Quick Answer
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Z.ai GLM API costs Free to $4.40 per million tokens as of August 2026, with 4 plans available including a free tier. Plans: GLM-5.2 ($1.40 in / $4.40 out per 1M tokens) (free), GLM-5 ($1.00 in / $3.20 out per 1M tokens) (free), GLM-4.7 ($0.60 in / $2.20 out per 1M tokens) (free), and GLM-4.7-Flash / GLM-4.5-Flash (free) (free). Pricing depends on your chosen tier, contract length, and negotiated discounts.

Use the interactive pricing calculator to estimate your exact cost based on team size and requirements.

  • Free tier: Yes

Z.ai GLM API offers 4 pricing tiers: GLM-5.2 ($1.40 in / $4.40 out per 1M tokens), GLM-5 ($1.00 in / $3.20 out per 1M tokens), GLM-4.7 ($0.60 in / $2.20 out per 1M tokens), GLM-4.7-Flash / GLM-4.5-Flash (free). The GLM-5 ($1.00 in / $3.20 out per 1M tokens) plan is strong general-purpose workloads.

Last verified: | Sources: 1 pricing pages and reviews
Know Before You Buy — Try Z.ai GLM API Free

Z.ai GLM API lists $0-$4.4/per million tokens, but hidden costs like implementation and support add to the total as of August 2026. Key hidden costs: cached input storage, premium model tiers, conversation history reprocessing. Verified from 1 sources by CostBench.

Hidden Costs Breakdown

1

Cached Input Storage

medium addon

Z.ai currently lists cached input storage as free for a limited time, implying it could become a paid feature in the future, with cached input for GLM-5.2 costing $0.26 per 1 million tokens.

industry

Cached Input Storage: Z.ai currently lists cached input storage as free for a limited time, implying it could become a paid feature in the future

2

Premium Model Tiers

high addon

Utilizing premium model variants, such as GLM-5.2-Fast, can sharply increase costs, as it is priced 64% higher for input and 81% higher for output compared to GLM-5.2.

industry

Its high-throughput tier, GLM-5.2-Fast, is priced higher at $2.29 per 1 million input tokens and $8.00 per 1 million output tokens

3

Conversation History Reprocessing

critical overage

For stateless APIs, sending the full conversation history with each message can significantly inflate costs, potentially leading to a "10x cost multiplier" if not managed through prompt caching.

industry

A 50-message thread can send the equivalent of a short document, leading to a "10x cost multiplier" if not managed through prompt caching

4

Suboptimal Model Selection

medium overage

Choosing a more powerful, and thus more expensive, model than necessary for a task can lead to higher costs.

industry

For instance, GLM-5.2, a flagship model, costs $1.40 per 1 million input tokens and $4.40 per 1 million output tokens

5

Data Training Opt-ins

high compliance

Some LLM providers may use user prompts to improve their models unless users opt out, which can create compliance risks and potential costs if proprietary or confidential data is involved.

industry

Cheaper models like GLM-4.7-FlashX are available at $0.07 input and $0.40 output per 1 million tokens, with some "Flash" models being free

6

System Prompt Overhead

high overage

A lengthy system prompt, re-sent with every request, can accumulate substantial costs.

industry

A 2,000-token system prompt with 100,000 requests per month could cost around $400 monthly at GPT-4.1 rates before any user tokens are counted.

7

Uncapped Output Generation

critical overage

Models can produce variable-length responses, potentially exceeding projected output tokens if max_tokens limits are not explicitly set.

industry

Uncapped Output Generation: Models can produce variable-length responses, potentially exceeding projected output tokens by 10-25 times if max_tokens limits are not explicitly set.

8

Web Search Tool Usage

low addon

Z.ai's built-in Web Search tool costs an additional $0.01 per use, on top of the token charges for the request.

industry

ai's built-in Web Search tool costs an additional $0.01 per use, on top of the token charges for the request.

9

Latency and Data Residency

medium compliance

Z.ai's infrastructure is primarily located in China, which could affect latency for international users and raise data residency concerns, potentially leading to additional compliance or infrastructure costs.

industry

ai's infrastructure is primarily located in China, which could affect latency for international users and raise data residency concerns, potentially leading to additional compliance or infrastructure costs for some buyers.

10

Model Verbosity

medium overage

A more verbose model can lead to higher overall costs for a completed workload due to generating more output tokens.

industry

Model Verbosity: Even with identical per-token rates, a more verbose model can lead to higher overall costs for a completed workload due to generating more output tokens.

Frequently Asked Questions

01 What hidden costs should I budget for with Z.ai GLM API?

Beyond the license fee, budget for: Cached Input Storage ($0.26 per 1 million tokens); Premium Model Tiers (64% higher for input and 81% higher for output); Conversation History Reprocessing (10x cost multiplier); System Prompt Overhead ($400 monthly); Web Search Tool Usage ($0.01 per use). Exact totals depend on your deployment size and negotiated terms.

02 Does Z.ai GLM API charge for implementation?

Implementation costs for Z.ai GLM API vary by deployment size and customization. Contact the vendor or check our sourced hidden-cost breakdown above for verified figures.

03 How much does Z.ai GLM API support cost?

Premium support pricing for Z.ai GLM API depends on your tier and contract terms. See the sourced cost breakdown above for any verified figures we have.

04 Are there overage or storage costs with Z.ai GLM API?

For stateless APIs, sending the full conversation history with each message can significantly inflate costs, potentially leading to a "10x cost multiplier" if not managed through prompt caching.. Estimated impact: 10x cost multiplier.

05 What add-ons cost extra with Z.ai GLM API?

Add-on pricing for Z.ai GLM API varies by feature. The sourced cost breakdown above lists any verified add-on costs we have.

Now You Know the Real Cost — Try Z.ai GLM API Free

Check current Z.ai GLM API pricing

Prices and terms change; verify against the live pricing page.

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