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The basics

Released

Apr 7
Not known

What it does

Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.
Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.

Knowledge cutoff

The latest events it learned about

Not published
Not published

Download

FreeOpen weights
FreeOpen weights

Where to use it

Z.ai's app: Z.ai Chat ↗
Tencent's app: Yuanbao ↗

Price and limits, for developers

Input

Per million tokens

$1.40
$0.132Cheaper

Output

Per million tokens

$4.40
$0.528Cheaper

Cached input

Per million tokens

$0.26
$0.033Cheaper

Context window

How much it takes in at once

200K tokens about 150,000 words
262K tokens about 200,000 wordsBigger

Longest answer

Not listed
128K tokens about 96,000 words

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

151#64 of 235
Not ranked

Only GLM-5.1 is in this ranking.

Chat answers, by people's votes

LMArena text, adjusted for style · LMArena

1,465#48 of 86
1,454#63 of 86

Neck and neck: in blind votes, people pick each about as often as the other.

Building apps, by people's votes

LMArena WebDev · LMArena

1,508#57 of 85
1,506#58 of 85

Neck and neck: in blind votes, people pick each about as often as the other.

Green marks the better of the two on each row, red the other. Rows where one side isn't listed, or where the gap is too close to call, stay plain.

Popular comparisons

Not sure where to start? Which AI should I use? gives a pick for what you want to do. How to read AI rankings explains the numbers.

Rankings from LMArena and Epoch AI, both CC BY 4.0, updated . Developer prices, context windows and knowledge cutoffs from the labs' own listings on models.dev and from OpenRouter. The app links go to each maker's own app when no source says exactly where the model is available.

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