How much does Z.ai: GLM 5.1 cost per 1M tokens?

Z.ai: GLM 5.1 costs $0.965 per 1M input tokens and $3.03 per 1M output tokens on the standard tier. Cached input is $0.179 per 1M.

What is Z.ai: GLM 5.1's context window?

Z.ai: GLM 5.1 accepts up to 204,800 tokens in a single request, and can return up to 131,072 output tokens.

Is there a cheaper OpenRouter model than Z.ai: GLM 5.1?

Yes. OpenAI: GPT-3.5 Turbo is $0.500 per 1M input tokens versus $0.965 for Z.ai: GLM 5.1, with a 16,385 token context window.

Where does this Z.ai: GLM 5.1 price come from?

From the OpenRouter catalogue, because OpenRouter does not publish machine-readable pricing. OpenRouter is a reseller, so its rate can differ from OpenRouter's own — verify before committing spend.

Z.ai: GLM 5.1 pricing

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Z.ai: GLM 5.1 from OpenRouter costs $0.965 per 1M input tokens and $3.03 per 1M output tokens. Cached input is $0.179 per 1M. Context window 204,800 tokens.

API id z-ai/glm-5.1 · OpenRouter · source · updated 2026-09-25 · general-purpose

$0.965

Input / 1M tokens

$3.03

Output / 1M tokens

$0.179

Cached input / 1M

205K

Context window

Z.ai: GLM 5.1 specifications

Provider: OpenRouter
API id: z-ai/glm-5.1
Model type: general-purpose
Context window: 205K tokens
Max output: 131K tokens
Currency: USD
Price source: Provider API
Last checked: 2026-09-25

GLM-5.1 across providers

The same model, priced by every seller we track. Ranked by the cost of 1M input + 1M output tokens, standard tier; savings measured against buying from the vendor directly.

Provider	Input /1M	Cached /1M	Output /1M	1M in + 1M out	vs vendor
OpenRouterHostCheapestviewing	$0.965	$0.179	$3.03	$4.00	−31%
Zhipu AI (GLM)Vendor	$1.40	$0.260	$4.40	$5.80	—

What Z.ai: GLM 5.1 costs in practice

Estimated cost at common usage volumes
Workload	Input tokens	Output tokens	Estimated cost
Short chat turn	1,000	500	$0.0025
Document summary	50,000	2,000	$0.05
1M tokens in, 200K out	1,000,000	200,000	$1.57

Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.

Z.ai: GLM 5.1 price history

Recorded	Input /1M	Output /1M
2026-09-25	$0.965	$3.03
2026-08-30	$0.966	$3.04
2026-08-27	$1.26	$3.96

Common questions

How much does Z.ai: GLM 5.1 cost per 1M tokens?: Z.ai: GLM 5.1 costs $0.965 per 1M input tokens and $3.03 per 1M output tokens on the standard tier. Cached input is $0.179 per 1M.
What is Z.ai: GLM 5.1's context window?: Z.ai: GLM 5.1 accepts up to 204,800 tokens in a single request, and can return up to 131,072 output tokens.
Is there a cheaper OpenRouter model than Z.ai: GLM 5.1?: Yes. OpenAI: GPT-3.5 Turbo is $0.500 per 1M input tokens versus $0.965 for Z.ai: GLM 5.1, with a 16,385 token context window.
Where does this Z.ai: GLM 5.1 price come from?: From the OpenRouter catalogue, because OpenRouter does not publish machine-readable pricing. OpenRouter is a reseller, so its rate can differ from OpenRouter's own — verify before committing spend.

Head-to-head comparisons

Compare Z.ai: GLM 5.1 with another model →

Other OpenRouter models

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