# Z.AI models

Canonical HTML page: [Z.AI models](<https://impossibl.com/zai>)
Markdown alternative: [Z.AI models as Markdown](<https://impossibl.com/zai.md>)

Access 11 models from Z.AI through the Impossibl API, including GLM-4.5, GLM-4.5 Air, and GLM-4.6. Compare API pricing, context windows, and capabilities.

Select two or three models to [compare specifications and API costs](<https://impossibl.com/compare.md>). Model types and billing units are not interchangeable.

## Models

### [GLM-4.5](<https://impossibl.com/zai/glm-4.5>)

GLM-4.5 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 128,000 tokens. The advertised input rate is $0.60 per million input tokens. The advertised output rate is $2.20 per million output tokens.

- API identifier: `zai/glm-4.5`
- Creator: Z.AI; model type: Text generation.
- Context window: 128,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $0.60 per million input tokens; $2.20 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-4.5.md>)

### [GLM-4.5 Air](<https://impossibl.com/zai/glm-4.5-air>)

GLM-4.5 Air is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 128,000 tokens. The advertised input rate is $0.20 per million input tokens. The advertised output rate is $1.10 per million output tokens.

- API identifier: `zai/glm-4.5-air`
- Creator: Z.AI; model type: Text generation.
- Context window: 128,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $0.20 per million input tokens; $1.10 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-4.5-air.md>)

### [GLM-4.6](<https://impossibl.com/zai/glm-4.6>)

GLM-4.6 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $0.60 per million input tokens. The advertised output rate is $2.20 per million output tokens.

- API identifier: `zai/glm-4.6`
- Creator: Z.AI; model type: Text generation.
- Context window: 200,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $0.60 per million input tokens; $2.20 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-4.6.md>)

### [GLM-4.7](<https://impossibl.com/zai/glm-4.7>)

GLM-4.7 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $0.60 per million input tokens. The advertised output rate is $2.20 per million output tokens.

- API identifier: `zai/glm-4.7`
- Creator: Z.AI; model type: Text generation.
- Context window: 200,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $0.60 per million input tokens; $2.20 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-4.7.md>)

### [GLM-5](<https://impossibl.com/zai/glm-5>)

GLM-5 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $1.00 per million input tokens. The advertised output rate is $3.20 per million output tokens.

- API identifier: `zai/glm-5`
- Creator: Z.AI; model type: Text generation.
- Context window: 200,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $1.00 per million input tokens; $3.20 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.md>)

### [GLM-5 Turbo](<https://impossibl.com/zai/glm-5-turbo>)

GLM-5 Turbo is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $1.20 per million input tokens. The advertised output rate is $4.00 per million output tokens.

- API identifier: `zai/glm-5-turbo`
- Creator: Z.AI; model type: Text generation.
- Context window: 200,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $1.20 per million input tokens; $4.00 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5-turbo.md>)

### [GLM-5.1](<https://impossibl.com/zai/glm-5.1>)

GLM-5.1 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $1.40 per million input tokens. The advertised output rate is $4.40 per million output tokens.

- API identifier: `zai/glm-5.1`
- Creator: Z.AI; model type: Text generation.
- Context window: 200,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $1.40 per million input tokens; $4.40 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.1.md>)

### [GLM-5.2](<https://impossibl.com/zai/glm-5.2>)

GLM-5.2 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.40 per million input tokens. The advertised output rate is $4.40 per million output tokens.

- API identifier: `zai/glm-5.2`
- Creator: Z.AI; model type: Text generation.
- Context window: 1,000,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $1.40 per million input tokens; $4.40 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.2.md>)

### [GLM-5.2 Fast](<https://impossibl.com/zai/glm-5.2-fast>)

GLM-5.2 Fast is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 1,040,000 tokens. The advertised input rate is $2.10 per million input tokens. The advertised output rate is $6.60 per million output tokens.

- API identifier: `zai/glm-5.2-fast`
- Creator: Z.AI; model type: Text generation.
- Context window: 1,040,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $2.10 per million input tokens; $6.60 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.2-fast.md>)

### [GLM-5.3](<https://impossibl.com/zai/glm-5.3>)

GLM-5.3 is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.40 per million input tokens. The advertised output rate is $4.40 per million output tokens.

- API identifier: `zai/glm-5.3`
- Creator: Z.AI; model type: Text generation.
- Context window: 1,000,000 tokens; tool calling: Not published.
- Inputs: text; outputs: text.
- Base API pricing (USD): $1.40 per million input tokens; $4.40 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.3.md>)

### [GLM-5.3-Flash](<https://impossibl.com/zai/glm-5.3-flash>)

GLM-5.3-Flash is a text generation model from Z.AI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $0.15 per million input tokens. The advertised output rate is $0.50 per million output tokens.

- API identifier: `zai/glm-5.3-flash`
- Creator: Z.AI; model type: Text generation.
- Context window: 1,000,000 tokens; tool calling: Not published.
- Inputs: text, image; outputs: text.
- Base API pricing (USD): $0.15 per million input tokens; $0.50 per million output tokens.
- [Complete model facts, cache rates, context tiers, and FAQs as Markdown](<https://impossibl.com/zai/glm-5.3-flash.md>)

## Compare Z.AI models

- [GLM-4.5 vs GLM-4.5 Air](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.5-air>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.5-air.md>)
- [GLM-4.5 vs GLM-4.6](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.6>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.6.md>)
- [GLM-4.5 vs GLM-4.7](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.7>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-4.7.md>)
- [GLM-4.5 vs GLM-5](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5.md>)
- [GLM-4.5 vs GLM-5 Turbo](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5-turbo>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5-turbo.md>)
- [GLM-4.5 vs GLM-5.1](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5.1>); [Markdown comparison](<https://impossibl.com/compare/zai/glm-4.5/zai/glm-5.1.md>)

## Frequently asked questions

### Which Z.AI models are available through Impossibl?

The directory lists 11 models from Z.AI available through the Impossibl API, including GLM-4.5, GLM-4.5 Air, and GLM-4.6. Open each model page for its API identifier, capabilities, and current pricing.

### How much do Z.AI models cost?

Z.AI model prices vary by model and usage. All rates below are published base API rates in USD. For token-priced models, published input rates start at $0.15 per million input tokens. Published output rates start at $0.50 per million output tokens. Input and output minima may refer to different models. Individual model pages include published cache prices and billing units. Applicable fees and workspace-specific pricing can affect the amount paid.

### What context windows do Z.AI models support?

Among Z.AI models with a published limit on Impossibl, the largest context window is 1,040,000 tokens, listed for GLM-5.2 Fast. Context limits vary by model and are separate from maximum output limits.

### What inputs and capabilities do Z.AI models support?

Available model types include text generation. Published input support includes image and text; support varies by model. Tool-calling support is unspecified for 11 models.

### How do I use Z.AI models through an API?

Use the exact model identifier from the model page with the Impossibl API. For example, select zai/glm-4.5 with /v1/chat/completions. Endpoint compatibility depends on the selected model. The API quickstart explains how to create an API key and send a request.

## Sources and related links

Prices, capabilities, limits, and availability describe the public Impossibl API offering. An unpublished fact is unknown; a published zero price is zero. Compare matching billing units and check context tiers before estimating costs.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Model directory as Markdown](<https://impossibl.com/models.md>)
- [API quickstart](<https://impossibl.com/docs/agent-quickstart>)
- [Model documentation](<https://impossibl.com/docs/models>)