Last refreshed 2026-08-26. Next refresh: weekly.
Why use GLM-5.3-Flash on OpenRouter?
OpenRouter offers GLM-5.3-Flash with pay-as-you-go pricing at $0.09/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare GLM-5.3-Flash across 2 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: z-ai/glm-5.3-flashz-ai/glm-5.3-flashRequest example
z-ai/glm-5.3-flash.Gotchas
- Use provider model ID "z-ai/glm-5.3-flash", not the LLMReference slug "glm-5.3-flash".
Compare GLM-5.3-Flash Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Z.ai | $0.07 | $0.25 |
| OpenRouter | $0.09 | $0.30 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $0.09 |
| Output tokens | $0.30 |
Capabilities
About GLM-5.3-Flash
GLM-5.3-Flash is Z.ai's first native multimodal model in the GLM-5 series. It is a 320B-total / 18B-active Mixture-of-Experts model with a 1M-token context window and 131,072 max output tokens, supporting image, video, and file input plus function calling, tool use, structured outputs, reasoning, and prompt caching. MIT open weights are ungated on Hugging Face at zai-org/GLM-5.3-Flash. Official API model ID: glm-5.3-flash. The same model was previously tested anonymously as ox-alpha; that name is not a separate catalog slug.