17 Items to Check Before Upgrading to PostgreSQL 19—The One pg_upgrade --check Misses, and Inspection SQL (Measured on 18.6 and 19beta4)

The release notes for PostgreSQL 19 (scheduled for official release in October 2026) contain a section titled "Migration to ...
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How to fix Unsupported model version v4 in AI SDK 6—reverting to ai-v6, and empirical measurements of 45 combinations across 5 providers (Docker)

Conclusion The specification version of models accepted by 'ai' is determined by the major version of 'ai'. Models with specification v4, returned by the latest versions of providers (openai, ...