Streaming Parsers, Not JSON, Are What Break During an LLM API Migration
A migration diary argues that the streaming layer, rather than the non-streaming JSON responses, is where API cutovers typically fail silently. Providers that claim OpenAI compatibility can still differ on where usage data appears, whether a [DONE] marker is sent, and how tool-call arguments are split across chunks. The author recommends recording raw server-sent event bytes as fixtures, covering at least four shapes including plain text, tool calls, stop sequences, and errors returned after a 200 status. A state-machine normalizer is proposed that keys tool-call fragments by index and ignores comments and unknown fields. The cutover should then be gated on structural equality of normalized events rather than a one-off manual check.
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