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Z.ai's developer release notes log GLM-5.3-Flash on 26 August 2026, INSIDE[4] reports Z.ai's own X post that day naming it as the model that had circulated anonymously as "Ox Alpha" from 20 August, with weights published the same day, and DataNorth[5] says it was "released on 26 August 2026". Epoch AI lists 20 August, which is the anonymous OpenRouter debut, not the maker's release.Z.ai releases GLM-5.3-Flash, a 320B-parameter (18B active) natively multimodal open-weight model on a newly trained base that it says beats GLM-5.2 at one-tenth of the price, listed at $0.15 per million input tokens.
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