# Verify GLM 5.3 Flash Endpoints

Check that an endpoint selling GLM 5.3 Flash really serves it. A test compares the endpoint's answers with answers collected from Z.AI, through OpenRouter pinned to Z.AI.

- **Official Provider:** Z.AI, through OpenRouter pinned to Z.AI
- **Reference Answers:** 400
- **Declared Precision:** fp8
- **Official Release:** fp8 e4m3, 128x128 blocks
- **Checks:** Identity · Competence · Refusals (9 probes)
- **Reference Data Updated:** 2026-10-16

## How Well a Test Works

| Size | Requests | Genuine Confirmed | Wrongly Flagged | Substitutes Caught |
|---|---|---|---|---|
| Standard | 80 | 99.5% | 0.5% | 100.0% |
| Thorough | 160 | 99.5% | 0.5% | 100.0% |

Simulated from the reference answers. A substitute that isn't caught ends inconclusive: it is never confirmed as this model.

## Guides

- [How the Identity Check Works](https://llm-id.sh/docs/identity)
- [Testing an Endpoint](https://llm-id.sh/docs/testing-an-endpoint)
- [Competence Check](https://llm-id.sh/docs/competence)
- [Refusal Check](https://llm-id.sh/docs/refusals)
- [Limits](https://llm-id.sh/docs/limits)

Test a GLM 5.3 Flash endpoint: https://llm-id.sh/app#new

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From llm-id.sh: https://llm-id.sh/models/glm-5.3-flash