Z.AI

GLM-5.1

Z.AI's coding model built for long-horizon work, pitched as able to grind on one task for hours. Strong at planning, coding and multi-step agent runs, 200K context, text only, open content level. GLM-5.3 is newer and a fraction of the price but sits a tier lower; Kimi K3 is the stronger current open pick.

Chat with GLM-5.1

OpenOpen-weight models with lighter filters. Discuss more, refuse less.

Brilliant

Intelligence

~3.77 credits

Estimated price per message

205K tokens

Context window

Text

Reads

GLM-5.1 is a legacy model. Its successor, GLM-5.3, is faster or cheaper - and chats that used GLM-5.1 move to it automatically.

See GLM-5.3

The facts

Made by

Z.AI

Content tier

OpenOpen-weight models with lighter filters. Discuss more, refuse less.

Intelligence

Brilliant

Estimated price per message

~3.77 credits≈ 26 messages for $1

Context window

205K tokens≈ 315 pages of text in one go

Reads

Text

Writes

Text

Tool use

Yes - search, memory, code and more

Served via

OpenRouter, Unbottled AI

Status

Legacy

A typical message: 16K tokens in, 1.5K out. Short replies cost less. Models served via OpenRouter bill the real provider cost plus our markup, so actual charges vary. 1 credit = $0.01.

Compare GLM-5.1

Same facts, side by side.

GLM-5.1 vs GLM-5.3 GLM-5.1 vs Kimi K3 GLM-5.1 vs Meta Muse Spark 1.3

Try GLM-5.1 now.

No subscription. Free credits to start. The chat opens with GLM-5.1 selected and a prompt ready - just send.

Chat with GLM-5.1