GLM 5.1

Z.ai · Released April 2026

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...

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

Facts and pricing

Provider

Z.ai

Context window

203K tokens

Input price

10.6 credits / 1M tokens ($0.97 raw)

Output price

33.4 credits / 1M tokens ($3.04 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 1.10x margin. Raw prices shown per 1M tokens.

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What GLM 5.1 is best for

• Everyday chat and drafting on an open-weight model with transparent lineage
• Long documents: the 203K-token window holds lengthy reports, contracts or papers whole
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a open weight model like GLM 5.1:

• Draft a project update from these rough notes
• Explain how HTTPS works to a curious teenager
• Turn this list of features into a changelog entry
• Brainstorm objections to this proposal and how to answer them

Z.ai family

All 12 Z.ai models

Compare GLM 5.1

• GLM 5.1 vs GLM 5.2

Frequently asked questions

What is GLM 5.1?

GLM 5.1 is an AI model by Z.ai. GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...

How much does GLM 5.1 cost on Zeplik?

Input tokens cost 10.6 credits per million and output tokens 33.4 credits per million (1 credit = $0.10; the raw provider rates are $0.97 and $3.04 per million). New accounts start with free credits.

How long can a conversation with GLM 5.1 be?

GLM 5.1 has a 203K-token context window (202,752 tokens), which covers the conversation plus any documents you attach.

Does GLM 5.1 support images and tools?

GLM 5.1 is text-only and supports tool calling.

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