You're right that the Databricks blog post mentions the new Claude 4 models, including Opus 4 and Sonnet 4. These models have been announced and are in the process of rolling out to Databricks workspaces. However, as of now, only Claude 3.7 Sonnet is visible in Model Serving and the Playground in most environments.
The Claude 4 models should become available soon, as Databricks is gradually rolling them out. For the most up-to-date list of supported models, please refer to the official documentation here: Databricks Supported Foundation Models
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I hope this information helps.
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