GLM 5.1

GLM 5.1 is a Z.ai model available in Quad Chat, with up to 203K tokens of context, tool calling and step-by-step reasoning.

GLM 5.1 at a glance

LabZ.ai
Available onFree plan
Context window203K tokens
Max output64K tokens
Image inputNo
Tool callingYes
ReasoningYes
Privacy lanePrivate (Zero Data Retention)

How to use GLM 5.1 in Quad Chat

  1. Create a free account or sign in.
  2. Open the model picker and choose GLM 5.1.
  3. Ask, attach files, or compare the answer with another model.

Sign in or create a free account · Compare plans

Frequently asked questions

Can I use GLM 5.1 for free?

Yes. GLM 5.1 is available on the Quad Chat Free plan, which needs no credit card and includes 100 monthly credits shared across every model. Larger requests use more credits, and paid plans from $8/month raise the allowance.

What is the context window of GLM 5.1?

GLM 5.1 accepts up to 203K tokens of context and can write up to 64K tokens in one reply, according to the model catalog Quad Chat routes through. Files, pasted text and earlier messages all count toward that window.

Does GLM 5.1 support images, tools and reasoning?

GLM 5.1 works with text input only; pick a vision model in the same chat when you need to attach images. It supports tool calling. It can reason step by step before it answers. You can switch to another model in the same conversation at any time.

Is GLM 5.1 private in Quad Chat?

GLM 5.1 runs on the Quad Chat Private Lane, routed to providers under Zero Data Retention terms. Quad Chat does not train models on your conversations, encrypts chats in transit and at rest, and lets you export or delete them at any time.

How much does GLM 5.1 cost in Quad Chat?

Quad Chat plans have a flat monthly price and draw usage from shared credits, not a per-token bill. The model picker shows an estimate before you send. For reference, the provider's API list price is $1.40 per million input tokens and $4.40 per million output tokens.

Can I compare GLM 5.1 with other models?

Yes. Send one prompt to GLM 5.1 and one or two other models, such as GLM 5.3, GLM 5.2 and GLM 5, and compare the answers side by side in the same thread. You can also switch models mid-conversation without losing your files or context.

Related models

All AI models in Quad Chat