# GLM 5.3 Prime

> GLM 5.3 Prime is a language model from Zhipu AI (Z.ai), released on 23 Sept 2026. It accepts text and generates text, with a 1M-token context window and up to 131K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2.80 per million input tokens and $8.80 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/glm-5-3-prime
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Zhipu AI (Z.ai)
- **Release date:** 23 Sept 2026 (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Status:** Generally available
- **Context window:** 1M (1,000,000 tokens) (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Max output:** 131K tokens (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Input:** Text (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Reasoning mode:** Yes (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Tool calling:** Yes (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)
- **Structured output:** No (source: OpenRouter, https://openrouter.ai/z-ai/glm-5.3-prime)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $2.80 | $8.80 | $0.56 | 1M |

## FAQ

### What is the context window of GLM 5.3 Prime?

GLM 5.3 Prime has a context window of 1,000,000 tokens (1M) and can generate up to 131,072 tokens in a single response, according to OpenRouter.

### How much does the GLM 5.3 Prime API cost?

GLM 5.3 Prime is listed from $2.80 per million input tokens and $8.80 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### When was GLM 5.3 Prime released?

Zhipu AI (Z.ai) released GLM 5.3 Prime on 23 Sept 2026, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GLM 5.3 Prime", https://www.aimodel.directory/models/glm-5-3-prime