---
title: "GLM 5.3 Flash"
description: "GLM 5.3 Flash by Z.ai: 1.02M context. Compare provider prices and applicable pricing conditions on the model page. Pay as you go."
canonical: https://pirouter.ai/models/z-ai/glm-5.3-flash
last-updated: 2026-10-15
---

# GLM 5.3 Flash

> GLM 5.3 Flash by Z.ai: 1.02M context. Compare provider prices and applicable pricing conditions on the model page. Pay as you go.

GLM 5.3 Flash is the first natively multimodal model of the GLM 5 family, built on a low-cost architecture. It takes text and image input with a 1M-token context, up to 128K output and tool calling, and always reasons before it answers.

## At a glance

- Model ID: `z-ai/glm-5.3-flash`
- Also accepted as: `glm-5-3-flash`, `glm-5.3-flash`
- Vendor: Z.ai
- Category: text
- Openness: Proprietary
- Model page: https://docs.z.ai/
- Context: 1,024,000 tokens
- Max output: 128,000 tokens
- Added to pirouter: 2026-08-28
- Status: Available

## Pricing (USD per 1M tokens)

|  | Input | Output | Cache read | Reasoning |
|---|---|---|---|---|
| Standard | $0.105 ~~$0.15~~ | $0.35 ~~$0.5~~ | $0.021 ~~$0.03~~ | $0.35 ~~$0.5~~ |

Up to 30% off for a limited time · Ends 2026-12-31 23:59 HKT.

## Capabilities

- Function calling
- Tool choice
- Parallel tool calls
- Logprobs
- Reasoning
- Prompt caching
- System messages
- Streaming
- Vision
- PDF input

## Reasoning effort

- max, xhigh, high, medium, low (default: medium)

## How to call it

One pirouter API key works with every API format below; create it in the console. Use one of these formats; formats not listed are not available for this model.

- API key: https://app.pirouter.ai/sign-in

### OpenAI Responses

- Endpoint: `POST /v1/responses` on https://api.pirouter.ai
- Auth: `Authorization: Bearer <key>`
- SDK base URL: https://api.pirouter.ai/v1
- Reference: https://pirouter.ai/docs/api/responses

```bash
curl https://api.pirouter.ai/v1/responses \
  -H "Authorization: Bearer $PIROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flash",
    "input": "Hello!"
  }'
```

### OpenAI Chat

- Endpoint: `POST /v1/chat/completions` on https://api.pirouter.ai
- Auth: `Authorization: Bearer <key>`
- SDK base URL: https://api.pirouter.ai/v1
- Reference: https://pirouter.ai/docs/api/chat-completions

```bash
curl https://api.pirouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $PIROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flash",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'
```

### Anthropic Messages

- Endpoint: `POST /v1/messages` on https://api.pirouter.ai
- Auth: `x-api-key: <key>`
- SDK base URL: https://api.pirouter.ai
- Reference: https://pirouter.ai/docs/api/messages

```bash
curl https://api.pirouter.ai/v1/messages \
  -H "x-api-key: $PIROUTER_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flash",
    "max_tokens": 1024,
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'
```

## Providers

One row per provider; pirouter sends each request to a healthy one.

| Provider | API format | Context | Max output | Input /M | Output /M | Trains on your data | Data retention |
|---|---|---|---|---|---|---|---|
| siliconflow | openai, anthropic | 1,024,000 | 128,000 | $0.105 ~~$0.15~~ | $0.35 ~~$0.5~~ | Not disclosed | Not disclosed |
| volcengine | openai, anthropic | 1,024,000 | 128,000 | $0.135 ~~$0.15~~ | $0.45 ~~$0.5~~ | No | Not disclosed |

## Rankings

Where this model ranks on each blind-vote leaderboard, listing the boards where it makes the top 100. Open a board for the full ranking.

| Board | Rank | Score |
|---|---|---|
| [Overall](https://pirouter.ai/rankings/overall) | #32 / 385 | 1474 |
| [Coding](https://pirouter.ai/rankings/coding) | #22 / 380 | 1523 |
| [Math](https://pirouter.ai/rankings/math) | #13 / 371 | 1500 |
| [Creative writing](https://pirouter.ai/rankings/creative) | #55 / 383 | 1435 |
| [Instruction following](https://pirouter.ai/rankings/instruct) | #26 / 385 | 1473 |
| [Multi-turn](https://pirouter.ai/rankings/multiturn) | #40 / 383 | 1475 |
| [Long prompts](https://pirouter.ai/rankings/longctx) | #38 / 363 | 1479 |
| [Chinese](https://pirouter.ai/rankings/chinese) | #13 / 362 | 1532 |
| [Web dev](https://pirouter.ai/rankings/webdev) | #22 / 121 | 1616 |
| [Agents](https://pirouter.ai/rankings/agent) | #27 / 44 | -0.3 pp |
| [Vision](https://pirouter.ai/rankings/vision) | #19 / 144 | 1281 |

Data: [LMArena leaderboard dataset](https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset), used under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) · Updated 2026-10-01

## Supported parameters

`tools`, `tool_choice`, `parallel_tool_calls`, `max_tokens`, `max_completion_tokens`, `temperature`, `top_p`, `seed`, `stop`, `logprobs`, `top_logprobs`, `reasoning`, `include_reasoning`, `stream`

## Links

- HTML: https://pirouter.ai/models/z-ai/glm-5.3-flash
- JSON: https://pirouter.ai/api/models/z-ai/glm-5.3-flash
- Providers JSON: https://api.pirouter.ai/v1/models/z-ai/glm-5.3-flash/endpoints
- Leaderboard ranks (JSON): https://pirouter.ai/api/models/z-ai/glm-5.3-flash/rankings
- Catalog: https://pirouter.ai/models
- Quickstart: https://pirouter.ai/docs/quickstart
- How routing works: https://pirouter.ai/docs/routing
- llms.txt: https://pirouter.ai/llms.txt

---

HTML version: https://pirouter.ai/models/z-ai/glm-5.3-flash · Machine-readable index: https://pirouter.ai/llms.txt