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Reflection

Beam 1.0

The basics

Released

Apr 7
Oct 5

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.

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 ↗
No app known; download it instead

Price and limits, for developers

Input

Per million tokens

$1.40
Not listed

Output

Per million tokens

$4.40
Not listed

Cached input

Per million tokens

$0.26
Not listed

Context window

How much it takes in at once

200K tokens about 150,000 words
Not listed

How they score

Combined test score

Epoch Capabilities Index · Epoch AI

151#66 of 237
151#64 of 237

Too close to call: GLM-5.1 and Beam 1.0 are within the margin of error.

Chat answers, by people's votes

LMArena text, adjusted for style · LMArena

1,465#48 of 86
Not ranked

Only GLM-5.1 is in this ranking, which lists the most-voted models.

Building apps, by people's votes

LMArena WebDev · LMArena

1,508#57 of 85
Not ranked

Only GLM-5.1 is in this ranking, which lists the most-voted models.

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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