# GLM-4.5-Flash

> GLM-4.5-Flash is an open-weight language model from Zhipu AI (Z.ai), released on 28 Jul 2025. It accepts text and generates text, with a 131K-token context window and up to 98K output tokens per response.

Source page: https://www.aimodel.directory/models/glm-4-5-flash
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Zhipu AI (Z.ai)
- **Release date:** 28 Jul 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Weights:** Open weights (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Context window:** 131K (131,072 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Max output:** 98K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Knowledge cutoff:** Apr 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/zai/models/glm-4.5-flash.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Z.ai API | Free | Free | Free | 131K |

## FAQ

### What is the context window of GLM-4.5-Flash?

GLM-4.5-Flash has a context window of 131,072 tokens (131K) and can generate up to 98,304 tokens in a single response, according to models.dev.

### Is GLM-4.5-Flash open source?

GLM-4.5-Flash is an open-weight model. Check the license terms before commercial use.

### When was GLM-4.5-Flash released?

Zhipu AI (Z.ai) released GLM-4.5-Flash on 28 Jul 2025, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GLM-4.5-Flash", https://www.aimodel.directory/models/glm-4-5-flash