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Your Model Upgrade Is a Breaking Change: Build Contract Tests for LLM Providers in TypeScript

This story is from 2026-10-03. It is preserved in the archive; the latest stories are on the live feed.

Most code that calls a model has one line that looks harmless. model : " claude-sonnet-5 " Changing it feels like a config change. But that string is part of an API contract. And this month, the contracts changed. On September 17, Google released Antigravity Agent 09-2026 . If you run tools locally…

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  1. 2026-10-03 21:54 · DEV Community — AI
    Your Model Upgrade Is a Breaking Change: Build Contract Tests for LLM Providers in TypeScript

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