# GLM-5.3 Flash

> GLM-5.3 Flash — lightweight GLM-5.3 tuned for speed and ultra-low cost.

Canonical: https://routemux.com/zhipu/glm-5.3-flash
Provider: Zhipu

## Key facts

| Field | Value |
| --- | --- |
| Model ID | zhipu/glm-5.3-flash |
| Official model ID | glm-5.3-flash |
| Context window | 1M |
| Max output | 128K |
| Input modalities | text |
| Output modalities | text |
| Capabilities | Reasoning, Tool Calling, Coding, Cache |
| Upstream release | 2026-08-26 |
| Availability | available |

## Pricing

- RouteMux input: $0.03 per 1M tokens
- RouteMux output: $0.1 per 1M tokens
- Official input: $0.15 per 1M tokens
- Official output: $0.5 per 1M tokens
- Cache read: $0.006 per 1M tokens
- Saving vs official: 80%
- Official price source: opencode_x0.20, verified 2026-08-30

Billing is prepaid wallet, charged per successful request only.

## API access

Base URL: https://api.routemux.com

Supported protocols:

- openai_chat
- openai_responses
- anthropic_messages

## Other variants in this family

- GLM-5.3 (`zhipu/glm-5.3`)