GLM-5.1: API pricing, context window and capabilities

Prices from official vendor price lists · October 2026

GLM-5.1 costs $1.4 per 1M input tokens and $4.4 per 1M output tokens, with a 200K context window. Mid-priced: dearer than 71% of this rating, with GLM 5V Turbo as the nearest cheaper Z.ai option. Recorded for reasoning, free tier, open weights.

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Capabilities

API $/1M (in / out)

$1.4 / $4.4

Context window

200K tokens

Price / mo

API only

Overview Reviews

GLM-5.1 is an AI model from Z.ai, priced at $1.4 input and $4.4 output per 1M tokens. That places it in the mid tier of this rating — dearer than 71% of the 205 priced models listed.

It holds 200K tokens in a single conversation. Capabilities recorded in this rating: text & chat, reasoning, tool calling, structured JSON output, prompt caching. Access is through the API rather than a consumer subscription.

API price$1.4 / $4.4per 1M tokens, in / out

Context200K tokenstokens per conversation

VendorZ.aiall models from this vendor

TierMiddearer than 71% of models

Cost calculator

1M tokens/mo10M tokens/mo50M tokens/mo200M tokens/mo

Standard$3.65~~AED 13 per month~~

With batch −50%$1.83~~AED 7 per month~~

With caching on input$3.34~~AED 12 per month~~

Standard$36.50~~AED 134 per month~~

With batch −50%$18.25~~AED 67 per month~~

With caching on input$33.35~~AED 122 per month~~

Standard$183~~AED 670 per month~~

With batch −50%$91.25~~AED 335 per month~~

With caching on input$167~~AED 612 per month~~

Standard$730~~AED 2,681 per month~~

With batch −50%$365~~AED 1,340 per month~~

With caching on input$667~~AED 2,450 per month~~

Assumes a 1:3 input-to-output ratio, which is typical for chat and generation. Dirham figures use 3.6725 per dollar. Batch and caching discounts apply where the vendor offers them.

Compared with alternatives

How GLM-5.1 sits against its neighbours in this rating. Tap a card to open that model.

Muse Spark 1.2

Cheaper

Good and poor fit

Good fit

Multi-step analysis, planning and code review, where the first plausible answer is often wrong.
General text generation and conversation across languages.

Poor fit

Anything requiring image input — this model does not accept it.

Related filters

Text & chat234 models for text generation and chat

Reasoning175 models that think before answering

Tool calling172 models that call your functions

Prompt caching153 models with cheap repeated context

Batch API146 models with half-price async processing

Z.ai12 models from this vendor

All 245 modelsThe full rating with filters and prices

Frequently asked questions

How much does GLM-5.1 cost?

$1.4 / $4.4 per 1M tokens, input and output. In dirhams that is roughly AED 5.14 per 1M input tokens. Batch processing halves it where the vendor offers it.

What is the context window of GLM-5.1?

200K tokens in a single conversation.

What can GLM-5.1 do?

In this rating it is recorded with: text & chat, reasoning, tool calling, structured JSON output, prompt caching, batch API, free tier, multilingual, open weights.

Is GLM-5.1 a good choice?

It depends on the job. See the good-fit and poor-fit lists above, and compare against the neighbouring models before committing.

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