# Z.ai — GLM-5.3

- Company: Z.ai (z.ai)
- Announced: 2026-08-18T00:00:00+00:00
- Category: model-update
- Subject: GLM
- Models affected: GLM-5.3, GLM-5.2, Mythos 5
- Source: https://docs.z.ai/release-notes/new-released#2026-08-18
- Record: https://forck.live/items/4446-glm-5-3

Z.ai releases GLM-5.3, an update to its model series, with improved coding capabilities (50% gain over GLM-5.2 on Z.ai Code Bench) and emergent cybersecurity capabilities matching Mythos 5 in white-box code review and vulnerability discovery (identified 2,436 vulnerabilities on real-world targets).

## Evidence

Verbatim from https://docs.z.ai/release-notes/new-released#2026-08-18:

> GLM-5.3 delivers a significant improvement in coding capabilities, achieving a 50% gain over GLM-5.2 on Z.ai Code Bench and reaching state-of-the-art (SOTA) performance among open-source models on public benchmarks, including Terminal Bench 3.0.

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Record: https://forck.live/items/4446-glm-5-3
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