GPT-6 Astra tool calls fail on Chat Completions; Responses API fixes them in Spring AI
therealdanvega · x · 2026-11-04
Spring AI developer Dan Vega shares a debugging habit: before rewriting a failing tool, check the model and endpoint pairing together. In his Spring AI 2.1 example, GPT-6 Astra tool calls fail on the Chat Completions API, but switching to the Responses API makes the identical request work — with zero changes to the Java code.
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