# GLM 5.3 Prime

> GLM 5.3 Prime is the top reasoning tier of Z.ai's GLM 5.3 line, above the Flash and FlashX cuts, with a 1M-token context window. It sits alongside z-ai/glm-5.3 and z-ai/glm-5.3-flash as a separately priced official variant rather than a packaging of them, so it keeps its own listing row.

**ID**: `z-ai/glm-5.3-prime`  
**Creator**: Zhipu AI  
**Category**: text  
**Context**: 1M tokens  
**Input**: $2.80/M  
**Output**: $8.80/M  
**Released**: 2026-09-23  
**Web page**: https://anyrouter.dev/model/z-ai/glm-5.3-prime

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: chat, streaming, function-calling, reasoning

**Supported parameters**: frequency_penalty, include_reasoning, logprobs, max_tokens, presence_penalty, reasoning, reasoning_effort, response_format, seed, stop, temperature, tool_choice, tools, top_k, top_logprobs, top_p

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "z-ai/glm-5.3-prime",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| openrouter-byok | $0 | $0 |

## Source

- Upstream docs: https://openrouter.ai/z-ai/glm-5.3-prime