Head to head

GLM-5.3 vs GLM-5.1

Price, context, inputs and filters. No benchmarks theatre.

Swap sides

GLM-5.3 costs 9× less per message.

GLM-5.3 holds 5.1× more context.

Fact

GLM-5.3Z.AI

OpenChat with GLM-5.3

GLM-5.1Z.AI

OpenChat with GLM-5.1

Made by

Z.AI

Content tier

Open

Intelligence

Smart & Cheap

Brilliant

Estimated price per message

~0.42 credits≈ 238 messages for $1

~3.77 credits≈ 26 messages for $1

Context window

1M tokens≈ 1,613 pages of text in one go

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

Current

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.

GLM-5.3 details GLM-5.1 details