ZKasino's smart contracts have been audited by CertiK. The report was delivered on 20 January 2023 and can be read on: https://www.certik.com/projects/zkasino#audit. The audited contracts are the contracts used at mainnet launch on chains with the Chainlink VRF. A direct link to download the PDF can be found here: https://certik-public-assets.s3.amazonaws.com/CertiK-Audit-for-ZKasino-v3.pdf
ZKasino's smart contracts have undergone a pre-audit through ChatGPT by OpenAI. ChatGPT reviewed all the contracts, explained how they work and looked for security issues. The report can be read in the Medium article.