September 2026

GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration.

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

1M tokens

Input price

33.6 credits / 1M tokens ($2.80 raw)

Output price

106 credits / 1M tokens ($8.80 raw)

Vision (image input)

No

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 Prime is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like GLM 5.3 Prime:

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

Z.ai family

All 18 Z.ai models

Frequently asked questions

What is GLM 5.3 Prime?

GLM 5.3 Prime is an AI model by Z.ai. GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration.

How much does GLM 5.3 Prime cost on Zeplik?

Input tokens cost 33.6 credits per million and output tokens 106 credits per million (1 credit = $0.10; the raw provider rates are $2.80 and $8.80 per million). New accounts start with free credits.

How long can a conversation with GLM 5.3 Prime be?

GLM 5.3 Prime has a 1M-token context window (1,000,000 tokens), which covers the conversation plus any documents you attach.

Does GLM 5.3 Prime support images and tools?

GLM 5.3 Prime is text-only and supports tool calling.

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